Jens Eisert @jenseisert Twitter profile | Pikagi

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Jens Eisert

@jenseisert

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Scientist, professor of quantum physics at @FU_Berlin and affiliated with @HZBde and @FraunhoferHHI . @ERC_Research fellow.

Berlin, Deutschland

https://t.co/paCIuK4TvM

Joined October 2014

Don't wanna be here? Send us removal request.

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@jenseisert

Jens Eisert

8 months

We are currently offering several multi-year postdoctoral research positions to highly motivated and well-qualified researchers who intend to enhance their career in #quantuminformation science or in quantum #manybodyphysics . The positions on the E13 and E14 level are funded by

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@jenseisert

Jens Eisert

2 months

This is what I call an interesting LaTeX error.

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@jenseisert

Jens Eisert

2 years

My bet for the @NobelPrize in Physics this year: Anton Zeilinger and Alain Aspect for quantum foundations (in particular experiments to Bell's theorem).

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@jenseisert

Jens Eisert

2 years

Our early xmas present: We prove a super-polynomial #quantumadvantage of fault tolerant #quantumcomputers for combinatorial #optimization .

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Jens Eisert

2 years

I am humbled to have received an @ERC_Research #AdvancedGrant , the third #ERC grant for me, including one when the scheme was still called #EURYI that kickstarted my own career.

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@jenseisert

Jens Eisert

1 month

@hey_madni I dream of a company that comes on stage and says, hi there, we will now present the iPhone 16. It has absolutely no new features, but we have worked very hard to debug the old ones. This is a product I would want to buy. What do you think, @Apple ?

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Jens Eisert

2 years

I am astounded that basically all scientific meetings have switched from all electronic to all on-site. I had assumed that people would experiment more with new formats, to identify ways of bringing the best of both worlds together.

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@jenseisert

Jens Eisert

1 year

Here my five bets for the @NobelPrize in physics: 1. Bennett and @PeterShor1 for quantum information. 2. Hasan for Weyl semimetals. 3. Aharanov and Berry for the named effects. 4. Jarillo-Herrero for twisted graphene. 5. Zoller and Cirac for quantum engineering.

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Jens Eisert

2 years

The exploitation of #symmetry is much at home in theoretical physics, specifically in quantum many-body theory. Here, we explore how symmetry can be made use of in variational #quantummachinelearning , where symmetries can also enter on the data level.

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Jens Eisert

3 years

Come work with us! We offer several attractive multi-year #postdocposition |s in #quantuminformationtheory , on topics ranging from abstract #mathematical themes to questions of hardware #implementation , in an open and stimulating discussion climate.

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Jens Eisert

5 years

One thing I am admittedly proud of is that already 20 of our past group members are now in academic group leader positions or permanently employed in the #quantum industry. Responsibly overlooking the #career development of researchers is crucial.

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Jens Eisert

2 years

Detection of very weak forces and precise measurement of time are two of the many applications of #quantummetrology . In this work, we introduce and study fundamental trade-offs and uncertainty relations:

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Jens Eisert

3 years

I vividly remember the first @arxiv submission, how excited I was. It feels like yesterday. Interestingly - and maybe strangely - this excitement has not changed with each new submission. But time flies, now those submissions have collected 30.000 citations on @googlescholar_ .

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Jens Eisert

3 years

Several interesting and natural problems in #quantuminformationtheory , #manybodyphysics , and #machinelearning turn out to be #undecidable : For those (like the halting problem), it is impossible to devise an algorithm that always leads to a correct yes-or-no answer. A thread.

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Jens Eisert

3 years

Quantum states that are less complex are more resourceful in notions of #quantumcomputing than those that are complex. In many-body physics and #holography notions of #complexity feature strongly. Can one formulate a #resourcetheory of #uncomplexity ?

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Jens Eisert

2 years

Noise is for good reasons seen as the main antagonist to #quantumcomputing . Here, we provide evidence and prove that saddle points can be avoided in #variationalquantumalgorithms by exploiting stochasticity: The right kind of #noise can be helpful.

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Jens Eisert

6 months

Typical thermalization of low-entanglement states Proving #thermalization from the unitary evolution of a closed quantum system is one of the oldest questions that is still nowadays only partially resolved. Several efforts have led to various

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Jens Eisert

5 years

Happy to win a @GoogleAI NISQ award for 2019 and about the fruitful and fun collaboration.

