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Abstract:

We present a new method to measure the work w performed on a driven quantum system and to sample its probability distribution P(w). The method is based on a simple fact that remained unnoticed until now: Work on a quantum system can be measured by performing a generalized quantum measurement at a single time. Such measurement, which technically speaking is denoted as a positive operator valued measure reduces to an ordinary projective measurement on an enlarged system. This observation not only demystifies work measurement but also suggests a new quantum algorithm to efficiently sample the distribution P(w). This can be used, in combination with fluctuation theorems, to estimate free energies of quantum states on a quantum computer. © 2014 American Physical Society.

Registro:

Documento: Artículo
Título:Work measurement as a generalized quantum measurement
Autor:Roncaglia, A.J.; Cerisola, F.; Paz, J.P.
Filiación:Departamento de Física, FCEyN, Ciudad Universitaria, Buenos Aires, 1428, Argentina
IFIBA CONICET, FCEyN, Ciudad Universitaria, Buenos Aires, 1428, Argentina
Palabras clave:Productivity; Quantum computers; Quantum electronics; Quantum optics; Fluctuation theorems; Positive operator valued measure; Projective measurement; Quantum algorithms; Quantum measurement; Quantum state; Quantum system; Work measurement; Probability distributions
Año:2014
Volumen:113
Número:25
DOI: http://dx.doi.org/10.1103/PhysRevLett.113.250601
Título revista:Physical Review Letters
Título revista abreviado:Phys Rev Lett
ISSN:00319007
CODEN:PRLTA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00319007_v113_n25_p_Roncaglia

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Citas:

---------- APA ----------
Roncaglia, A.J., Cerisola, F. & Paz, J.P. (2014) . Work measurement as a generalized quantum measurement. Physical Review Letters, 113(25).
http://dx.doi.org/10.1103/PhysRevLett.113.250601
---------- CHICAGO ----------
Roncaglia, A.J., Cerisola, F., Paz, J.P. "Work measurement as a generalized quantum measurement" . Physical Review Letters 113, no. 25 (2014).
http://dx.doi.org/10.1103/PhysRevLett.113.250601
---------- MLA ----------
Roncaglia, A.J., Cerisola, F., Paz, J.P. "Work measurement as a generalized quantum measurement" . Physical Review Letters, vol. 113, no. 25, 2014.
http://dx.doi.org/10.1103/PhysRevLett.113.250601
---------- VANCOUVER ----------
Roncaglia, A.J., Cerisola, F., Paz, J.P. Work measurement as a generalized quantum measurement. Phys Rev Lett. 2014;113(25).
http://dx.doi.org/10.1103/PhysRevLett.113.250601