Speaker
Description
Spin defects in diamond have emerged in the last decade as a prominent platform for quantum technological applications, including quantum sensing, communication and computing. More recently, they have been established as a powerful tool for the investigation of fundamental topics such as quantum thermodynamics of nonequilibrium processes at the nanoscale, where quantum coherence and fluctuations play a major role, and the definition of non-state variables – such as work, heat, and entropy – remains a challenge.
The standard approach to quantifying work distributions is the celebrated two-point measurement (TPM) scheme, which measures energy at the beginning and end of a protocol. However, this scheme measures work distributions only for closed quantum systems and also results in the loss of the initial quantum coherence.
We experimentally demonstrated a weak-TPM scheme on the electronic qutrit spin of a nitrogen-vacancy (NV) center in diamond [1] and an interferometric scheme aided by an ancilla which makes use of the electron-nuclear two-qubit spin system based on an NV center [2] to reconstruct the Kirkwood-Dirac quasiprobability distribution of work under unitary processes. We observed anomalous work extraction and verified the Robertson-Schrödinger uncertainty relation.
We now aim at adapting the interferometric scheme to measure work distribution in an open quantum system dynamics, exploiting the interaction of an NV center with an additional nearby nuclear spin of a Carbon-13.
[1] S. Hernández-Gómez et al., Projective measurements can probe non-classical work extraction and time-correlations, Phys. Rev. Research 6, 023280 (2024)
[2] S. Hernández-Gómez et al., Interferometry of quantum correlation functions to access quasiprobability distribution of work, npj Quantum Information 10, 115 (2024)
| Theme | Theme 3. Theoretical and experimental methods for quantum effects in energy processes |
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