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Jens Eisert

3 months

Unravelling quantum dynamics using flow equations. Combining flow equations with scrambling techniques and error bounds, we present a new way to address the classical simulation of quantum dynamics for intermediate times.

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Unravelling quantum dynamics using flow equations

Nature Physics - The complexity of a many-body quantum state grows exponentially with system size, hindering numerical studies. A unitary flow-based method now enables accurate estimates of...

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Jens Eisert

11 months

I am honored and humbled to be included in this list of the "100 most important minds in Berlin science 2023" by @Tagesspiegel , the leading newspaper of the state of Berlin, with research on #quantumcomputers and #complexquantumsystems .

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Jens Eisert

3 years

A proof of the Brown-Susskind-conjecture: The #complexity of a random quantum circuit grows linearly in the depth of the circuit, until a depth exponential in the system size. We discuss the proof and hint at applications in #holography .

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Jens Eisert

2 years

My warmest possible congratulations, Alain Aspect, Anton Zeilinger, and John Clauser, for winning this - much deserved- @NobelPrize in Physics. You have shown the world that quantum foundations and technology go hand in hand. #NobelPrize

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@jenseisert

Jens Eisert

2 years

My bet for the @NobelPrize in Physics this year: Anton Zeilinger and Alain Aspect for quantum foundations (in particular experiments to Bell's theorem).

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Jens Eisert

2 years

The biggest #outreach challenge to date: Explaining #quantumcomputers to third graders in elementary school. I have rarely received so many clever questions.

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Jens Eisert

2 years

The biggest advantage #quantumcomputers can contribute to algorithms for #machinelearning may be in the #training of large-scale #classical models.

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Jens Eisert

9 months

Hamiltonian truncation tensor networks for quantum field theories Understanding the equilibrium properties and #outofequilibrium dynamics of #quantumfieldtheories are key aspects of fundamental problems in theoretical particle physics and cosmology.

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Jens Eisert

2 years

After years of work, we are very happy to see our manuscript out that shows how fault-tolerant logical operations in #quantumcomputing based on #topologically -ordered phases of matter can be usefully interpreted as instances of #anyoncondensation .

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Jens Eisert

2 months

Full classification of Pauli Lie algebras We provide a comprehensive classification of Lie algebras generated by an arbitrary set of Pauli operators.

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Jens Eisert

3 years

I have curated my YouTube channel, with a few new talks and lectures as well as several exciting guest talks from seminars. The resources of talks seem to be the one good thing coming out of Covid times. Still I am very happy to see things opening up.

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Jens Eisert

10 months

This experiment with up to 280 physical qubits, simulating up to 48 logical qubits, seems to be the #quantumerrorcorrection breakthrough of the year. This is an impressive achievement, and it comes earlier than I thought it would be possible.

@preskill

John Preskill

10 months

Great talk by Vladan Vuletic. #Q2B23SV !

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Jens Eisert

2 years

“Quantum physics from A(nton) to Z(eiliger).” #NobelPrize

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Jens Eisert

2 years

I realize that today's submission has been my 300 contribution to the @arxiv . I vividly remember my very first contribution on the #negativity , a quantity that later became a much used #entanglementmeasure . It feels like yesterday.

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Jens Eisert

8 months

Teaching measurement-based #quantumcomputing for the first time in a course on #quantuminformationtheory is a fun experience.

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Jens Eisert

1 year

Happy to be named among the top 100 researchers of #Berlin , in a survey to be published by the @Tagesspiegel . Berlin offers an excellent academic landscape in a welcoming environment. (For me, primarily the @FU_Berlin of the @BerlinUAlliance , but also @FraunhoferHHI and @HZBde ).

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Jens Eisert

4 months

Time flies. I cannot sense that I am even a bit less excited about quantum physics than at the time of the first arXiv submission. And still some of the framework conditions do change - I have to get up early, e.g., to have time for solid thinking. Google Scholar surprises me

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Jens Eisert

2 years

#Quantumerrormitigation is a key method to combat unavoidable errors in near-term #quantumcomputing by classically postprocessing outcomes of quantum circuits. Here, we show exponentially tighter tighter bounds on #limitations of quantum error mitigation.

