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Abstract:

Quantum work is usually determined from two projective measurements of the energy at the beginning and at the end of a thermodynamic process. However, this paradigm cannot be considered thermodynamically consistent as it does not account for the thermodynamic cost of these measurements. To remedy this conceptual inconsistency we introduce a paradigm that relies only on the expected change of the average energy given the initial energy eigenbasis. In particular, we completely omit quantum measurements in the definition of quantum work, and hence quantum work is identified as a thermodynamic quantity of only the system. As main results we derive a modified quantum Jarzynski equality and a sharpened maximum work theorem in terms of the information free energy. A comparison of our results with the standard approach allows one to quantify the informational cost of projective measurements. © 2016 American Physical Society.

Registro:

Documento: Artículo
Título:Quantum work and the thermodynamic cost of quantum measurements
Autor:Deffner, S.; Paz, J.P.; Zurek, W.H.
Filiación:Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM 87545, United States
Center for Nonlinear Studies, Los Alamos National Laboratory, Los Alamos, NM 87545, United States
Departamento de Física, FCEyN, UBA, Ciudad Universitaria Pabellón 1, Buenos Aires, 1428, Argentina
IFIBA CONICET, FCEyN, UBA, Ciudad Universitaria Pabellón 1, Buenos Aires, 1428, Argentina
Palabras clave:Costs; Free energy; Average energy; Initial energy; Jarzynski equality; Maximum works; Projective measurement; Quantum measurement; Thermodynamic process; Thermodynamic quantities; Thermodynamics
Año:2016
Volumen:94
Número:1
DOI: http://dx.doi.org/10.1103/PhysRevE.94.010103
Título revista:Physical Review E
Título revista abreviado:Phys. Rev. E
ISSN:24700045
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_24700045_v94_n1_p_Deffner

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Citas:

---------- APA ----------
Deffner, S., Paz, J.P. & Zurek, W.H. (2016) . Quantum work and the thermodynamic cost of quantum measurements. Physical Review E, 94(1).
http://dx.doi.org/10.1103/PhysRevE.94.010103
---------- CHICAGO ----------
Deffner, S., Paz, J.P., Zurek, W.H. "Quantum work and the thermodynamic cost of quantum measurements" . Physical Review E 94, no. 1 (2016).
http://dx.doi.org/10.1103/PhysRevE.94.010103
---------- MLA ----------
Deffner, S., Paz, J.P., Zurek, W.H. "Quantum work and the thermodynamic cost of quantum measurements" . Physical Review E, vol. 94, no. 1, 2016.
http://dx.doi.org/10.1103/PhysRevE.94.010103
---------- VANCOUVER ----------
Deffner, S., Paz, J.P., Zurek, W.H. Quantum work and the thermodynamic cost of quantum measurements. Phys. Rev. E. 2016;94(1).
http://dx.doi.org/10.1103/PhysRevE.94.010103