Measuring the Decoherence of a Quantronium Qubit with the Cavity Bifurcation Amplifier
arXiv:0706.0765 · doi:10.1103/PhysRevB.76.174516
Abstract
Dispersive readouts for superconducting qubits have the advantage of speed and minimal invasiveness. We have developed such an amplifier, the Cavity Bifurcation Amplifier (CBA) [10], and applied it to the readout of the quantronium qubit [2]. It consists of a Josephson junction embedded in a microwave on-chip resonator. In contrast with the Josephson bifurcation amplifier [17], which has an on-chip capacitor shunting a junction, the resonator is based on a simple coplanar waveguide imposing a pre-determined frequency and whose other RF characteristics like the quality factor are easily controlled and optimized. Under proper microwave irradiation conditions, the CBA has two metastable states. Which state is adopted by the CBA depends on the state of a quantronium qubit coupled to the CBA's junction. Due to the MHz repetition rate and large signal to noise ratio we can show directly that the coherence is limited by 1/f gate charge noise when biased at the sweet spot - a point insensitive to first order gate charge fluctuations. This architecture lends itself to scalable quantum computing using a multi-resonator chip with multiplexed readouts.
arXiv comment6 pages, 5 figures To be published in Physical Review B
References in corpus (15)
- Circuit Quantum Electrodynamics: Coherent Coupling of a Single Photon to a Cooper Pair Box
- Manipulating the Quantum State of an Electrical Circuit
- Resolving photon number states in a superconducting circuit
- Decoherence in a superconducting quantum bit circuit
- Decoherence in Josephson Qubits from Junction Resonances
- An RF-Driven Josephson Bifurcation Amplifier for Quantum Measurements
- Charge echo in a Cooper-pair box
- Dephasing of a superconducting qubit induced by photon noise
- Fabrication and characterization of superconducting circuit QED devices for quantum computation
- Decoherence in Josephson-junction qubits due to critical current fluctuations
- Dispersive measurements of superconducting qubit coherence with a fast, latching readout
- NMR-like control of a quantum bit superconducting circuit
- RF bifurcation of a Josephson junction: microwave embedding circuit requirements
- Flux Qubits and Readout Device with Two Independent Flux Lines
- Coherent control of a flux qubit by phase-shifted resonant microwave pulses
Cited by in corpus (46)
- Circuit Quantum Electrodynamics
- Quantum Error Correction for Quantum Memories
- Microwave photonics with superconducting quantum circuits
- Fluxonium: single Cooper pair circuit free of charge offsets
- Phase preserving amplification near the quantum limit with a Josephson Ring Modulator
- Time-reversal symmetry breaking in circuit-QED based photon lattices
- Single-shot qubit readout in circuit Quantum Electrodynamics
- Single-shot qubit readout in circuit Quantum Electrodynamics
- High-Fidelity Readout in Circuit Quantum Electrodynamics Using the Jaynes-Cummings Nonlinearity
- Study of loss in superconducting coplanar waveguide resonators
- Josephson junction-embedded transmission-line resonators: from Kerr medium to in-line transmon
- Control of microwave signals using circuit nano-electromechanics
- Response of the Strongly-Driven Jaynes-Cummings Oscillator
- Life after charge noise: recent results with transmon qubits
- Circuit QED and engineering charge based superconducting qubits
- Protected Josephson Rhombi Chains
- Single qubit gates in frequency-crowded transmon systems
- Signal-to-pump back-action and self-oscillation in Double-Pump Josephson Parametric Amplifier
- One- and two-photon spectroscopy of a flux qubit coupled to a microscopic defect
- Phase-locking transition in a chirped superconducting Josephson resonator
- Quantum analysis of a nonlinear microwave cavity-embedded dc SQUID displacement detector
- Weak and strong measurement of a qubit using a switching-based detector
- Parametric amplification with weak-link nonlinearity in superconducting microresonators
- Emission spectrum of the driven nonlinear oscillator
- Unconventional rf photoresponse from a superconducting spiral resonator
- Relaxation of a qubit measured by a driven Duffing oscillator
- Switching barrier scaling near bifurcation points for non-Gaussian noise
- Period-doubling-bifurcation readout for a Josephson qubit
- Quantum nondemolition-like, fast measurement scheme for a superconducting qubit
- Cratered Lorentzian response of driven microwave superconducting nanowire-bridged resonators: oscillatory and magnetic-field induced stochastic states
- Spin-Weyl quantum unit: theoretical proposal
- Bifurcation, mode coupling and noise in a nonlinear multimode superconducting RF resonator
- Superconducting phase qubit based on the Josephson oscillator with strong anharmonicity
- Designing dynamically corrected gates robust to multiple noise sources using geometric space curves
- Dissipation in a rotating frame: master equation, effective temperature and Lamb-shift
- Quantum noise properties of multiphoton transitions in driven nonlinear resonators
- Superconducting microwave resonators with non-centrosymmetric nonlinearity
- The dissipative quantum Duffing oscillator: a comparison of Floquet-based approaches
- Coherent Rabi response of a charge-phase qubit under microwave irradiation
- 3D Topological Quantum Computing
- Power-dependent internal loss in Josephson bifurcation amplifiers
- Decoherence in a Pair of Long-Lived Cooper-Pair Boxes
- Semiclassical theory of energy diffusive escape
- Qubit-nonlinear-oscillator systems: from the moderate-coupling limit to the ultrastrong-coupling regime
- Labeling eigenstates of qubit-cavity systems based on the continuity of qubit occupancy: Detecting resonances to higher excited qubit states
- Quantum dynamics of a single fluxon in Josephson junctions parallel arrays with large kinetic inductances