Adaptive homodyne phase discrimination and qubit measurement
arXiv:0706.2507 · doi:10.1103/PhysRevA.76.052316
Abstract
Fast and accurate measurement is a highly desirable, if not vital, feature of quantum computing architectures. In this work we investigate the usefulness of adaptive measurements in improving the speed and accuracy of qubit measurement. We examine a particular class of quantum computing architectures, ones based on qubits coupled to well controlled harmonic oscillator modes (reminiscent of cavity-QED), where adaptive schemes for measurement are particularly appropriate. In such architectures, qubit measurement is equivalent to phase discrimination for a mode of the electromagnetic field, and we examine adaptive techniques for doing this. In the final section we present a concrete example of applying adaptive measurement to the particularly well-developed circuit-QED architecture.
9 pages, 8 figures. Published version
References in corpus (16)
- Quantum Computation with Quantum Dots
- Circuit Quantum Electrodynamics: Coherent Coupling of a Single Photon to a Cooper Pair Box
- Cavity quantum electrodynamics for superconducting electrical circuits: an architecture for quantum computation
- Coherent control of macroscopic quantum states in a single-Cooper-pair box
- Coherent dynamics of a flux qubit coupled to a harmonic oscillator
- Quantum information processing with circuit quantum electrodynamics
- Quantum Trajectories and Quantum Measurement Theory
- Observation of Faraday rotation from a single confined spin
- Quantum Measurement of a Coupled Nanomechanical Resonator -- Cooper-Pair Box System
- NMR Based Quantum Information Processing: Achievements and Prospects
- Dispersive measurements of superconducting qubit coherence with a fast, latching readout
- Superconducting Qubits Coupled to Nanoelectromechanical Resonators: An Architecture for Solid-State Quantum Information Processing
- Distinguishing between optical coherent states with imperfect detection
- High fidelity measurement and quantum feedback control in circuit QED
- Binary projective measurement via linear optics and photon counting
- Mutual information--based approach to adaptive homodyne detection of quantum optical states