The role of quantum coherence in energy fluctuations
We discuss the role of quantum coherence in the energy fluctuations of open
quantum systems. To this aim, we introduce a protocol, to which we refer to as
the end-point-measurement scheme, allowing to define the statistics of energy
changes as a function of energy measurements performed only after the evolution
of the initial state. At the price of an additional uncertainty on the initial
energies, this approach prevents the loss of initial quantum coherences and
enables the estimation of their effects on energy fluctuations. We demonstrate
our findings by running an experiment on the IBM Quantum Experience
superconducting qubit platform.
S. Gherardini A. Belenchia M. Paternostro A. Trombettoni