TY - JOUR
T1 - Quantum reference frames and their applications to thermodynamics
AU - Popescu, Sandu
AU - Sainz, Ana Belen
AU - Short, Tony
AU - Winter, Andreas
PY - 2018/7/13
Y1 - 2018/7/13
N2 - 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'.
AB - 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'.
KW - Conservation laws
KW - Quantum thermodynamics
KW - Reference frames
UR - http://www.scopus.com/inward/record.url?scp=85048784007&partnerID=8YFLogxK
U2 - 10.1098/rsta.2018.0111
DO - 10.1098/rsta.2018.0111
M3 - Article
VL - 376
JO - Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
JF - Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
SN - 1364-503X
IS - 2123
M1 - 20180111
ER -