Quantum reference frames and their applications to thermodynamics

Sandu Popescu, Ana Belén Sainz, Anthony J. Short, Andreas Winter

Research output: Contribution to journalArticleResearchpeer-review

10 Citations (Scopus)

Abstract

© 2018 Royal Society Publishing. All rights reserved. We construct a quantum reference frame, which can be used to approximately implement arbitrary unitary transformations on a system in the presence of any number of extensive conserved quantities, by absorbing any back action provided by the conservation laws. Thus, the reference frame at the same time acts as a battery for the conserved quantities. Our construction features a physically intuitive, clear and implementation-friendly realization. Indeed, the reference system is composed of the same types of subsystems as the original system and is finite for any desired accuracy. In addition, the interaction with the reference frame can be broken down into two-body terms coupling the system to one of the reference frame subsystems at a time. We apply this construction to quantum thermodynamic set-ups with multiple, possibly non-commuting conserved quantities, which allows for the definition of explicit batteries in such cases. This article is part of a discussion meeting issue 'Foundations of quantum mechanics and their impact on contemporary society'.
Original languageEnglish
Article number20180111
JournalPhilosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
Volume376
Issue number2123
DOIs
Publication statusPublished - 13 Jul 2018

Keywords

  • Conservation laws
  • Quantum thermodynamics
  • Reference frames

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