Measuring the characteristic function of the work distribution

Abstract

We propose an interferometric setting for the ancilla-assisted measurement of the characteristic function of the work distribution following a time-dependent process experienced by a quantum system. We identify how the configuration of the effective interferometer is linked to the symmetries enjoyed by the Hamiltonian ruling the process and provide the explicit form of the operations to implement in order to accomplish our task. We finally discuss two physical settings, based on hybrid opto-/electro-mechanical devices, where the theoretical proposals discussed in our work could find an experimental demonstration.

6 pages; 2 figures; RevTeX4; See related paper by R. Dorner et al, arXiv:1301.7021; This version: more results added; accepted for publication in Phys. Rev. Lett

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