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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

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Storage and control of optical photons using Rydberg polaritons.

D Maxwell¹, D J Szwer, D Paredes-Barato

¹Joint Quantum Centre Durham-Newcastle, Department of Physics, Durham University, Rochester Building, South Road, Durham DH1 3LE, United Kingdom. daniel.maxwell@durham.ac.uk

Physical Review Letters

|March 26, 2013

Summary

We control optical photons using microwave fields in cold atoms. This allows for tunable photon-photon interactions, useful for quantum simulations and networks.

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Area of Science:

Quantum optics
Atomic physics
Quantum information science

Background:

Controlling quantum states of light is crucial for quantum technologies.
Interactions between photons are typically weak, hindering quantum information processing.
Rydberg states in atoms offer strong interactions but are challenging to interface with photons.

Purpose of the Study:

To demonstrate control over optical photons using microwave fields.
To enable tunable photon-photon interactions via Rydberg polaritons.
To establish a microwave-optical interface for quantum applications.

Main Methods:

Storing optical photons in a cold atomic cloud using Rydberg polaritons.
Applying a microwave field to manipulate the collective quantum state of the polaritons.
Performing collective readout to observe changes in polariton interactions.

Main Results:

Microwave fields successfully controlled the quantum state of stored optical photons.
Rydberg polaritons enabled fast qubit rotations and controlled photon-photon interactions.
Collective readout confirmed that the microwave field modifies long-range polariton interactions.

Conclusions:

A novel technique for interfacing microwave and optical domains using Rydberg polaritons has been developed.
This method allows for tunable control over photon-photon interactions.
Potential applications include quantum simulations, metrology, and quantum networks.