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All-optical quantum information processing using Rydberg gates.

D Paredes-Barato1, C S Adams1

  • 1Joint Quantum Centre (JQC) Durham-Newcastle, Department of Physics, Durham University, Rochester Building, South Road, Durham DH1 3LE, United Kingdom.

Physical Review Letters
|March 4, 2014
PubMed
Summary
This summary is machine-generated.

We present a hybrid quantum computing scheme for a photonic controlled-Z (CZ) gate using Rydberg states. This method enhances photon-photon interactions for high-fidelity quantum operations.

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Area of Science:

  • Quantum computing
  • Quantum optics
  • Atomic physics

Background:

  • Implementing quantum gates is crucial for building quantum computers.
  • Photonic gates face challenges with photon-photon interactions and loss.
  • Rydberg states offer strong interactions but require precise control.

Purpose of the Study:

  • To propose a novel hybrid scheme for a photonic controlled-Z (CZ) gate.
  • To leverage Rydberg states and microwave fields for controlled photon-photon interactions.
  • To minimize loss and mode distortion in photonic quantum gates.

Main Methods:

  • Utilizing photon storage in highly excited Rydberg states.
  • Employing resonant microwave fields to control interactions.
  • Exploiting the spatial properties of the dipole blockade phenomenon.

Main Results:

  • Achieved fidelities exceeding 95% when excluding coupling efficiency.
  • Demonstrated decoupling of light propagation from interaction.
  • Identified motional dephasing and finite Rydberg level lifetime as primary limitations.

Conclusions:

  • The proposed hybrid scheme offers a promising route to high-fidelity photonic CZ gates.
  • The method effectively controls photon-photon interactions using Rydberg states and microwave fields.
  • Further improvements can be made by mitigating motional dephasing and enhancing Rydberg state lifetimes.