Erlangen 2022 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 4: Quantum Information (Concepts and Methods) I
Q 4.8: Vortrag
Montag, 14. März 2022, 15:45–16:00, Q-H12
Joint measurability in non-equilibrium quantum thermodynamics — •Konstantin Beyer1, Roope Uola2, Kimmo Luoma3, and Walter Strunz1 — 1TU Dresden, Dresden, Germany — 2University of Geneva, Geneva, Switzerland — 3University of Turku, Turku, Finland
Quantum work and fluctuation theorems are mostly discussed in the framework of projective two-point measurement (TPM) schemes. According to a well known no-go theorem, there is no work observable which satisfies both (i) an average work condition and (ii) the TPM statistics for diagonal input states.
Projective measurements are an idealization and difficult to implement in experiments. We generalize the TPM scenario to arbitrary measurements and ask if the no-go theorem still holds. The answer is twofold. If the initial and the final measurement are incompatible for at least some intermediate unitary evolution, a work observable cannot be constructed. However, if the measurements in the TPM scheme are jointly measurable for any unitary, the no-go theorem does not hold anymore. Then, a (noisy) work observable that satisfies (i) and (ii) can exist.