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Site-Selective Cavity Readout and Classical Error Correction of a 5-Bit Atomic Register
Beili Hu1, Josiah Sinclair1, Edita Bytyqi1
1Massachusetts Institute of Technology, Department of Physics, MIT-Harvard Center for Ultracold Atoms and Research Laboratory of Electronics, Cambridge, Massachusetts 02139, USA.
Physical Review Letters
|April 11, 2025
Summary
Researchers developed a method for high-fidelity readout of atomic qubits in an array using optical cavities. This technique enables site-selective state detection and demonstrates improved error correction for scalable quantum computing.
Area of Science:
- Quantum Information Science
- Atomic Physics
- Optical Cavity Technology
Background:
- Optical cavities offer fast, nondestructive readout of atomic qubits.
- Scaling up atomic qubit arrays for quantum computing presents significant challenges.
Purpose of the Study:
- To demonstrate site-selective hyperfine-state cavity readout in a ten-site atomic array.
- To improve the scalability and error correction capabilities of atomic quantum systems.
Main Methods:
- Utilized locally addressed excited-state Stark shifts to tune atoms out of resonance.
- Implemented adaptive search strategies for faster array readout.
- Demonstrated repeated rounds of classical error correction.
Main Results:
- Achieved site-selective hyperfine-state cavity readout with high fidelity (0.994(1) for single atom, 0.989(2) for array).
- Demonstrated exponential suppression of logical error and extended logical memory fivefold.
- Showcased adaptive search strategies for efficient array readout.
Conclusions:
- Site-selective cavity readout is a viable method for scaling atomic qubit arrays.
- Advanced error correction techniques significantly enhance the performance and reliability of quantum systems.
- This work paves the way for more robust and scalable atomic quantum computing architectures.
