原子核理論研究室

Date: September 15th (Tue) 11:00-

Place: Meeting Room A, Center for Computational Sciences (1F)

Lecturer: Dr Gentaro Watanabe (IBS, Korea)

Title: Quantum fluctuation theorems and generalized measurements: towards their verification using cold atomic gases

Abstract: We discuss transient fluctuation theorems in quantum systems, i.e., quantum Jarzynski equality and Tasaki-Crooks relation. In these quantum fluctuation theorems, work is defined by the projective energy measurements at the beginning and the end of the force protocol. However, projective measurements are difficult to implement experimentally. This is a major obstacle to the direct verification of the transient fluctuation theorems in quantum systems. It is thus important to ask whether these projective measurements can be replaced with generalized measurements which could be easier to implement [1-3]. First, we prove a kind of no-go theorem that only projective measurements can satisfy the Crooks relation for an arbitrary force protocol [1]. Then we show that, however, we can overcome this no-go theorem [3]. We will also discuss the future prospects towards the verification of the quantum fluctuation theorems using cold atomic gases.

[1] B. P. Venkatesh, G. Watanabe, and P. Talkner, New J. Phys. 16, 015032(2014).

[2] G. Watanabe, B. P. Venkatesh, P. Talkner, M. Campisi, and P. Haenggi, Phys. Rev. E 89, 032114 (2014).

[3] G. Watanabe, B. P. Venkatesh, and P. Talkner, Phys. Rev. E 89, 052116 (2014).

* The seminar is given in English.