Stroboscopic qubit measurement with squeezed illumination

Abstract

Microwave squeezing represents the ultimate sensitivity frontier for superconducting qubit measurement. However, observation of enhancement has remained elusive, in part because integration with conventional dispersive readout pollutes the signal channel with antisqueezed vacuum. Here we induce a stroboscopic light-matter coupling with superior squeezing compatibility, and observe an increase in the room-temperature signal-to-noise ratio of 24%. Squeezing the orthogonal phase controls measurement backaction, slowing dephasing by a factor of 1.8. This protocol enables the practical use of microwave squeezing for qubit state measurement.

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Cited by in corpus (30)

• Circuit Quantum Electrodynamics
• Quantum amplification of mechanical oscillator motion
• Fast Universal Control of an Oscillator with Weak Dispersive Coupling to a Qubit
• Gated conditional displacement readout of superconducting qubits
• Probing quantum devices with radio-frequency reflectometry
• Antiferromagnetic magnons as highly squeezed Fock states underlying quantum correlations
• Josephson Array Mode Parametric Amplifier
• Dissipative stabilization of squeezing beyond 3 dB in a microwave mode
• Stabilizing two-qubit entanglement by mimicking a squeezed environment
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• Continuous real-time tracking of a quantum phase below the standard quantum limit
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• Dynamically enhancing qubit-photon interactions with anti-squeezing
• Exponentially Improved Dispersive Qubit Readout with Squeezed Light
• On the static effective Lindbladian of the squeezed Kerr oscillator
• Proposal for a continuous wave laser with linewidth well below the standard quantum limit
• Controlling chaos in the quantum regime using adaptive measurements
• Asymptotic optimality of twist-untwist protocols for Heisenberg scaling in atomic interferometry
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• A practical guide for building superconducting quantum devices
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• Quantum feedback for measurement and control