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Fast accurate state measurement with superconducting qubits.

Evan Jeffrey1, Daniel Sank1, J Y Mutus1

  • 1Department of Physics, University of California, Santa Barbara, California 93106-9530, USA.

Physical Review Letters
|June 1, 2014
PubMed
Summary

We developed a fast, accurate superconducting qubit measurement system. This enables simultaneous measurement of four qubits, crucial for advancing quantum computing and error correction.

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Area of Science:

  • Quantum Computing
  • Superconducting Circuits

Background:

  • Advancements in superconducting qubit experiments necessitate faster and more accurate state measurement techniques.
  • Scaling up qubit systems and implementing advanced control methods like feedback require improved measurement capabilities.

Purpose of the Study:

  • To design and demonstrate a multiplexed measurement system for fast and accurate superconducting qubit state detection.
  • To enable simultaneous measurement of multiple qubits on a single integrated circuit without compromising qubit coherence.

Main Methods:

  • Development of a multiplexed measurement system incorporating a bandpass filter.
  • Integration of the system with a superconducting integrated circuit for multi-qubit experiments.
  • Experimental demonstration of simultaneous measurement of four superconducting qubits.

Main Results:

  • Achieved simultaneous measurement of four qubits on a single superconducting integrated circuit.
  • Demonstrated a measurement accuracy of 99.8% for the fastest qubit within 140 nanoseconds.
  • The developed system minimizes environmental damping, preserving qubit states.

Conclusions:

  • The achieved speed and accuracy of the measurement system are sufficient for advanced multiqubit experiments.
  • This technology is suitable for implementing sophisticated quantum error correction codes, such as surface codes.
  • The multiplexed measurement system represents a significant step forward for scalable and high-performance quantum computing.