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Area of Science:

  • Quantum Computing
  • Atomic Physics

Background:

  • Scaling quantum processors is challenging due to inherent errors.
  • Quantum error correction requires significant qubit overhead and faces strict error thresholds.
  • Auxiliary spectator qubits offer a complementary approach for in situ noise probing and real-time error correction.

Purpose of the Study:

  • To demonstrate a novel protocol for correcting correlated phase errors in quantum processors using spectator qubits.
  • To establish key tools for scaling neutral-atom quantum processors.

Main Methods:

  • Utilized an array of cesium spectator qubits to monitor and correct errors on an array of rubidium data qubits.
  • Implemented a system combining in-sequence readout, data processing, and feedforward operations for real-time error correction.
  • Developed mid-circuit readout, real-time processing, and coherent mid-circuit qubit reloading techniques for neutral-atom arrays.

Main Results:

  • Successfully suppressed correlated phase errors within the execution of a quantum circuit.
  • Demonstrated the efficacy of spectator qubits in correcting data qubit errors in real-time.
  • Validated the broad applicability of the protocol across different quantum information platforms.

Conclusions:

  • The developed protocol provides a viable strategy for mitigating errors in quantum computing.
  • The established tools are crucial for advancing the scalability of neutral-atom quantum processors.
  • This work offers a promising path towards fault-tolerant quantum computation.