Characterization of non-Markovianity with maximal extractable qubit-reservoir entanglement
arxiv(2024)
摘要
Understanding the dynamical behavior of a qubit in a reservoir is critical to
applications in quantum technological protocols, ranging from quantum
computation to quantum metrology. The effect of the reservoir depends on
reservoir's spectral structure, as well as on the qubit-reservoir coupling
strength. We here propose a measure for quantifying the non-Markovian effect of
a reservoir with a Lorentzian spectrum, based on the maximum qubit-reservoir
quantum entanglement that can be extracted. Numerical simulation shows this
entanglement exhibits a monotonous behavior in response to the variation of the
coupling strength. We confirm the validity of this measure with an experiment,
where a superconducting qubit is controllably coupled to a lossy resonator,
which acts as a reservoir for the qubit. The experimental results illustrate
the maximal extractable entanglement is progressively increased with the
strengthening of the non-Markovianity.
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