Correcting low-frequency noise with continuous measurement

Abstract

Low-frequency noise presents a serious source of decoherence in solid-state qubits. When combined with a continuous weak measurement of the eigenstates, the low-frequency noise induces a second-order relaxation between the qubit states. Here we show that the relaxation provides a unique approach to calibrate the low-frequency noise in the time-domain. By encoding one qubit with two physical qubits that are alternatively calibrated, quantum logic gates with high fidelity can be performed.

10 pages, 3 figures, submitted

References in corpus (10)

• Mach-Zehnder Interferometry in a Strongly Driven Superconducting Qubit
• Low-frequency noise as a source of dephasing of a qubit
• Non-Gaussian low-frequency noise as a source of qubit decoherence
• Low- and high-frequency noise from coherent two-level systems
• Dephasing of solid-state qubits at optimal points
• Microwave-Induced Cooling of a Superconducting Qubit
• Relaxation and Zeno effect in qubit measurements
• Dynamical suppression of telegraph and 1/f noise due to quantum bistable fluctuator
• Temperature square dependence of the low frequency 1/f charge noise in the Josephson junction qubits
• Quantum two level systems and Kondo-like traps as possible sources of decoherence in superconducting qubits

Cited by in corpus (8)

• Quantum Zeno dynamics: mathematical and physical aspects
• Chaos can act as a decoherence suppressor
• Exact decoherence dynamics of $1/f$ noise
• Protecting Superconducting Qubits with Universal Quantum Degeneracy Point
• Coupling mechanism between microscopic two-level system and superconducting qubits
• Universal Quantum Degeneracy Point for Superconducting Qubits
• Simple theory of the measured current through quantum dots
• Double detected spin-dependent quantum dot