Theory of measurement crosstalk in superconducting phase qubits

Abstract

We analyze the crosstalk error mechanism in measurement of two capacitively coupled superconducting flux-biased phase qubits. The damped oscillations of the superconducting phase after the measurement of the first qubit may significantly excite the second qubit, leading to its measurement error. The first qubit, which is highly excited after the measurement, is described classically. The second qubit is treated both classically and quantum-mechanically. The results of the analysis are used to find the upper limit for the coupling capacitance (thus limiting the frequency of two-qubit operations) for a given tolerable value of the measurement error probability.

16 pages, Revtex; minor changes in the text and figures

References in corpus (5)

• Approaching Unit Visibility for Control of a Superconducting Qubit with Dispersive Readout
• Mach-Zehnder Interferometry in a Strongly Driven Superconducting Qubit
• State tomography of capacitively shunted phase qubits with high fidelity
• Coherent control of a flux qubit by phase-shifted resonant microwave pulses
• Analysis of measurement errors for a superconducting phase qubit

Cited by in corpus (18)

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• Compressed sensing quantum process tomography for superconducting quantum gates
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• Measurement crosstalk between two phase qubits coupled by a coplanar waveguide
• Two-qubit decoherence mechanisms revealed via quantum process tomography
• Multi-photon spectroscopy of a hybrid quantum system
• Tunable-Cavity QED with Phase Qubits
• Analysis of a tuneable coupler for superconducting phase qubits
• Observation of Anomalous Josephson Effect in Nonequilibrium Andreev Interferometers
• Analysis of Bell inequality violation in superconducting qubits
• Discriminating the Phase of a Coherent Tone with a Flux-Switchable Superconducting Circuit
• Atomic delocalisation as a microscopic origin of two-level defects in Josephson junctions
• Quantum state engineering with flux-biased Josephson phase qubits by Stark-chirped rapid adiabatic passages
• Single-step controlled-NOT logic from any exchange interaction
• Effects of decoherence and errors on Bell-inequality violation
• Fine tuning of phase qubit parameters for optimization of fast single-pulse readout
• Hybrid Quantum Interferometer in Bifurcation Mode as a Latching Quantum Readout
• Non-demolition Adiabatic Measurement of the Phase Qubit State