2013/02/28 by Arne L. Grimsmo
Computer Science · Physics and Astronomy · #Advanced Thermodynamics and Statistical Mechanics #Open quantum system #Physics #Quantum #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum algorithm #Quantum discord #Quantum dynamics #Quantum information #Quantum mechanics #Quantum operation #Quantum process #Statistical physics #Work (physics) #quant-ph
paper · pdf · doi:10.1103/physreva.87.060302
published as Phys. Rev. A 87, 060302 (2013) · 5 pages, 2 figure
openalex publication_date 2013/06/17 · arxiv created 2013/06/19 · arxiv updated 2014/08/27 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We consider the role of quantum correlations in the efficient use of information by a predictive quantum system, generalizing a recently proposed classical measure of nonpredictive information to the quantum regime. We show that, as a quantum system changes state, the nonpredictive information held by another correlated quantum system is exactly equal to the extractable work that is lost from the second system. We use quantum discord to quantify the quantum contribution, and demonstrate the possibility of improved thermodynamic efficiency due to a negative ``quantum part'' of the lost work. We also give a thermodynamic interpretation to quantum discord, as the reduction in extractable work under an optimal classical approximation of a quantum memory.