Information Gain and Loss for a Quantum Maxwell's Demon

被引:106
|
作者
Naghiloo, M. [1 ]
Alonso, J. J. [2 ]
Romito, A. [3 ]
Lutz, E. [2 ,4 ]
Murch, K. W. [1 ,5 ]
机构
[1] Washington Univ, Dept Phys, St Louis, MO 63130 USA
[2] Friedrich Alexander Univ Erlangen Nurnberg, Dept Phys, D-91058 Erlangen, Germany
[3] Univ Lancaster, Dept Phys, Lancaster LA1 4YB, England
[4] Univ Stuttgart, Inst Theoret Phys 1, D-70550 Stuttgart, Germany
[5] Inst Mat Sci & Engn, St Louis, MO 63130 USA
基金
英国工程与自然科学研究理事会;
关键词
CONTINUOUS OBSERVABLES; JARZYNSKI EQUALITY; THERMODYNAMICS; COLLOQUIUM; CONVERSION; SYSTEM; STATES; WORK;
D O I
10.1103/PhysRevLett.121.030604
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We use continuous weak measurements of a driven superconducting qubit to experimentally study the information dynamics of a quantum Maxwell's demon. We show how information gained by a demon who can track single quantum trajectories of the qubit can be converted into work using quantum coherent feedback. We verify the validity of a quantum fluctuation theorem with feedback by utilizing information obtained along single trajectories. We demonstrate, in particular, that quantum backaction can lead to a loss of information in imperfect measurements. We furthermore probe the transition between information gain and loss by varying the initial purity of the qubit.
引用
收藏
页数:6
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