17-22 July 2022
Royal Conservatory of Music, Toronto
America/Toronto timezone

Violation of the Leggett-Garg inequality for a Bose condensate in a double-well potential

21 Jul 2022, 17:00
1h 30m
Hart House (Hart House)

Hart House

Hart House

7 Hart House Cir, Toronto, ON M5S 3H3
Poster presentation Degenerate gases, many-body physics, and quantum simulation Poster session


Mr Tsubasa Sakamoto (Chuo university)


The Leggett-Garg (LG) inequality tells us whether or not the dynamics of the macro- scopic system obeys macrorealism, which consists of the assumptions put forward by Leggett and Garg. Violation of the LG inequality implies either the absence of a realistic description of the system or the impossibility of measuring the system noninvasively. In recent works, the LG inequality is experimentally examined in a superconducting flux qubit.
In our study, we discuss the violation of the LG inequality for a Bose condensate in a double-well potential. For the closed system, we clarify the region of the parameters where the LG inequality is violated. For the open system, coupled to a single bosonic mode, we obtain the collapse and revival of the occupation probabilities of the state in a double-well potential, which recursively violates the LG inequality. Furthermore, we reveal the dependence of the violation of the LG inequality on both the coupling strength and the maximum energy of the bath.

Presenter name Tsubasa Sakamoto

Primary authors

Mr Tsubasa Sakamoto (Chuo university) Prof. Ryosuke Yoshii (Sanyo-Onoda City University ) Prof. Shunji Tsuchiya (Chuo University)

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