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Logical quantum processor based on reconfigurable atom arrays.

Dolev Bluvstein1, Simon J Evered1, Alexandra A Geim1

  • 1Department of Physics, Harvard University, Cambridge, MA, USA.

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|December 6, 2023
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Summary
This summary is machine-generated.

Researchers developed a programmable quantum processor using encoded logical qubits, significantly improving quantum error correction. This advancement overcomes key challenges in large-scale quantum computing by enhancing gate fidelities and algorithmic performance.

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Area of Science:

  • Quantum Information Science
  • Quantum Computing
  • Quantum Error Correction

Background:

  • Suppressing errors is critical for useful quantum computing, necessitating quantum error correction (QEC).
  • The overhead of error-corrected logical qubits presents a major hurdle for large-scale quantum computation.
  • Existing quantum processors face challenges in achieving high fidelities and scalability for QEC.

Purpose of the Study:

  • To realize a programmable quantum processor utilizing encoded logical qubits.
  • To demonstrate improved quantum error correction capabilities and algorithmic performance.
  • To overcome the overhead challenges associated with logical qubit realization.

Main Methods:

  • Development of a programmable quantum processor with up to 280 physical qubits using neutral-atom arrays.
  • Implementation of logical-level control, zoned architecture, and arbitrary connectivity.
  • Utilization of various encoding schemes, including surface codes and color codes, for error correction.

Main Results:

  • Demonstrated improvement in two-qubit gate fidelity by scaling surface code distance.
  • Achieved break-even fidelities for color-code qubits and fault-tolerant creation of logical GHZ states.
  • Successfully executed complex sampling circuits with up to 48 logical qubits, outperforming physical qubit fidelities.

Conclusions:

  • The developed logical quantum processor significantly enhances algorithmic performance with error detection.
  • This work marks a significant step towards early error-corrected quantum computation.
  • The findings provide a clear pathway for the development of large-scale logical quantum processors.