Temporal Diffraction Grating for Engineered Superconducting Qubit Dissipation

• URL: http://arxiv.org/abs/2607.17562v1
• Date: Mon, 20 Jul 2026 05:16:44 GMT
• Title: Temporal Diffraction Grating for Engineered Superconducting Qubit Dissipation
• Abstract summary: Parametric frequency modulation is a tool in superconducting circuits for activating tunable interactions and implementing quantum gates.<n>Here, we engineer dissipation in a flux-tunable transmon qubit by using sideband modulation to bring it into resonance with a lossy resonator, opening an on-demand Purcell decay channel.<n>We find that pulsing this channel on and off does not simply lower the time-averaged decay rate; instead, it reorganizes the dissipation spectrum into a structured interference pattern.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Parametric frequency modulation is a standard tool in superconducting circuits for activating tunable interactions and implementing quantum gates. Here, we engineer dissipation in a flux-tunable transmon qubit by using sideband modulation to bring it into resonance with a lossy resonator, opening an on-demand Purcell decay channel. We find that pulsing this channel on and off does not simply lower the time-averaged decay rate; instead, it reorganizes the dissipation spectrum into a structured interference pattern. A Chebyshev-propagator model for the repeated on/off block reproduces the measured spectra and reveals a close structural correspondence to N-slit Fraunhofer diffraction, with each on-window acting as a temporal aperture. By varying the pulse duration and duty cycle, we demonstrate control over the spacing, contrast, and envelope of the dissipation spectrum. These results establish pulsed parametric modulation as a direct method for shaping engineered dissipation in superconducting circuits and provide a new control knob for open quantum system dynamics.

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