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Speeding Up Quantum Measurement Using Space-Time Trade-Off.

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We developed a quantum measurement acceleration scheme using ancillary systems. This approach enhances readout speed and is robust against experimental errors, benefiting quantum error correction.

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Area of Science:

  • Quantum Information Science
  • Quantum Computing
  • Quantum Measurement

Background:

  • Quantum measurement speed is critical for quantum computing.
  • Current protocols often involve entangling systems with ancilla.
  • Limitations exist in idealized scenarios and robustness against noise.

Purpose of the Study:

  • To present a novel scheme for accelerating quantum measurement.
  • To investigate the scheme's robustness against experimental imperfections.
  • To provide a hardware-agnostic method for enhancing quantum technology platforms.

Main Methods:

  • Developing a protocol that entangles the system to be measured with ancillary systems.
  • Performing numerical modeling to simulate gate noise and readout errors.
  • Analyzing the space-time trade-off in idealized and realistic conditions.

Main Results:

  • Demonstrated a linear increase in readout speed with the number of ancilla in idealized conditions.
  • Verified scheme robustness against gate noise and readout errors through numerical simulations.
  • Observed potential for better-than-linear speed improvement under specific circumstances.

Conclusions:

  • The proposed scheme effectively speeds up quantum measurement.
  • The approach is robust against common experimental imperfections.
  • This method is broadly applicable and crucial for accelerating midcircuit measurements in quantum error correction.