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#quantuminformation

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#Introduction
I work on quantum technologies for networks & sensing. Mostly playing with quantum optics & quantum information.
I work at the University of Geneva in Switzerland & previously studied at the University of Queensland in Australia.

I was the inaugural chair of the Strategic Research Agenda Work Group for the European Quantum Flagship initiative & founding Editor-in-Chief for the IOP journal: Quantum Science and Technology.

In #quantumInformation often implementation estimates arise by counting options available for each of a number of qubits.

For example, if each #qubit is in a definite state |0〉 or |1〉 then there are 2ᴸ such configurations for 𝐿 qubits. If we are able to at will apply 𝑋,𝑌 or 𝑍 operations to each qubit then there are 4ᴸ such operations.
(If you do something on some qubits and nada on others then it's still a distinct operation jointly, so there are 4, not 3, options for each qubit)

How much is that?

A quick upper bound can be obtained by taking 2³=8<10 .
So for example for 𝐿=9 qubits if we want to run a protocol starting from every single configuration of definite qubit states (eg process tomography) then we will have to run it no more than thousand 10³ times. And so quickly you get an idea about what is much and what is too much.

More general operations can be decomposed into 𝑋,𝑌 or 𝑍 (and nothing, so the identity). During my PhD I was working with Marcel Goihl who was running a lot of numerics for a #quantum model of insulation arising from disorder. We were looking for charges that would get stuck and thus not participate in conductance. For transport through 𝐿=9 qubits we'd have 4⁹=2¹⁸=10⁶ million contributions that we'd need to calculate.

For 𝐿=13 this becomes 2²⁶<10⁹ contributions.

Marcel got curious that this is quite many and how much energy his calculations used on an #hpc cluster. Running a typical idea check quickly amounted to the yearly budget of a statistical German person.

He now works at a CO2 offsetting company and before graduating wrote with Ryan Sweke the proposal to keep track of what's the #enviroment cost of our calculations in #physics

scientific-conduct.github.io

re-#introduction after moving instances

Hello mathstodon! 👋
We are a computational #quantum #physics group at the Freie Universität Berlin and the Dahlem Center for Complex Quantum Systems.
Our research interests are in the #QuantumControl of atoms, molecules and condensed matter systems with an #AMO like structure as well as #QuantumInformation processing.
We are using both #CoherentControl concepts and #OptimalControl theory, applying them to isolated as well as open quantum systems.
The development of optimal control methods is a major part of our work. A current emphasis is on control methods for open quantum systems.

We collaborate with research groups all over Europe (France, Spain, Switzerland), Israel and the US.

Thanks for having us, we are looking forward to sharing and discussing research updates!

Here's an #introduction of @frederikhahn as part of my agenda that #nice should be a characteristic demanded of academics.

In the past few years Freddy has been gently cracking his head on how to remove bottlenecks in a #quantumNetwork. He focused on relevant #quantum states and tweaked their parts like he tweaks parts in his bike to make it run seamlessly
arxiv.org/abs/1805.04559
(Local complementations interest me for #quantumCompiling: the unitary encoding the repetition code can be turned into a gate between any two qubits because one can distill Bell pairs out of #GHZ states.)

Rick came from Berlin to the #quantumInformation #workshop in #benasque by train. His tap water canister was half empty: he realized that meh whatev he can travel half Europe and not eat if the food is not what he wants provided he has water to last him even more than 24 hs.

Frederik is a scientist who leads by example, is sustainably concerned about the #climateCrisis but look at him shining. His #intermittentFasting skills allowed him to be chilled after a strainous long distance travel but I learn from him that being nice and chilled is a muscle we can all train.

His integrity at work reminds me that it's not impossible to keep our humanity first and also excell at research. I wish we had an equivalent of #citationMetrics for acts of kindness in academia.

These photos were taken on a Friday, on Monday that week he defended his thesis. In style, which is his style. For his #phd hat I'd add a phone charger, his daily cycling suffices to top up the battery. I don't know how to symbolize my thanks for having made my local science world wholesome, one #introvert thought at a time, but: thank you for caring, Dr Hahn!

interesting paper today on #arxiv

"A white paper for the 2023 nuclear physics long-range planning activity, emerging from the workshop "Quantum Information Science for U.S. Nuclear Physics Long Range Planning'', held in Santa Fe, New Mexico on January 31 - February 1, 2023"

🔗 arxiv.org/abs/2303.00113
#quantum #physics #QuantumInformation

arXiv.orgQuantum Information Science and Technology for Nuclear Physics. Input into U.S. Long-Range Planning, 2023In preparation for the 2023 NSAC Long Range Plan (LRP), members of the Nuclear Science community gathered to discuss the current state of, and plans for further leveraging opportunities in, QIST in NP research at the Quantum Information Science for U.S. Nuclear Physics Long Range Planning workshop, held in Santa Fe, New Mexico on January 31 - February 1, 2023. The workshop included 45 in-person participants and 53 remote attendees. The outcome of the workshop identified strategic plans and requirements for the next 5-10 years to advance quantum sensing and quantum simulations within NP, and to develop a diverse quantum-ready workforce. The plans include resolutions endorsed by the participants to address the compelling scientific opportunities at the intersections of NP and QIST. These endorsements are aligned with similar affirmations by the LRP Computational Nuclear Physics and AI/ML Workshop, the Nuclear Structure, Reactions, and Astrophysics LRP Town Hall, and the Fundamental Symmetries, Neutrons, and Neutrinos LRP Town Hall communities.

In case you are like me interested in #quantumcomputing #quantumcomputer #quantum #quantuminformation #qkd and similar topics, I have collected some links that maybe help you to find new contacts to follow.

Additions are welcome. Would like to see a growing quantum curious community 🫶

qubit-social.xyz/@sreedhar/109
maintained by @sreedhar

qubit-social.xyz/

fedi.directory/tag/quantum-com

communitywiki.org/trunk/ is more general, not very specific

fediverse.info/explore/topics/

fediverse.info/explore/topics/

How can #quantumcomputers be combined with conventional #supercomputing facilities to create the #quantumcomputing ecosystem of the future? 🖥️⚛️

In Episode 11 of #insideQuantum, we talk to Dr Alba Cervera-Lierta of the Barcelona Supercomputing Center, and co-ordinator of Quantum Spain, to find out!

youtu.be/9qIz2kOiRiQ