Philippe Faist
@phfaist
Followers
2K
Following
3K
Media
20
Statuses
258
Tenured Senior Researcher in quantum information at the Freie Universität Berlin (prev.: PhD at ETH Zurich @ETH_physics / post-doc at Caltech @IQIM_Caltech)
Joined September 2017
Sumeet Khatri and I answer this question in https://t.co/cCv9ueIvba (short) and https://t.co/ZqQTajgVih (technical). I've got a longer post & a thread on other social media platforms for whoever would like a short thread-style summary.
arxiv.org
The thermal state plays a number of significant roles throughout physics, information theory, quantum computing, and machine learning. It arises from Jaynes' maximum-entropy principle as the...
1
0
2
We all have a favorite characterization of the thermal state: as an equilibrium state, via a maximum entropy principle, from the resource theory of thermodynamics, as a step in learning algorithms, among others. What is the analogous concept for quantum channels?
2
1
12
We are thrilled to announce that the 6th edition of QCTiP will be in Berlin on the 23-25 April!
5
18
45
But that’s not true is it. After all, your ears can definitely tell when you play a “wrong” note, even if it’s not written down. We often argued, “but the best jazz musicians don’t follow the rules, why should we?” The answer is because we were not the best. We were beginners
2
4
20
@landi_qt2 @curlyqubit @qalypsoschool @cybermerqury Today we moved into the exciting realm of Quantum Error Correction @qalypsoschool , guided by the steady hand of @phfaist 🤩
1
1
8
The EC Zoo is now on Discord! Join us to discuss all things error correction:
discord.com
Discord is great for playing games and chilling with friends, or even building a worldwide community. Customize your own space to talk, play, and hang out.
0
3
16
The conference will be held in Berlin on Sept 10-12, 2024. More information, submission, and registration here: https://t.co/SFxEbjCniq . Hope to see many of you in Berlin :)
premc.org
Quantum Technology International Conference series covers quantum communication, computation, simulation, sensing and metrology
0
0
0
Our amazing confirmed plenary speakers include: Antonio Acin, Markus Aspelmayer, Mete Atature (@MeteAtature), Stacey Jeffery, Richard Kueng (@RichardKueng), Anthony Leverrier (@letonyo), Maria Schuld, Christine Silberhorn, Jelena Vuckovic, ... and more to be confirmed! ...
1
0
2
How do you track the latest exciting developments in the dynamic and constantly evolving field of quantum information science and technology? You organize a conference with awesome invited speakers and many opportunities for contributed talks. Please join us for #QTech2024! ...
1
1
15
We are pleased to introduce the co-chairman Dr. @phfaist. Find out more information about the conference on our website : https://t.co/uA29dfKtPt
#QTECH2024 #Quantum #PremC #Berlin
0
1
13
Follow us on our journey to include a notion of time in thermodynamics in our new preprint, which also contains many more details and results. Special thanks to wonderful collaborators Anthony, @nagateja95, @haferjonas, @nicoleyh11 and @jenseisert! https://t.co/A3KqHNjbc1 7/7
arxiv.org
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...
0
3
15
The complexity entropy might be an appropriate measure of randomness in many scenarios. After all, an environment can’t probe a system using complex observables. Applications can lie beyond thermodynamics, including information-theoretic tasks under complexity limitations. 6/
1
0
7
Beyond the erasure of a quantum memory, limiting the complexity of processes in thermodynamics forbids processes that require an unrealistically long time. Furthermore, we didn’t fix the Hamiltonian of the system, as can be common in some other approaches. 5/
1
0
6
This is the manifestation of a general trade-off between the complexity cost and work cost to reset a quantum state. This trade-off is quantified by what we termed the “complexity entropy.” It tells us how random a state *looks* under observables of limited complexity. 4/
1
0
6
If the memory’s state is pure but complex, the resetting unitary must be a large & complex quantum circuit. But rather than spending a large complexity to achieve erasure at no work cost, we can spend work instead, resetting each qubit individually at low complexity cost. 3/
1
0
7
Suppose we reset a quantum memory register to the all-zero state |00…⟩. According to Landauer’s principle, this operation requires work. But not necessarily so if the initial state is pure, since a unitary operation achieves the desired erasure in a reversible way. 2/
1
0
6
Conventional thermodynamics dictates which processes are or aren’t allowed. Yet it omits to forbid processes that are too complex to be realistic, such as cooling systems with complicated energy landscapes. Here’s our take on how to fix this omission. https://t.co/A3KqHNjbc1 1/
arxiv.org
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...
2
9
60
Complexity-constrained quantum thermodynamics https://t.co/04NzN3Nu3Z 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
1
20
114
One among a number of wonderful talks at the exciting BIRS workshop in Banff organized by @dsfranca, @AngelaCapelC, @quekpottheories, @RaulGarciaPatr1, and Salman Beigi.
1
0
5