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Jens Eisert

5 years

The chancellor of Germany shows up at the project event of #Planck on near-term #quantummachinelearning .

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Jens Eisert

3 years

I just gave the second class of a course on #quantuminformationtheory in real-life, actually, in flesh and blood. I had forgotten how much fun teaching is.

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Jens Eisert

2 years

This piece of work is particularly close to my heart. It presents a scalable and highly experimentally friendly method of #Hamiltonianlearning , by combining ideas of #tensornetworks and #machinelearning . It has been in the making for over two years.

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Jens Eisert

1 year

The #NobelPrize2023 in physics goes to Pierre Agostini, Ferenc Krausz and Anne L’Huillier for attosecond physics.

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Jens Eisert

2 years

#Quantumthermodynamics is aimed at grasping thermodynamic laws as they apply to thermal machines operating in the deep quantum regime, a regime in which coherences and entanglement are expected to matter.

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Jens Eisert

5 years

Alva on her first political mission: Selling home made cake at @FU_Berlin for the firefighters saving Koala bears from the fires in Australia. I could not stop her.

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@jenseisert

Jens Eisert

3 years

We are excited about a new research network on near-term #quantumdevices and #quantumcomputing within the @BerlinUAlliance of @FU_Berlin , @HumboldtUni , @TUBerlin and the @ChariteBerlin .

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Jens Eisert

1 year

Quantum random sampling is the leading proposal for demonstrating a computational #advantage of #quantumcomputers over classical computers, also referred to as " #quantumsupremacy ". We provide a comprehensive #review of the state of affairs.

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@jenseisert

Jens Eisert

6 months

Preparing a talk in honour of one of the greatest figures in mathematical physics. He has been very influential for me.

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@jenseisert

Jens Eisert

2 years

Recent years have enjoyed an enormous interest in the question to what extent realistic #quantumdevices have the potential to outperform classical computers. In our review, we provide a comprehensive overview over #quantumrandomsampling schemes.

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Jens Eisert

8 months

A short article about our #quantum activities in #Berlin .

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Jens Eisert

3 years

Are the output distributions of #quantumcircuits actually #learnable ? We systematically look at this question, within two different oracle models, presenting a positive and a negative result.

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Jens Eisert

3 years

Oh, nice, thank you, @APSphysics . It is good to see that such services are appreciated.

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@jenseisert

Jens Eisert

7 months

I find science communication important. 1. To start with, much of what we do is publicly funded, so it seems just fair to give some of it back to society and to explain what we work on. 2. Then, it does seem important to avoid misunderstandings of what science is all about.

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Jens Eisert

4 months

It's a kind of magic. We introduce ensembles of quantum states arising in quantum computing and many-body theory that, despite featuring low nonstabilizerness and hence “magic”, are actually computationally indistinguishable from those with high

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@jenseisert

Jens Eisert

1 year

A little break in paradise.

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@jenseisert

Jens Eisert

9 months

Towards provably efficient quantum algorithms for large-scale machine-learning models

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@jenseisert

Jens Eisert

11 months

A purrfect match: Bosonic cats and QLDPC codes

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Jens Eisert

2 years

What an honor that our team, with Marcel Hinsche and Marios Ioannou in the lead, has won the best poster award at #QIP2023 .

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@jenseisert

Jens Eisert

3 years

How can some conformal theories be captured by tensor networks on regular hyperbolic geometries? This work shows how. Their parent Hamiltonians exhibit multi-scale quasiperiodic symmetries.

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@jenseisert

Jens Eisert

7 months

Complexity-constrained quantum thermodynamics Quantum complexity measures the difficulty of realizing a quantum process, such as preparing a state or implementing a unitary. We present an approach to quantifying the #thermodynamic resources required to

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@jenseisert

Jens Eisert

8 months

This is Konrad Zuse’s Z1 machine, the first modern computer, built in 1938. It is for supercomputing what present-day quantum devices are for the #quantumcomputers of tomorrow.

