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- W4311346046 abstract "We successfully demonstrate low-frequency noise suppression in the resonant-frequency fluctuations of a cavity-embedded Cooper-pair transistor (cCPT) driven at single-photon occupancy. In particular, we report a reduction in the resonant-frequency fluctuations caused by the internal charge noise over a bandwidth of approximately $1.4phantom{rule{0.2em}{0ex}}text{kHz}$ when the cavity is driven at an average photon number $n=10$ and a bandwidth of 11 Hz for an average $n=1$. The gate-dependent tunability of the cCPT allows us to implement a feedback scheme derived from the Pound-Drever-Hall locking technique. This reduces fluctuations due to intrinsic charge noise, which otherwise interfere with the operation of the cCPT as a near quantum-limited electrometer. Our technique can be generalized to achieve frequency stabilization in tunable microwave resonators that play a vital role in today's quantum computing architectures, thereby moderating the limitations in detection caused by the intrinsic $1/f$ noise on such circuit devices. The work discusses the various aspects relating to the operation of a fully functional feedback loop down to the single-photon level." @default.
- W4311346046 created "2022-12-25" @default.
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- W4311346046 date "2022-12-13" @default.
- W4311346046 modified "2023-10-10" @default.
- W4311346046 title "Feedback Stabilization of the Resonant Frequency in a Tunable Microwave Cavity with Single-Photon Occupancy" @default.
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- W4311346046 doi "https://doi.org/10.1103/physrevapplied.18.064033" @default.
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