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Correlators Exceeding One in Continuous Measurements of Superconducting Qubits
Here, e ponder the effect of phase backaction on the correlator ⟨I(t)I(t+τ)⟩ for the output signal I(t) from continuous measurement of a qubit. We demonstrate that the interplay between informational and phase backactions in the presence of Rabi oscillations can lead to the correlator becoming larger than 1, even though |⟨I⟩|≤1. The correlators can be calculated using the generalized "collapse recipe," which we validate using the quantum Bayesian formalism. Moreover, he recipe can be generalized to the case of multitime correlators and arbitrary number of detectors, measuring non-commuting qubit observables. The theory agrees well with experimental results for continuous measurement of a transmon qubit. The experimental correlator exceeds the bound of 1 for a sufficiently large angle between the amplified and informational quadratures, causing the phase backaction. The demonstrated effect can be used to calibrate the quadrature misalignment.
Searching for Dark Matter with a Superconducting Qubit
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Observation of Discrete Charge States of a Coherent Two-Level System in a Superconducting Qubit
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RF mixing modules for superconducting qubit room temperature control systems v1.0
We have developed a series of compact RF mixing boards by integrating I/Q quadrature mixing, IF(intermediate frequency)/LO(local oscillator)/RF power level adjustments, and DC (direct current) bias fine tuning on a 40 mm × 80 mm 4-layer PCB (printed circuit board) board with EMI (electromagnetic interference) shielding.
Fundamental understanding of magnetic vortex dynamics on superconducting qubits for quantum computing
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Analysis of Microscopic Defects in Nb thin films for superconducting qubits and SRF cavities
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Interfacial Width Analysis of Metal Capping Layers and Niobium in Superconducting Qubits
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Algorithm driven fault tolerant architectures based on superconducting qubits
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Wavelike Dark Matter Searches with SRF Cavities and Superconducting Qubits at SQMS
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Fast ZZ-Free Entangling Gates for Superconducting Qubits Assisted by a Driven Resonator
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SERAPH: Wavelike Dark Matter Searches with SRF Cavities and Superconducting Qubits at SQMS
Talk about the SERAPH experiment to look for axions and dark photons.
Decoherence Noise on the Superconducting Qubits Training Program
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Superconducting Qubits as Quantum Sensors for the Detection of Ionizing Radiation
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Experimental Investigation of Superconducting Qubits as Quantum Sensors for the Detection of Ionizing Radiation
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SRF cavities and Superconducting qubits for Gravitational Waves and Dark Photons detection
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