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Time-reversal-symmetric single-photon wave packets for free-space quantum communication.

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This study introduces new methods for efficient quantum state transfer between matter qubits and photonic qubits. These techniques enable high-fidelity, on-demand quantum communication without specialized optical equipment.

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Area of Science:

  • Quantum Information Science
  • Atomic, Molecular, and Optical Physics

Background:

  • Quantum state transfer is crucial for quantum computing and communication.
  • Efficiently transferring quantum states between different physical systems remains a challenge.

Purpose of the Study:

  • To propose novel readout and retrieval processes for high-fidelity quantum state transfer.
  • To enable efficient quantum communication protocols in free space.

Main Methods:

  • Utilizing stimulated Raman adiabatic passage to control spontaneous photon emission and absorption.
  • Encoding matter qubits in atomic/ionic level structures and photonic qubits in single-photon wave packets.

Main Results:

  • Demonstrated efficient, high-fidelity quantum state transfer between matter and photonic qubits.
  • Developed on-demand control over photon emission and absorption.

Conclusions:

  • The proposed methods offer a promising approach for building blocks in free-space quantum communication.
  • Eliminates the need for high-finesse cavities or optical fibers for quantum state transfer.