Coherent oscillations inside a quantum manifold stabilized by dissipation

By S. Touzard, A. Grimm, Zaki Leghtas, S. Mundhada, P. Reinhold, R. Heeres, C. Axline, M. Reagor, K. Chou, J. Blumoff and 6 more. 2017

150 citations recorded by the source corpus.

Manipulating the state of a logical quantum bit 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 Schroedinger 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.

Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics

View Paper: https://www.semanticscholar.org/paper/e3119ad41e3535a4f4fd7e15e5e522ab6c6bdf5b

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In Artificial Intelligence

In Atomic and Molecular Physics, and Optics

Citations in the corpus

Widely Tunable On-Chip Microwave Circulator for Superconducting Quantum Circuits (2017, background): “The first demonstrations of operations on single logical qubits [48, 49] were made this year with superconducting circuits.”
Engineered dissipation for quantum information science (2022, background): “They can be combined with the coherent evolution, writing The non-Hermitian effective Hamiltonian, represents the evolution of the system conditioned on no jumps occurring 23,34,35 .”
Fault-tolerant bosonic quantum error correction with the surface–Gottesman-Kitaev-Preskill code (2019, background): “All these codes encode a logical qubit in a physical bosonic oscillator mode and have been realized experimentally in circuit QED [9–14] and trapped ion [15–17] systems in the past few years.”