Fast Preparation and Detection of a Rydberg Qubit Using Atomic Ensembles

Area of Science:

• Quantum Computing
• Atomic Physics
• Quantum Information Science

Background:

• Atomic Rydberg states are promising for quantum information processing.
• Efficient qubit preparation, manipulation, and readout are crucial for quantum technologies.
• Current methods can be limited by speed and fidelity.

Purpose of the Study:

• To demonstrate a novel, rapid approach for atomic Rydberg-state qubit operations.
• To enhance the speed and fidelity of qubit preparation, manipulation, and readout.
• To explore applications in quantum information processing and error correction.

Main Methods:

• Utilizing Rydberg blockade within a small atomic ensemble.
• Implementing fast qubit preparation (3 μs) and readout (6 μs).
• Employing ensemble-assisted detection for rapid, nondestructive measurements.

Main Results:

• Achieved single qubit preparation with 0.93±0.02 success probability.
• Demonstrated single-shot readout fidelity of 0.92±0.04.
• Observed qubit coherence times of 15 μs, significantly longer than rotation times.

Conclusions:

• The demonstrated method offers a significant speedup for atomic qubit operations.
• Ensemble-assisted detection provides a 10^3 times faster readout than traditional imaging.
• This approach has potential for advancing quantum computing and error correction.