00527nas a2200157 4500008003900000022001400039245007800053210006900131260001600200490000800216100001900224700002300243700002300266700002000289856006000309 2020 d a0031-900700aReference Frames Which Separately Store Noncommuting Conserved Quantities0 aReference Frames Which Separately Store Noncommuting Conserved Q cJan-08-20200 v1251 aPopescu, Sandu1 aSainz, Ana, Belén1 aShort, Anthony, J.1 aWinter, Andreas uhttps://link.aps.org/doi/10.1103/PhysRevLett.125.09060100629nas a2200169 4500008003900000022001400039245007000053210006900123260001600192300001300208490001400221100001900235700001800254700002300272700002000295856014400315 2018 d a1364-503X00aQuantum reference frames and their applications to thermodynamics0 aQuantum reference frames and their applications to thermodynamic cJan-07-2019 a201801110 v376(2123)1 aPopescu, Sandu1 aSainz, Belén1 aShort, Anthony, J.1 aWinter, Andreas uhttp://rsta.royalsocietypublishing.org/lookup/doi/10.1098/rsta.2018.0111https://syndication.highwire.org/content/doi/10.1098/rsta.2018.011101600nas a2200169 4500008003700000022001600037245007200053210006900125260001300194490001000207520108100217100001901298700002201317700002301339700002001362856004801382 0 d a{1364-503X}00a{Quantum reference frames and their applications to thermodynamics}0 aQuantum reference frames and their applications to thermodynamic c{JUL 13}0 v{376}3 a{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'.}

1 aPopescu, Sandu1 aSainz, Ana, Belen1 aShort, Anthony, J.1 aWinter, Andreas uhttps://grupsderecerca.uab.cat/giq/node/919