Jan Kochanowski
@janfkoch.bsky.social
PhD student in math. physics & quantum info @IPParis.
Formerly TUM&LMU, UniofCam 🇪🇺🏳️🌈
kochanowski.notion.site
Formerly TUM&LMU, UniofCam 🇪🇺🏳️🌈
kochanowski.notion.site
Happy to see that two of my works were accepted to QIP next year!
"Complexity of mixed Schatten norms of quantum maps“: arxiv.org/abs/2507.08358
"Computational aspects of the trace norm contraction coefficient“: arxiv.org/abs/2507.16737
Thank you to my coauthors! Looking forward to the talks.
"Complexity of mixed Schatten norms of quantum maps“: arxiv.org/abs/2507.08358
"Computational aspects of the trace norm contraction coefficient“: arxiv.org/abs/2507.16737
Thank you to my coauthors! Looking forward to the talks.
Complexity of mixed Schatten norms of quantum maps
We study the complexity of computing the mixed Schatten $\|Φ\|_{q\to p}$ norms of linear maps $Φ$ between matrix spaces. When $Φ$ is completely positive, we show that $\| Φ\|_{q \to p}$ can be compute...
arxiv.org
November 10, 2025 at 12:52 PM
Happy to see that two of my works were accepted to QIP next year!
"Complexity of mixed Schatten norms of quantum maps“: arxiv.org/abs/2507.08358
"Computational aspects of the trace norm contraction coefficient“: arxiv.org/abs/2507.16737
Thank you to my coauthors! Looking forward to the talks.
"Complexity of mixed Schatten norms of quantum maps“: arxiv.org/abs/2507.08358
"Computational aspects of the trace norm contraction coefficient“: arxiv.org/abs/2507.16737
Thank you to my coauthors! Looking forward to the talks.
Happy to finally share our new preprint: Efficient Quantum Measurements: Computational Max- and Measured Rényi Divergences and Applications.
scirate.com/arxiv/2509.2...
We are tackling the problem that information theoretic quantities may not be very meaningful in practical scalable experiments.
scirate.com/arxiv/2509.2...
We are tackling the problem that information theoretic quantities may not be very meaningful in practical scalable experiments.
Efficient Quantum Measurements: Computational Max- and Measured Rényi Divergences and Applications
Quantum information processing is limited, in practice, to efficiently implementable operations. This motivates the study of quantum divergences that preserve their operational meaning while faithfull...
scirate.com
September 26, 2025 at 7:35 AM
Happy to finally share our new preprint: Efficient Quantum Measurements: Computational Max- and Measured Rényi Divergences and Applications.
scirate.com/arxiv/2509.2...
We are tackling the problem that information theoretic quantities may not be very meaningful in practical scalable experiments.
scirate.com/arxiv/2509.2...
We are tackling the problem that information theoretic quantities may not be very meaningful in practical scalable experiments.
I’m happy to announce that my new work on „Complexities of mixed Matrix norms“ is out now scirate.com/arxiv/2507.0...
This is joint work with Cambyse Rouzé and Omar Fawzi that’s been quite some time in the making.
This is joint work with Cambyse Rouzé and Omar Fawzi that’s been quite some time in the making.
Complexity of mixed Schatten norms of quantum maps
We study the complexity of computing the mixed Schatten $\|\Phi\|_{q\to p}$ norms of linear maps $\Phi$ between matrix spaces. When $\Phi$ is completely positive, we show that $\| \Phi \|_{q \to p}$ c...
scirate.com
July 14, 2025 at 12:19 PM
I’m happy to announce that my new work on „Complexities of mixed Matrix norms“ is out now scirate.com/arxiv/2507.0...
This is joint work with Cambyse Rouzé and Omar Fawzi that’s been quite some time in the making.
This is joint work with Cambyse Rouzé and Omar Fawzi that’s been quite some time in the making.
I am very happy to announce that my first published article „Rapid Thermalization of Dissipative Many-Body Dynamics of Commuting Hamiltonians“ is now published in Communications in Mathematical Physics.
rdcu.be/euy1Y
I feel honored and humbled to have been accepted in such a prestigious journal.
rdcu.be/euy1Y
I feel honored and humbled to have been accepted in such a prestigious journal.
Rapid Thermalization of Dissipative Many-Body Dynamics of Commuting Hamiltonians - Communications in Mathematical Physics
Quantum systems typically reach thermal equilibrium rather quickly when coupled to a thermal environment. The usual way of bounding the speed of this process is by estimating the spectral gap of the d...
link.springer.com
July 3, 2025 at 4:26 PM
I am very happy to announce that my first published article „Rapid Thermalization of Dissipative Many-Body Dynamics of Commuting Hamiltonians“ is now published in Communications in Mathematical Physics.
rdcu.be/euy1Y
I feel honored and humbled to have been accepted in such a prestigious journal.
rdcu.be/euy1Y
I feel honored and humbled to have been accepted in such a prestigious journal.