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@jenseisert

Jens Eisert

5 years

Quantum stochastic gradient descent improves the performance of hybrid classical-quantum #optimization in #nearterm #quantumcomputers . In a field largely driven by heuristics, it seems worthwhile to try to contribute rigorous statements. #quantumsoftware

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@jenseisert

Jens Eisert

3 years

My @YouTube channel keeps growing and growing with excellent group guest talks (and some own ones). Even when the pandemic is now hopefully slowing down, I will keep up that type of dissemination, which I think is a good thing.

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@jenseisert

Jens Eisert

3 years

Recent years have enjoyed an increased interest in notions of #holographic #tensornetworks and #quantumerrorcorrection . This article provides a review.

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Jens Eisert

2 years

At his PhD viva, @haferjonas blows everybody away with his insights on the growth of complexity. Well done, Jonas, so happy for and proud of you.

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@jenseisert

Jens Eisert

3 years

My short publication on the connection between #entanglingpower and quantum circuit #complexity is out in the @PhysRevLett .

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@jenseisert

Jens Eisert

2 years

A goodbye selfie with the great @quekpottheories , but only for now, there is more to come.

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@jenseisert

Jens Eisert

2 years

@WilliamWimley In physics, all relevant work has been put onto the @arxiv since about 1994. For this reason, the entire open access debate is completely pointless in physics since all material has been openly accessible for almost a third of a century. Answer: Very useful.

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@jenseisert

Jens Eisert

2 years

Full house at the @FU_Berlin lecture on #quantuminformationtheory .

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@jenseisert

Jens Eisert

4 years

The #NobelPrize in physics goes to Roger Penrose, Reinhard Genzel and Andrea Ghez for black hole physics. Warmest congratulations.

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@jenseisert

Jens Eisert

3 years

First snow.

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@jenseisert

Jens Eisert

2 years

After years of work, we are now releasing a paper (and a software package) able to simulate #quantumrepeaters and #quantumnetworks in a versatile fashion, down to respecting nitty gritty parameter details for physical implementations.

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@jenseisert

Jens Eisert

7 months

Welcome, Canada, for a workshop on “Fundamental Limitations to Quantum Computation”.

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@jenseisert

Jens Eisert

3 months

Single-shot quantum machine learning

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@jenseisert

Jens Eisert

6 months

The mathematical physics of near-term quantum computing, held at the #DPGSpring today.

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Jens Eisert

2 months

Exponentially tighter bounds on limitations of quantum error mitigation We show that while quantum error mitigation is a wonderful idea able to combat noise in near-term quantum devices, already at log-log-depth, there are obstructions in the worst case.

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@jenseisert

Jens Eisert

3 years

The two-dimensional classical Heisenberg model is one of the most paradigmatic models of classical #statisticalphysics . And yet, its phase diagram has never been unambiguously settled. We shed new light on this question by means of #tensornetworks .

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@jenseisert

Jens Eisert

9 months

Robustly learning the Hamiltonian dynamics of a superconducting quantum processor

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@jenseisert

Jens Eisert

3 years

At the dinner speech, the ambitious student of @RobertHuangHY , John @preskill , emphasizes how young the field of #quantuminformation processing still is.

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Jens Eisert

2 years

A bit of #outreach , an article on #quantumcomputing in Berlin’s daily newspaper @Tagesspiegel (in German).

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Jens Eisert

5 months

The striking difficulty of continuous-variable quantum state tomography Spoiler: Continuous variable #quantumstatetomography is much more challenging concerning its sample complexity than expected.

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Jens Eisert

7 months

The funny life of a scientist. Yesterday, I was working for 22 minus two hours on @TQC_conference submissions. During the two hour break, I went to a local circus with the family. As a weird coincidence, among all people in the tent, I was picked by the clown to perform a

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@jenseisert

Jens Eisert

2 years

Overall, I think it is a great new development that both #academia and the #quantumindustry are pushing things forward. Both sides have something exciting to offer. I do think that it will matter for the years to come that industry and academia treat each other respectfully.

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Jens Eisert

4 years

Quantum versus classical learnability of distributions, featuring a generative modelling problem for which quantum learners exhibit a provable advantage over classical learning algorithms.

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@jenseisert

Jens Eisert

1 year

How can one think of a #quantumsimulation of #thermodynamics in an integrated quantum #photonic processor? Here is the result of our attempts.

