Undoing measurement-induced dephasing in circuit QED
arXiv:1202.2386 · doi:10.1103/PhysRevA.85.052318
Abstract
We analyze the backaction of homodyne detection and photodetection on superconducting qubits in circuit quantum electrodynamics. Although both measurement schemes give rise to backaction in the form of stochastic phase rotations, which leads to dephasing, we show that this can be perfectly undone provided that the measurement signal is fully accounted for. This result improves upon that of Phys. Rev. A, 82, 012329 (2010), showing that the method suggested can be made to realize a perfect two-qubit parity measurement. We propose a benchmarking experiment on a single qubit to demonstrate the method using homodyne detection. By analyzing the limited measurement efficiency of the detector and bandwidth of the amplifier, we show that the parameter values necessary to see the effect are within the limits of existing technology.
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- Experimental demonstration of continuous quantum error correction
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- Feedback Control of Rabi Oscillations in Circuit QED
- Ideal Quantum Nondemolition Readout of a Flux Qubit Without Purcell Limitations
- Theory of remote entanglement via quantum-limited phase-preserving amplification
- Qubit Parity Measurement by Parametric Driving in Circuit QED
- The XYZ hexagonal stabilizer code
- Coherent Feedback Improved Qubit Initialization in the Dispersive Regime
- Characterization of hidden modes in networks of superconducting qubits
- Stochastic Master Equation Analysis of Optimized Three-Qubit Nondemolition Parity Measurement
- Weak-measurement-induced asymmetric dephasing: manifestation of intrinsic measurement chirality
- Confidence and Backaction in the Quantum Filter Equation
- Multi-Qubit Joint Measurements in Circuit QED: Stochastic Master Equation Analysis
- Quantum error correction benchmarks for continuous weak parity measurements
- Parity measurement of remote qubits using dispersive coupling and photodetection
- Towards a heralded eigenstate preserving measurement of multi-qubit parity in circuit QED
- Heralding entangled optical photons from a microwave quantum processor
- Gradual partial-collapse theory for ideal nondemolition measurements of qubits in circuit QED
- Efficient Generation of Multi-partite Entanglement between Non-local Superconducting Qubits using Classical Feedback