Reposted by Jan Kochanowski
PhD position in Quantum Information Theory at Inria/Telecom Paris | Quantiki
www.quantiki.org
April 12, 2025 at 9:57 AM
Reposted by Jan Kochanowski
Postdoc position in Quantum Information Theory at Télécom Paris, Institut Polytechnique de Paris @ipparis.bsky.social
www.quantiki.org/position/pos...
www.quantiki.org/position/pos...
Postdoc position in Quantum Information Theory at Télécom Paris, Institut Polytechnique de Paris | Quantiki
www.quantiki.org
April 12, 2025 at 10:17 AM
Postdoc position in Quantum Information Theory at Télécom Paris, Institut Polytechnique de Paris @ipparis.bsky.social
www.quantiki.org/position/pos...
www.quantiki.org/position/pos...
I’m very happy to announce our new work on Additivity and chain rules for conditional entropies via ‚multi-indexed Schatten norms‘.
We use tools from operator space theory that in a rather ‚simple‘ way give non-trivial chain rules and additivity statements.
Find it at:
arxiv.org/abs/2502.01611
We use tools from operator space theory that in a rather ‚simple‘ way give non-trivial chain rules and additivity statements.
Find it at:
arxiv.org/abs/2502.01611
Additivity and chain rules for quantum entropies via multi-index Schatten norms
The primary entropic measures for quantum states are additive under the tensor product. In the analysis of quantum information processing tasks, the minimum entropy of a set of states, e.g., the minim...
arxiv.org
February 4, 2025 at 9:13 AM
I’m very happy to announce our new work on Additivity and chain rules for conditional entropies via ‚multi-indexed Schatten norms‘.
We use tools from operator space theory that in a rather ‚simple‘ way give non-trivial chain rules and additivity statements.
Find it at:
arxiv.org/abs/2502.01611
We use tools from operator space theory that in a rather ‚simple‘ way give non-trivial chain rules and additivity statements.
Find it at:
arxiv.org/abs/2502.01611
Reposted by Jan Kochanowski
I added some memory to this quantum feed.
Let's see if this works.
The quantum community out here seems to get more lively with time.
Still slower than X somehow.
Convince your friends to join here.
bsky.app/profile/did:...
Let's see if this works.
The quantum community out here seems to get more lively with time.
Still slower than X somehow.
Convince your friends to join here.
bsky.app/profile/did:...
January 19, 2025 at 5:16 PM
I added some memory to this quantum feed.
Let's see if this works.
The quantum community out here seems to get more lively with time.
Still slower than X somehow.
Convince your friends to join here.
bsky.app/profile/did:...
Let's see if this works.
The quantum community out here seems to get more lively with time.
Still slower than X somehow.
Convince your friends to join here.
bsky.app/profile/did:...
I‘m not quite sure if I have the right audience here, but in case you speak both German and are in Munich there will be a reading of a short story I wrote about a funny encounter with the fascination behind physics.
Infos: www.ja.tum.de/ja/events/wo...
The event will, however, only be in German.
Infos: www.ja.tum.de/ja/events/wo...
The event will, however, only be in German.
Wordshop
www.ja.tum.de
January 13, 2025 at 5:36 PM
I‘m not quite sure if I have the right audience here, but in case you speak both German and are in Munich there will be a reading of a short story I wrote about a funny encounter with the fascination behind physics.
Infos: www.ja.tum.de/ja/events/wo...
The event will, however, only be in German.
Infos: www.ja.tum.de/ja/events/wo...
The event will, however, only be in German.
I'm very happy to announce our latest paper on Gibbs state preparation out now: arxiv.org/abs/2412.01732
Tl;dr: Commuting q.Gibbs states satisfying a certain conditional mutual information decay ("the MCMI") property can be prepared efficiently up to small errors in normalized Wasserstein distance.
Tl;dr: Commuting q.Gibbs states satisfying a certain conditional mutual information decay ("the MCMI") property can be prepared efficiently up to small errors in normalized Wasserstein distance.
Quasi-optimal sampling from Gibbs states via non-commutative optimal transport metrics
We study the problem of sampling from and preparing quantum Gibbs states of local commuting Hamiltonians on hypercubic lattices of arbitrary dimension. We prove that any such Gibbs state which satisfi...
arxiv.org
December 3, 2024 at 10:50 AM
I'm very happy to announce our latest paper on Gibbs state preparation out now: arxiv.org/abs/2412.01732
Tl;dr: Commuting q.Gibbs states satisfying a certain conditional mutual information decay ("the MCMI") property can be prepared efficiently up to small errors in normalized Wasserstein distance.
Tl;dr: Commuting q.Gibbs states satisfying a certain conditional mutual information decay ("the MCMI") property can be prepared efficiently up to small errors in normalized Wasserstein distance.
Reposted by Jan Kochanowski
By popular demand, here is a starter pack of all quantum PhD students on BlueSky that we could find.
go.bsky.app/AUTn1di
go.bsky.app/AUTn1di
November 21, 2024 at 6:28 PM
By popular demand, here is a starter pack of all quantum PhD students on BlueSky that we could find.
go.bsky.app/AUTn1di
go.bsky.app/AUTn1di