Curator's Take
AI Commentary
This work demonstrates that pulsed parametric modulation can sculpt a qubit’s loss channel into a controllable “temporal diffraction grating,” turning dissipation from a static nuisance into a tunable resource. By mapping the on‑off pulse sequence onto an N‑slit Fraunhofer pattern, the authors achieve fine‑grained control over decay rates, offering a new tool for reservoir engineering, error‑biased gates and dissipative quantum simulations. The approach builds directly on established flux‑tunable transmons, suggesting it can be integrated into existing superconducting platforms, though its effectiveness will depend on precise timing and the bandwidth of the auxiliary resonator.
— Mark Eatherly
Summary
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.