Scalable two- and four-qubit parity measurement with a threshold photon counter
arXiv:1502.03340 · doi:10.1103/PhysRevA.92.022335
Abstract
Parity measurement is a central tool to many quantum information processing tasks. In this Letter, we propose a method to directly measure two- and four-qubit parity with low overhead in hard- and software, while remaining robust to experimental imperfections. Our scheme relies on dispersive qubit-cavity coupling and photon counting that is sensitive only to intensity; both ingredients are widely realized in many different quantum computing modalities. For a leading technology in quantum computing, superconducting integrated circuits, we analyze the measurement contrast and the back action of the scheme and show that this measurement comes close enough to an ideal parity measurement to be applicable to quantum error correction.
5 pages + 7 pages supplementary, 4 figures + 2 figures supplementary
References in corpus (10)
- Surface codes: Towards practical large-scale quantum computation
- Strong Coupling of a Spin Ensemble to a Superconducting Resonator
- Observation of quantum jumps in a superconducting artificial atom
- Single-shot qubit readout in circuit Quantum Electrodynamics
- Single-shot qubit readout in circuit Quantum Electrodynamics
- Charge detection enables free-electron quantum computation
- Protocols for optimal readout of qubits using a continuous quantum nondemolition measurement
- Cavity quantum electrodynamics with charge-controlled quantum dots coupled to a fiber Fabry-Perot cavity
- High-fidelity qubit measurement with a microwave photon counter
- Quantum nondemolition-like, fast measurement scheme for a superconducting qubit
Cited by in corpus (12)
- Microwave photonics with superconducting quantum circuits
- Quantum--Classical Interface Based on Single Flux Quantum Digital Logic
- A Fault-Tolerant Honeycomb Memory
- Qubit Parity Measurement by Parametric Driving in Circuit QED
- Entanglement Generated by the Dispersive Interaction: The Dressed Coherent State
- Optimizing single microwave-photon detection: Input-Output theory
- Nonadiabatic corrections to fast dispersive multiqubit gates involving Z control
- Counting statistics of microwave photons in circuit QED
- Three-qubit direct dispersive parity measurement with Tunable Coupling Qubits
- Parity measurement of remote qubits using dispersive coupling and photodetection
- Towards a heralded eigenstate preserving measurement of multi-qubit parity in circuit QED
- Nonlinear Parity Readout with a Microwave Photodetector