Speeding Up Quantum Measurement Using Space-Time Trade-Off

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.