The role of quantum coherence in energy fluctuations

Abstract

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.

5+11 pages, 2+8 figures. This work supersedes arXiv:2006.06208. However, we decided to leave the latter on the arXiv in light of its own merits

References in corpus (5)

• Fluctuation theorems: Work is not an observable
• Description of quantum coherence in thermodynamic processes requires constraints beyond free energy
• Non-equilibrium quantum fluctuations of work
• Probing Quantum Interference Effects in the Work Distribution
• Energetic cost of Hamiltonian quantum gates

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• On the role of initial coherence in the spin phase-space entropy production rate
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• Single energy measurement Integral Fluctuation theorem and non-projective measurements
• Revising the quantum work fluctuation framework to encompass energy conservation
• Coherent heat exchange in a prethermalizing open quantum system
• Energy exchange statistics and fluctuation theorem for non-thermal asymptotic states