Coherent Oscillations inside a Quantum Manifold Stabilized by Dissipation

Manipulating the state of a logical quantum bit (qubit) usually comes at the expense of exposing it to decoherence. Fault-tolerant quantum computing tackles this problem by manipulating quantum information within a stable manifold of a larger Hilbert space, whose symmetries restrict the number of in...

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Published inPhysical review. X Vol. 8; no. 2; p. 021005
Main Authors Touzard, S., Grimm, A., Leghtas, Z., Mundhada, S. O., Reinhold, P., Axline, C., Reagor, M., Chou, K., Blumoff, J., Sliwa, K. M., Shankar, S., Frunzio, L., Schoelkopf, R. J., Mirrahimi, M., Devoret, M. H.
Format Journal Article
LanguageEnglish
Published College Park American Physical Society 04.04.2018
Subjects
Coherence
Damping
Electromagnetic fields
Error correction
Fault tolerance
Hilbert space
Manifolds
Mathematical Physics
Mathematics
Mechanical systems
Oscillations
Quantum computers
Quantum computing
Quantum mechanics
Quantum phenomena
Qubits (quantum computing)
Shock absorbers
Stability
Stabilization
Superconductivity
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Summary:Manipulating the state of a logical quantum bit (qubit) usually comes at the expense of exposing it to decoherence. Fault-tolerant quantum computing tackles this problem by manipulating quantum information within a stable manifold of a larger Hilbert space, whose symmetries restrict the number of independent errors. The remaining errors do not affect the quantum computation and are correctable after the fact. Here we implement the autonomous stabilization of an encoding manifold spanned by Schrödinger cat states in a superconducting cavity. We show Zeno-driven coherent oscillations between these states analogous to the Rabi rotation of a qubit protected against phase flips. Such gates are compatible with quantum error correction and hence are crucial for fault-tolerant logical qubits.
ISSN:2160-3308
2160-3308
DOI:10.1103/PhysRevX.8.021005