Implementation of a canonical phase measurement with quantum feedback

Abstract

Much of modern metrology and communication technology encodes information in electromagnetic waves, typically as an amplitude or phase. While current hardware can perform near-ideal measurements of photon number or field amplitude, to date no device exists that can even in principle perform an ideal phase measurement. In this work, we implement a single-shot canonical phase measurement on a one-photon wave packet, which surpasses the current standard of heterodyne detection and is optimal for single-shot phase estimation. By applying quantum feedback to a Josephson parametric amplifier, our system adaptively changes its measurement basis during photon arrival and allows us to validate the detector's performance by tracking the quantum state of the photon source. These results provide an important capability for optical quantum computing, and demonstrate that quantum feedback can both enhance the precision of a detector and enable it to measure new classes of physical observables.

References in corpus (5)

• Charge insensitive qubit design derived from the Cooper pair box
• Amplification and squeezing of quantum noise with a tunable Josephson metamaterial
• Quantum-enhanced optical phase tracking
• Deterministic preparation of superpositions of vacuum plus one photon by adaptive homodyne detection: experimental considerations
• Adaptive homodyne phase discrimination and qubit measurement

Cited by in corpus (16)

• Engineered Dissipation for Quantum Information Science
• Heterodyne Sensing of Microwaves with a Quantum Sensor
• Performance of teleportation-based error correction circuits for bosonic codes with noisy measurements
• Exact quantum sensing limits for bosonic dephasing channels
• Entanglement-Preserving Limit Cycles from Sequential Quantum Measurements and Feedback
• Continuous-variable quantum state designs: theory and applications
• Analysis of spin-squeezing generation in cavity-coupled atomic ensembles with continuous measurements
• Determination of the asymptotic limits of adaptive photon counting measurements for coherent-state optical phase estimation
• Optimal Zeno Dragging for Quantum Control: A Shortcut to Zeno with Action-based Scheduling Optimization
• Efficient qubit phase estimation using adaptive measurements
• How to design quantum-jump trajectories via distinct master equation representations
• An engineering guide to superconducting quantum circuit shielding
• Adaptive Phase Estimation with Squeezed Vacuum Approaching the Quantum Limit
• No-Collapse Accurate Quantum Feedback Control via Conditional State Tomography
• Usefulness of Quantum Entanglement for Enhancing Precision in Frequency Estimation
• Noise-Canceling Quantum Feedback: non-Hermitian Dynamics with Applications to State Preparation and Magic State Distillation