Bulletin of the American Physical Society
APS March Meeting 2021
Volume 66, Number 1
Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session Y34: General Quantum Information: Quantum Simulation and Algorithms
11:30 AM–2:30 PM,
Friday, March 19, 2021
Sponsoring
Unit:
DQI
Chair: Davide Girolami, Los Alamos National Laboratory
Abstract: Y34.00006 : Analog of a quantum heat engine using a single-spin qubit*
12:30 PM–12:42 PM
Live
Presenter:
Sergey Shevchenko
(ILTPE and Kharkov Univ., Ukraine)
Authors:
Sergey Shevchenko
(ILTPE and Kharkov Univ., Ukraine)
K. Ono
(RIKEN, Japan)
Takahiro Mori
(AIST, Japan)
S. Moriyama
(Tokyo Denki Univ, Japan)
Franco Nori
(RIKEN, Japan and Univ. Michigan, USA)
Thermodynamics was originally developed for classical many-particle systems, but recently it is being applied for the description of individual quantum systems. What essentially distinguishes the working medium of a quantum heat engine from a classical one is the ability to be in a coherent superposition of its states. In this way, the study of superpositional interference phenomena in prototypical quantum heat engines is important. The simplest realization of a quantum heat machine would be a two-level system.
Our system – a single-spin qubit based on impurities in a silicon transistor – has unique degrees of quantum control at the relatively "high" temperature of 1.6 K. By fine-tuning voltages (macroscopic parameters) we can prepare and read-out any desirable state of our individual quantum system. We demonstrated that, while being properly driven, such single-spin qubit experiences cycles analogous to the ones of an Otto heat engine; but now, importantly, displaying quantum superposition. [1]
[1] K. Ono, S. N. Shevchenko, T. Mori, S. Moriyama, F. Nori, Phys. Rev. Lett. 125, 166802 (2020). Editors' Suggestion.
*This work was supported by the ARO, JSPS, JST, MEXT, NTT, AFOSR, AOARD, FQXi.
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