Feedback control of a solid-state qubit using high-fidelity projective measurement

Abstract

We demonstrate feedback control of a superconducting transmon qubit using discrete, projective measurement and conditional coherent driving. Feedback realizes a fast and deterministic qubit reset to a target state with 2.4% error averaged over input superposition states, and cooling of the transmon from 16% spurious excitation to 3%. This closed-loop qubit control is necessary for measurement-based protocols such as quantum error correction and teleportation.

5 pages, 4 figures, and Supplementary Information (5 figures)

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Cited by in corpus (9)

• Confining the state of light to a quantum manifold by engineered two-photon loss
• Detecting bit-flip errors in a logical qubit using stabilizer measurements
• Digital quantum simulation of spin models with circuit quantum electrodynamics
• Demonstrating a Driven Reset Protocol of a Superconducting Qubit
• Quantum limited amplification and entanglement in coupled nonlinear resonators
• Thermal and Residual Excited-State Population in a 3D Transmon Qubit
• Excitation of superconducting qubits from hot non-equilibrium quasiparticles
• Tunable-Cavity QED with Phase Qubits
• Limits of optimal control yields achievable with quantum controllers