Single-Shot Conditional Displacement Gate between a Trapped Atom and Traveling Light

Area of Science:

• Quantum Information Science
• Atomic Physics
• Quantum Optics

Background:

• Hybrid quantum systems require robust methods for interfacing stationary qubits (like trapped atoms) with itinerant qubits (like photons).
• Implementing universal quantum control necessitates efficient and reliable quantum gates.

Purpose of the Study:

• To propose and theoretically analyze a single-shot conditional displacement gate.
• To enable coherent linking between trapped atoms and traveling light pulses for quantum information processing.

Main Methods:

• Utilizing a trapped atom as a control qubit and a traveling light pulse as a target oscillator.
• Employing an optical cavity to mediate the interaction.
• Implementing synchronized classical driving of the atom with light reflection for single-shot operation.

Main Results:

• A single-shot conditional displacement gate is proposed.
• A concise gate model is derived, accounting for cavity loss and atomic decay.
• The model facilitates gate performance evaluation and optimization.

Conclusions:

• The proposed gate provides a practical tool for coherently connecting stationary atoms and itinerant light.
• This is a crucial capability for advancing hybrid quantum information processing architectures.