Dissipation Enables Strongly Detuning-Dependent Interference in Pulsed Dynamical Decoupling

• URL: http://arxiv.org/abs/2607.25176v1
• Date: Tue, 28 Jul 2026 01:01:05 GMT
• Title: Dissipation Enables Strongly Detuning-Dependent Interference in Pulsed Dynamical Decoupling
• Abstract summary: 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.<n>This signal arises from decay during driven evolution and relies on coherence retained by the qubit after such a decay event.<n>We use this dissipation-induced detuning dependence as the basis for a new spectroscopic technique called Dissipative Carr-Purcell spectroscopy.
• Score: 1.6255299845656959
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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.

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