Fast readout of a single Cooper-pair box using its quantum capacitance

Abstract

We have fabricated a single Cooper-pair box (SCB) together with an on-chip lumped element resonator. By utilizing the quantum capacitance of the SCB, its state can be read out by detecting the phase of a radio-frequency (rf) signal reflected off the resonator. The resonator was optimized for fast readout. By studying quasiparticle tunneling events in the SCB, we have characterized the performance of the readout and found that we can perform a single shot parity measurement in approximately 50 ns. This is an order of magnitude faster than previously reported measurements.

7 pages, 5 figures

References in corpus (20)

• Charge insensitive qubit design derived from the Cooper pair box
• Quantum state engineering with Josephson-junction devices
• Coherent control of macroscopic quantum states in a single-Cooper-pair box
• Manipulating the Quantum State of an Electrical Circuit
• Decoherence in Josephson Qubits from Dielectric Loss
• Nonequilibrium quasiparticles and $2e$ periodicity in single-Cooper-pair transistors
• Coherence times of dressed states of a superconducting qubit under extreme driving
• Observation of quantum capacitance in the Cooper-pair transistor
• Direct Observation of Josephson Capacitance
• Kinetics of non-equilibrium quasiparticle tunneling in superconducting charge qubits
• Dressed Relaxation and Dephasing in a Strongly Driven Two-Level system
• An ultra sensitive radio frequency single electron transistor working up to 4.2 K
• Microsecond resolution of quasiparticle tunneling in the single-Cooper-pair-transistor
• Time-domain measurements of quasiparticle tunneling rates in a single-Cooper-pair transistor
• Quasiparticle number fluctuations in superconductors
• Excess dissipation in a single-electron box: The Sisyphus resistance
• Fast quantum limited read-out of a superconducting qubit using a slow oscillator
• The Quantum Capacitance Detector: A concept for a pair-breaking radiation detector based on the single Cooper-pair box
• Kinetics of quasiparticle trapping in a Cooper-pair box
• Characterization of an entangled system of two superconducting qubits using a multiplexed capacitance readout

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• Coexistence of multi-photon processes and longitudinal couplings in superconducting flux qubits
• Inverse Landau-Zener-Stuckelberg problem for qubit-resonator systems
• From adiabatic to dispersive readout of quantum circuits
• Small-signal equivalent circuit for double quantum dots at low-frequencies
• Thermal properties of charge noise sources
• Single Cooper-pair pumping in the adiabatic limit and beyond
• Design of a Cooper pair box electrometer for application to solid-state and astroparticle physics
• On the paradoxical evolution of the number of photons in a new model of interpolating Hamiltonians
• Charge sensitivity of a cavity-embedded Cooper pair transistor limited by single-photon shot noise