Signature of quantumness in pure decoherence control

0575218 - FZÚ 2024 RIV US eng J - Journal Article
Rzepkowski, B. - Roszak, Katarzyna
Signature of quantumness in pure decoherence control.
Physical Review A. Roč. 108, č. 1 (2023), č. článku 012412. ISSN 2469-9926. E-ISSN 2469-9934
Institutional support: RVO:68378271
Keywords : decoherence * quantumness * qubits * quantum dots
OECD category: Optics (including laser optics and quantum optics)
Impact factor: 2.9, year: 2022
Method of publishing: Limited access
https://doi.org/10.1103/PhysRevA.108.012412

We study a decoherence reduction scheme that involves an intermediate measurement on the qubit in an equal superposition basis, in the general framework of all qubit-environment interactions that lead to qubit pure decoherence. We show under what circumstances the scheme always leads to a gain of coherence on average, regardless of the time at which the measurement is performed, demonstrating its wide range of applicability. Furthermore, we find that observing an average loss of coherence is a highly quantum effect, resulting from noncommutation of different terms in the Hamiltonian. We show the diversity of behavior of coherence as effected by the application of the scheme, which is skewed towards gain rather than loss, on a variant of the spin-boson model that does not fulfill the commutation condition.
Permanent Link: https://hdl.handle.net/11104/0346925