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Exponentially Improved Dispersive Qubit Readout with Squeezed Light.

Wei Qin1,2,3, Adam Miranowicz2,4, Franco Nori2,5,6

  • 1Center for Joint Quantum Studies and Department of Physics, School of Science, <a href="https://ror.org/012tb2g32">Tianjin University</a>, Tianjin 300350, China.

Physical Review Letters
|December 23, 2024
PubMed
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This summary is machine-generated.

Combining injected external squeezing (IES) and intracavity squeezing (ICS) exponentially improves signal-to-noise ratio (SNR) for dispersive qubit readout. This breakthrough promises faster, high-fidelity quantum measurements for error correction.

Area of Science:

  • Quantum Information Science
  • Quantum Optics
  • Condensed Matter Physics

Background:

  • Dispersive qubit readout is crucial for quantum computing.
  • Current methods using injected external squeezing (IES) or intracavity squeezing (ICS) alone offer limited signal-to-noise ratio (SNR) improvements.
  • Achieving high-fidelity qubit readout is essential for scalable quantum computation.

Purpose of the Study:

  • To investigate the combined effect of IES and ICS on dispersive qubit readout.
  • To explore methods for significantly enhancing the signal-to-noise ratio (SNR) in qubit measurements.
  • To enable faster and more accurate qubit readout for quantum error correction.

Main Methods:

  • Theoretical analysis of squeezed light (IES and ICS) applied to dispersive qubit readout.

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  • Modeling the signal-to-noise ratio (SNR) as a function of squeezing parameters and measurement time.
  • Evaluating the reduction in measurement error achievable with combined squeezing techniques.

    • Main Results:

    • Counterintuitively, combining IES and ICS leads to an exponential improvement in SNR for any measurement duration.
    • Measurement errors are reduced by orders of magnitude.
    • Short-time measurements show an SNR improvement that scales exponentially with twice the squeezing parameter.

    Conclusions:

    • The synergistic use of IES and ICS offers a powerful strategy for advancing dispersive qubit readout.
    • This approach predicts fast and high-fidelity readout, crucial for quantum error correction.
    • The findings pave the way for practical applications of squeezed light in fault-tolerant quantum computation.