High-Fidelity Readout in Circuit Quantum Electrodynamics Using the Jaynes-Cummings Nonlinearity
arXiv:1004.4323 · doi:10.1103/PhysRevLett.105.173601
Abstract
We demonstrate a qubit readout scheme that exploits the Jaynes-Cummings nonlinearity of a superconducting cavity coupled to transmon qubits. We find that in the strongly-driven dispersive regime of this system, there is the unexpected onset of a high-transmission "bright" state at a critical power which depends sensitively on the initial qubit state. A simple and robust measurement protocol exploiting this effect achieves a single-shot fidelity of 87% using a conventional sample design and experimental setup, and at least 61% fidelity to joint correlations of three qubits.
5 pages, 4 figures
References in corpus (20)
- Demonstration of Two-Qubit Algorithms with a Superconducting Quantum Processor
- Approaching Unit Visibility for Control of a Superconducting Qubit with Dispersive Readout
- Suppressing Charge Noise Decoherence in Superconducting Charge Qubits
- Climbing the Jaynes-Cummings Ladder and Observing its Sqrt(n) Nonlinearity in a Cavity QED System
- Controlling the spontaneous emission of a superconducting transmon qubit
- Quantum Non-demolition Detection of Single Microwave Photons in a Circuit
- Dispersive regime of circuit QED: photon-dependent qubit dephasing and relaxation rates
- Nonlinear response of the vacuum Rabi resonance
- Single-shot qubit readout in circuit Quantum Electrodynamics
- Single-shot qubit readout in circuit Quantum Electrodynamics
- Fast Reset and Suppressing Spontaneous Emission of a Superconducting Qubit
- Randomized benchmarking and process tomography for gate errors in a solid-state qubit
- State tomography of capacitively shunted phase qubits with high fidelity
- Nonlinear spectroscopy of photons bound to one atom
- Two-Qubit State Tomography using a Joint Dispersive Read-Out
- Protocols for optimal readout of qubits using a continuous quantum nondemolition measurement
- Improved Superconducting Qubit Readout by Qubit-Induced Nonlinearities
- Response of the Strongly-Driven Jaynes-Cummings Oscillator
- Non-linear dispersive regime of cavity QED: The dressed dephasing model
- Measuring the Decoherence of a Quantronium Qubit with the Cavity Bifurcation Amplifier