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Related Experiment Video

Updated: May 3, 2026

Gradient Echo Quantum Memory in Warm Atomic Vapor

Gradient Echo Quantum Memory in Warm Atomic Vapor

Published on: November 12, 2013

Stabilizing Rabi oscillations in a superconducting qubit using quantum feedback.

R Vijay¹, C Macklin, D H Slichter

¹Quantum Nanoelectronics Laboratory, Department of Physics, University of California, Berkeley, California 94720, USA. rvijay@berkeley.edu

|October 6, 2012

Summary

This summary is machine-generated.

Researchers used weak quantum measurements to control a superconducting qubit, enabling continuous tracking and steering of its state. This demonstrates quantum feedback control, suppressing decoherence and paving the way for quantum error correction.

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Area of Science:

Quantum Physics
Quantum Computing
Solid-State Systems

Background:

Quantum measurement typically collapses superposition states instantaneously.
Weak measurements allow for gradual state evolution and continuous monitoring.
Quantum feedback control is crucial for managing quantum states and mitigating errors.

Purpose of the Study:

To implement quantum feedback control in a solid-state system.
To demonstrate the suppression of decoherence using weak continuous measurements.
To explore applications in quantum error correction and state stabilization.

Main Methods:

Utilizing a superconducting qubit coupled to a microwave cavity.
Performing weak measurements by probing the cavity with low-photon-number microwave pulses.
Employing a high-bandwidth, quantum-noise-limited amplifier for real-time state monitoring.

Main Results:

Successfully demonstrated quantum feedback control by maintaining Rabi oscillations indefinitely.
Showcased the ability to actively suppress quantum state decay (decoherence).
Achieved high-fidelity, real-time monitoring of the qubit state via cavity measurements.

Conclusions:

Weak continuous measurements enable effective quantum feedback control.
This technique offers a pathway for robust quantum error correction.
Potential applications include quantum state stabilization, purification, and entanglement generation.