Quantum nondemolition measurements of a qubit

Abstract

The concept of quantum nondemolition (QND) measurement is extended to coherent oscillations in an individual two-state system. Such a measurement enables direct observation of intrinsic spectrum of these oscillations avoiding the detector-induced dephasing that affects the standard (non-QND) measurements. The suggested scheme can be realized in Josephson-junction qubits which combine flux and charge dynamics.

5 pages, 2 figures

References in corpus (3)

• Aharonov-Casher-Effect Suppression of Macroscopic Tunneling of Magnetic Flux
• Radio-frequency Bloch-transistor electrometer
• Shot noise for resonant Cooper pair tunneling

Cited by in corpus (25)

• Squeezing of a nanomechanical resonator by quantum nondemolition measurement and feedback
• Leggett-Garg inequality with a kicked quantum pump
• Qubit feedback and control with kicked quantum nondemolition measurements: A quantum Bayesian analysis
• Rapid Ballistic Readout for Flux Qubits
• Continuous quantum measurement with independent detector cross-correlations
• Quantum Nondemolition Measurement of a Kicked Qubit
• Possible implementation of adiabatic quantum algorithm with superconducting flux qubits
• Spectrum of qubit oscillations from Bloch equations
• Weak and strong measurement of a qubit using a switching-based detector
• Josephson charge-phase qubit with radio frequency readout: coupling and decoherence
• Andreev Probe of Persistent Current States in Superconducting Quantum Circuits
• Quantum nondemolition-like, fast measurement scheme for a superconducting qubit
• Continuous weak measurement and feedback control of a solid-state charge qubit: physical unravelling of non-Lindblad master equation
• Active suppression of dephasing in Josephson-junction qubits
• A model of deterministic detector with dynamical decoherence
• Quantum Nondemolition Squeezing of a Nanomechanical Resonator
• Weak Measurement of Qubit Oscillations with Strong Response Detectors: Violation of the Fundamental Bound Imposed on Linear Detectors
• Non-Markovian dynamics and noise characteristics in continuous measurement of a solid-state charge qubit
• Dynamical localization, measurements and quantum computing
• Scattering Theory of Mesoscopic Detectors
• Wave Function Collapse in a Mesoscopic Device
• Renormalized dynamics in charge qubit measurements by a single electron transistor
• Projective Measurement Scheme for Solid-State Qubits
• Quantum Nondemolition Charge Measurement of a Josephson Qubit
• Quantum Efficiency of Charge Qubit Measurements Using a Single Electron Transistor