TY - JOUR
T1 - Universal Coherence-Induced Power Losses of Quantum Heat Engines in Linear Response
AU - Brandner, Kay
AU - Bauer, Michael
AU - Seifert, Udo
PY - 2017/10/25
Y1 - 2017/10/25
N2 - We identify a universal indicator for the impact of coherence on periodically driven quantum devices by dividing their power output into a classical contribution and one stemming solely from superpositions. Specializing to Lindblad dynamics and small driving amplitudes, we derive general upper bounds on both the coherent and the total power of cyclic heat engines. These constraints imply that, for sufficiently slow driving, coherence inevitably leads to power losses in the linear-response regime. We illustrate our theory by working out the experimentally relevant example of a single-qubit engine.
AB - We identify a universal indicator for the impact of coherence on periodically driven quantum devices by dividing their power output into a classical contribution and one stemming solely from superpositions. Specializing to Lindblad dynamics and small driving amplitudes, we derive general upper bounds on both the coherent and the total power of cyclic heat engines. These constraints imply that, for sufficiently slow driving, coherence inevitably leads to power losses in the linear-response regime. We illustrate our theory by working out the experimentally relevant example of a single-qubit engine.
UR - http://www.scopus.com/inward/record.url?scp=85032433505&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.119.170602
DO - 10.1103/PhysRevLett.119.170602
M3 - Article
VL - 119
SP - 1
EP - 7
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 17
M1 - 170602
ER -