Seminars & Events

May 20th, 2020 at 2:00 pm CET

Speaker: Borhan Ahmadi
ICTQT, Poland
Title: No Entropy Production in Quantum Thermodynamics

Abstract: I am going to give a controversial seminar concerning entropy production in quantum thermodynamics. I will show that there exists a fundamental difference between microscopic quantum thermodynamics and macroscopic classical thermodynamics. It will be proved that the entropy production in quantum thermodynamics always vanishes for both closed and open quantum systems! This novel and the very surprising result is derived based on the genuine reasoning Clausius used to establish the science of thermodynamics. This result will interestingly lead to defining the generalized temperature for any non-equilibrium quantum system.

Link to the paper: https://arxiv.org/abs/2002.10747

Join us via ZOOM: https://zoom.us/j/703988067?pwd=UXVvOExYaVpoeFdXenFGaFl3dEo5Zz09

 

 

 

Due to unforeseen circumstances we have had to change our speaker for our 13th of May seminar. Details of the new talk:

May 13th, 2020 at 2:00 pm CET

Speaker: Máté Farkas
ICTQT, Poland
Title: (Semi-)device-independent certification of mutually unbiased bases

Abstract: As quantum technologies advance, the certification of high-dimensional quantum devices becomes more and more relevant. This is essential both for verifying the outcome of quantum computations, and for guaranteeing the security of cryptographic devices. In this talk, I will focus on the certification of quantum measurement devices performing measurements in mutually unbiased bases (MUBs) in arbitrary dimension. MUBs have a myriad of applications in quantum information processing, and therefore these measurement devices constitute basic building blocks of computational and cryptographic devices. I will discuss how to give a characterisation of MUBs that is suitable for semi-device-independent (SDI) certification, that is, certification under the assumption of fixed Hilbert space dimension. Then I will present a protocol that allows for experimental SDI certification of MUBs in arbitrary dimensions (that has since been demonstrated experimentally in dimension 4). Furthermore, I will discuss a relaxed device-independent (DI) characterisation of MUBs, referred to as mutually unbiased measurements (MUMs). While MUMs are strictly more general than MUBs, they share many operational characteristics, and I will present a protocol that allows for their DI certification.

Link to the paper: https://arxiv.org/abs/1803.00363 and https://arxiv.org/abs/1912.03225

Join us via ZOOM: https://zoom.us/j/703988067?pwd=UXVvOExYaVpoeFdXenFGaFl3dEo5Zz09

 

Canceled talk:

May 13th, 2020 at 2:00 pm CET

Speaker: Gláucia Murta
Heinrich-Heine-Universität Düsseldorf, Germany
Title: Device-independent quantum cryptography in the multipartite scenario

Link to the paper: https://arxiv.org/abs/2004.14263

 

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