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@jenseisert

Jens Eisert

7 months

Understanding quantum machine learning also requires rethinking generalization Happy to see this out in the @NatureComms .

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Understanding quantum machine learning also requires rethinking generalization

Nature Communications - Understanding machine learning models’ ability to extrapolate from training data to unseen data - known as generalisation - has recently undergone a paradigm shift,...

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@jenseisert

Jens Eisert

2 years

Fun on ice.

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Jens Eisert

3 years

Citation metrics are a possibly biased and sometimes misleading figure of merit. Still, something in me is happy to see that our review on quantum many-body systems out of equilibrium in @NaturePhysics has reached 1000 citations on #GoogleScholar .

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@jenseisert

Jens Eisert

5 months

Today, I gave a talk in honour of #ReinhardWerner , starting with how he was standing on the shoulders of giants with his early research in #MathematicalPhysics . I ended the talk with the point that is now us show are standing on the shoulders of a giant. Thanks, Reinhard, and

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Jens Eisert

11 months

Full house at the graduate course on #quantuminformationtheory held at the @FU_Berlin this fall.

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Jens Eisert

3 years

Hello quantum world: There will be #postdoc and #PhD positions coming along with this. If you would like to work in a fun and strong research team in #Berlin , please inquire at applicationsqmio @gmail .com. #quantum #opportunities #postdocjobs

@jenseisert

Jens Eisert

3 years

We are excited about a new research network on near-term #quantumdevices and #quantumcomputing within the @BerlinUAlliance of @FU_Berlin , @HumboldtUni , @TUBerlin and the @ChariteBerlin .

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Jens Eisert

5 months

Great insights by @ElisaBaumer of @IBMResearch on the role of mid-circuit measurements at #QuantumMatter2024 .

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Jens Eisert

2 years

10.000 followers? Thanks so very much for the interest. This is much appreciated. I see this as a scientific dissemination channel, but also as a source of fun and excitement.

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Jens Eisert

1 year

#Flowequation methods - equipped with scrambling transformations - may allow the dynamical #classicalsimulation of strongly correlated quantum systems for surprisingly long times.

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Jens Eisert

7 months

I am flattered to see 20.000 followers on this platform. Thanks so very much for the interest. This account has started out as a small log-book discussing what I find interesting in quantum science, spiced up by this and that thought and some pictures. And now this. Thanks again.

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@jenseisert

Jens Eisert

11 months

With @AndreasAtETH at the @Falling_Walls #ScienceSummit23 during the @BerlinSciWeek .

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Jens Eisert

2 years

An article about @PeterShor1 winning the breakthrough prize in fundamental physics.

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Peter Shor wins Breakthrough Prize in Fundamental Physics

MIT Professor Peter Shor has won the 2023 Breakthrough Prize in Fundamental Physics with three others for “foundational work in the field of quantum information.” In addition, Daniel A. Spielman PhD...

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@jenseisert

Jens Eisert

3 years

Work life balance 101: When you spend the late Friday night filling in ten pages of bureaucratic European Union forms on work life balance. 😉

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Jens Eisert

2 years

The #quantumerrorcorrection garden meetings are back.

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Jens Eisert

3 years

Happy new year.

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@jenseisert

Jens Eisert

4 months

Online learning of quantum processes Among recent insights into #learning quantum states, online learning and #shadowtomography procedures are notable for their ability to accurately predict expectation values even of #adaptively chosen observables.

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Jens Eisert

1 year

I do not think that IBM has lost any respect here. It is a well implemented impressive experiment on a problem that is a solid test case for showing a quantum advantage, and even the method development on quantum error mitigation is a big step forward.

@jaygambetta

Jay Gambetta

1 year

@marcotomamichel Marco, this is really disappointing to hear and I would really like to understand why we have lost respect. At no point did we claim quantum advantage, nor was it our motivation — which will be very clear if one reads the paper.

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Jens Eisert

3 months

A keynote talk to be given tomorrow at the " @IBMResearch #optimization working group" meeting at the @ZuseInstitute Institute Berlin.

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Jens Eisert

1 year

My heart and hopes are with my friends in #Israel . I sincerely hope they and their families are safe and sound after the attacks.

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