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

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Published on: May 30, 2014

A quantum gate between a flying optical photon and a single trapped atom.

Andreas Reiserer¹, Norbert Kalb¹, Gerhard Rempe¹

¹Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Strasse 1, 85748 Garching, Germany.

|April 11, 2014

Summary

Researchers developed a deterministic quantum gate linking trapped atoms and photons. This breakthrough advances quantum communication and computation by enabling robust entanglement between matter and light qubits for scalable quantum networks.

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Area of Science:

Quantum Information Science
Quantum Optics
Atomic Physics

Background:

Quantum technology promises functionalities beyond classical devices.
Quantum communication and computation face scalability challenges.
Hybrid quantum systems with light and matter qubits offer solutions.

Purpose of the Study:

To develop a robust two-qubit gate for linking distant quantum systems.
To enable scalable quantum communication and computation.
To demonstrate a deterministic light-matter quantum gate.

Main Methods:

Utilized a single trapped atom and an optical photon.
Employed a cavity for strong light-matter coupling.
Implemented a gate mechanism based on photon reflection.

Main Results:

Demonstrated a deterministic quantum gate between an atom's spin and a photon's polarization.
Created entangled states including atom-photon, atom-photon-photon, and photon-photon.
Showcased the gate's applicability to various matter qubits.

Conclusions:

The developed quantum gate is robust and deterministic.
This work is crucial for scalable quantum computation and communication.
Potential applications include generating cluster states and enabling photonic Bell-state measurements.