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Related Experiment Video

Updated: May 3, 2026

Gradient Echo Quantum Memory in Warm Atomic Vapor

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Published on: November 12, 2013

Realization of three-qubit quantum error correction with superconducting circuits.

M D Reed¹, L DiCarlo, S E Nigg

¹Department of Physics, Yale University, New Haven, Connecticut 06520, USA. matthew.reed@yale.edu

|February 3, 2012

Summary

This summary is machine-generated.

Researchers demonstrate quantum error correction using three-qubit codes in superconducting circuits. This method corrects bit-flip and phase-flip errors, paving the way for more robust and scalable quantum computers.

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Area of Science:

Quantum Computing
Quantum Error Correction
Superconducting Circuits

Background:

Quantum computers offer exponential speedups but are prone to errors.
Quantum error correcting codes are essential for maintaining quantum coherence.
Three-qubit codes are the simplest form, encoding one qubit into three.

Purpose of the Study:

To demonstrate phase- and bit-flip error correcting codes in a superconducting circuit.
To implement a three-qubit gate for error correction.
To show first-order insensitivity to errors.

Main Methods:

Encoding a quantum state into a three-qubit entangled state.
Inducing single-qubit errors (bit-flip and phase-flip).
Decoding the error syndrome and applying a corrective three-qubit gate (Toffoli gate).

Main Results:

Achieved 85±1% fidelity for the classical action of the Toffoli gate.
Achieved 78±1% fidelity for the ideal quantum process matrix.
Demonstrated first-order insensitivity to errors, as predicted.

Conclusions:

The implemented three-qubit codes effectively correct single-qubit errors.
This approach shows promise for scalable quantum technology when combined with improved coherence times.
Concatenation of codes on a nine-qubit device could correct arbitrary single-qubit errors.