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Related Experiment Video

Updated: Nov 18, 2025

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Published on: May 30, 2014

Protecting a bosonic qubit with autonomous quantum error correction.

Jeffrey M Gertler¹, Brian Baker², Juliang Li¹

¹Department of Physics, University of Massachusetts Amherst, Amherst, MA, USA.

|February 11, 2021

Summary

This summary is machine-generated.

Researchers demonstrate a new passive quantum error correction (QEC) method using tailored dissipation. This approach autonomously corrects errors in superconducting qubits, enhancing coherence times and offering a resource-efficient path for quantum computing.

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Area of Science:

Quantum Computing
Quantum Information Science
Quantum Error Correction

Background:

Building a universal quantum computer requires effective quantum error correction (QEC).
Current QEC methods rely on active error-syndrome measurements and adaptive operations, which are hardware-intensive and can introduce errors.
Achieving autonomous QEC through tailored dissipation has been a significant challenge.

Purpose of the Study:

To demonstrate a passive quantum error correction protocol using engineered dissipation.
To stabilize an error-syndrome operator, specifically photon number parity, in a superconducting cavity.
To protect quantum information and enhance the coherence time of a bosonic qubit.

Main Methods:

Encoding a logical qubit in Schrödinger cat-like multiphoton states within a superconducting cavity.
Implementing a corrective dissipation process using continuous-wave control fields.
Utilizing passive error correction without high-fidelity readout or fast digital feedback.

Main Results:

Demonstrated a passive protocol that autonomously corrects single-photon-loss errors.
Boosted the coherence time of the bosonic qubit by over a factor of two.
Achieved QEC in a modest hardware setup, contrasting with previous sophisticated requirements.

Conclusions:

Engineered quantum dissipation offers a resource-efficient alternative or supplement to active QEC.
This passive approach is compatible with other fault-tolerant techniques for future quantum computing architectures.
The demonstrated method simplifies hardware requirements for implementing QEC.