Tunable joint measurements in the dispersive regime of cavity QED

Abstract

Joint measurements of multiple qubits have been shown to open new possibilities for quantum information processing. Here, we present an approach based on homodyne detection to realize such measurements in the dispersive regime of cavity/circuit QED. By changing details of the measurement, the readout can be tuned from extracting only single-qubit to only multi-qubit properties. We obtain a reduced stochastic master equation describing this measurement and its effect on the qubits. As an example, we present results showing parity measurements of two qubits. In this situation, measurement of an initially unentangled state can yield with near unit probability a state of significant concurrence.

4 pages, 4 figures

References in corpus (18)

• Demonstration of Two-Qubit Algorithms with a Superconducting Quantum Processor
• Quantum information processing with circuit quantum electrodynamics
• Amplification and squeezing of quantum noise with a tunable Josephson metamaterial
• Controlling the spontaneous emission of a superconducting transmon qubit
• State-independent experimental test of quantum contextuality
• Experimental joint weak measurement on a photon pair as a probe of Hardy's Paradox
• Dispersive regime of circuit QED: photon-dependent qubit dephasing and relaxation rates
• Quantum trajectory approach to circuit QED: Quantum jumps and the Zeno effect
• Ultrastrong coupling regime of cavity QED with phase-biased flux qubits
• Charge detection enables free-electron quantum computation
• Two-Qubit State Tomography using a Joint Dispersive Read-Out
• Parity meter for charge qubits: an efficient quantum entangler
• Proposal for generating and detecting multi-qubit GHZ states in circuit QED
• Physical model of continuous two-qubit parity measurement in a cavity-QED network
• Entanglement genesis under continuous parity measurement
• Weak non-linearities and cluster states
• Weak measurement and control of entanglement generation
• Entanglement of superconducting charge qubits by homodyne measurement

Cited by in corpus (54)

• Circuit Quantum Electrodynamics
• Quantum Error Correction for Quantum Memories
• Microwave photonics with superconducting quantum circuits
• Stabilizing entanglement autonomously between two superconducting qubits
• Deterministic entanglement of superconducting qubits by parity measurement and feedback
• Observation of measurement-induced entanglement and quantum trajectories of remote superconducting qubits
• Feedback control of a solid-state qubit using high-fidelity projective measurement
• Fast quantum non-demolition readout from longitudinal qubit-oscillator interaction
• Demonstration of entanglement-by-measurement of solid state qubits
• Initialization by measurement of a two-qubit superconducting circuit
• Two-mode back-action-evading measurements in cavity optomechanics
• A Parity-Protected Superconductor-Semiconductor Qubit
• Entanglement Stabilization using Parity Detection and Real-Time Feedback in Superconducting Circuits
• A Fault-Tolerant Honeycomb Memory
• Reversing quantum trajectories with analog feedback
• Comparing and combining measurement-based and driven-dissipative entanglement stabilization
• Experimental demonstration of continuous quantum error correction
• Relaxing Hardware Requirements for Surface Code Circuits using Time-dynamics
• Entanglement genesis by ancilla-based parity measurement in 2D circuit QED
• Dispersive Qubit Measurement by Interferometry with Parametric Amplifiers
• Reservoir Computing Approach to Quantum State Measurement
• Feedback Control of Rabi Oscillations in Circuit QED
• Stabilizer quantum error correction toolbox for superconducting qubits
• High fidelity feed-back assisted parity measurement in circuit QED
• Multi-qubit parity measurement in circuit quantum electrodynamics
• Quantum trajectories and their statistics for remotely entangled quantum bits
• Quantum entanglement distribution with hybrid parity gate
• Qubit Parity Measurement by Parametric Driving in Circuit QED
• Theory of remote entanglement via quantum-limited phase-preserving amplification
• Undoing measurement-induced dephasing in circuit QED
• Bridging the gap between the Jaynes-Cummings and Rabi models using an intermediate rotating wave approximation
• Quantum-limited measurement of spin qubits via curvature coupling to a cavity
• Generation and stabilization of a three-qubit entangled W state in circuit QED via quantum feedback control
• Benchmarking the readout of a superconducting qubit for repeated measurements
• The XYZ${}^2$ hexagonal stabilizer code
• Modulated longitudinal gates on encoded spin-qubits via curvature couplings to a superconducting cavity
• Adiabatic Elimination of Gaussian Subsystems from Quantum Dynamics under Continuous Measurement
• Stochastic Master Equation Analysis of Optimized Three-Qubit Nondemolition Parity Measurement
• Always-On Quantum Error Tracking with Continuous Parity Measurements
• Fermion-Parity-Based Computation and its Majorana-Zero-Mode Implementation
• On-demand maximally entangled states with a parity meter and continuous feedback
• Supercurrent parity-meter in a nanowire Cooper-pair transistor
• Three-qubit direct dispersive parity measurement with Tunable Coupling Qubits
• 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
• Measurement-induced entanglement of two transmon qubits by a single photon
• Towards a heralded eigenstate preserving measurement of multi-qubit parity in circuit QED
• Entanglement of two non-interacting qubits via a mesoscopic system
• Single-shot energetic-based estimator for entanglement in a half-parity measurement setup
• Flying-cat parity checks for quantum error correction
• Controllable coupling and quantum correlation dynamics of two double quantum dots coupled via a transmission line resonator
• Measurement-Based Entanglement of Semiconductor Spin Qubits
• Exploring the Fidelity of Flux Qubit Measurement in Different Bases via the Quantum Flux Parametron