Dissipation Enables Strongly Detuning-Dependent Interference in Pulsed Dynamical Decoupling

Abstract:One of the defining features of pulsed dynamical decoupling is its suppression of a driven qubit's sensitivity to static detuning errors between the drive field and qubit resonance. In this paper, we show that dissipation, in the form of excited-state decay, can change this behavior entirely, producing an interference signal with a strong detuning dependence. This signal arises from decay during driven evolution and relies on coherence retained by the qubit after such a decay event. We develop analytical and numerical models that capture the underlying mechanism and observe this same dissipation-induced detuning dependence experimentally in both a free-space strontium atom interferometer and a superconducting transmon qubit system. We also use this dissipation-induced detuning dependence as the basis for a new spectroscopic technique called Dissipative Carr-Purcell Spectroscopy (DCPS) and compare it with a traditional Ramsey sequence. Our results establish a regime of pulsed dynamical decoupling in which dissipation reshapes, rather than merely degrades, coherent control, and we expect these dynamics to be relevant to a wide range of quantum systems.

Quantum Physics (quant-ph); Atomic Physics (physics.atom-ph)

arXiv:2607.25176 [quant-ph]

(or arXiv:2607.25176v1 [quant-ph] for this version)

https://doi.org/10.48550/arXiv.2607.25176 Focus to learn more arXiv-issued DOI via DataCite (pending registration)

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