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Quantum capacities of transducers.

Chiao-Hsuan Wang1,2,3,4, Fangxin Li5, Liang Jiang5

  • 1Department of Physics and Center for Theoretical Physics, National Taiwan University, Taipei, 10617, Taiwan. chiaowang@phys.ntu.edu.tw.

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Quantum transducers are crucial for quantum technologies. This study introduces quantum capacity as a unified metric, finding maximally flat designs optimize performance under coupling constraints.

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Area of Science:

  • Quantum Information Science
  • Quantum Engineering
  • Optics and Photonics

Background:

  • High-performance quantum transducers are vital for quantum science and technology, enabling information transfer between different physical systems.
  • Current characterization relies on multiple figures of merit like efficiency, bandwidth, and added noise, lacking a unified approach.
  • Quantum capacity offers a single metric representing the maximum qubit communication rate, ideal for unifying transducer performance evaluation.

Purpose of the Study:

  • To define a unified metric for quantum transducer performance using quantum capacity.
  • To investigate optimal transducer designs for maximizing quantum capacity under realistic physical constraints.
  • To analyze the impact of thermal noise on transducer performance.

Main Methods:

  • Utilized continuous-time quantum capacities of bosonic pure-loss channels as benchmarks.
  • Investigated generic quantum transduction schemes modeled as external signals transmitted through coupled bosonic chains.
  • Analyzed the relationship between transducer design (conversion frequency response) and achievable quantum capacity.

Main Results:

  • A maximally flat conversion frequency response, akin to Butterworth electric filters, maximizes quantum capacity under constraints on the coupling rate.
  • The study establishes a direct link between transducer design principles and the unified quantum capacity metric.
  • The detrimental effects of thermal noise on transducer performance were further investigated.

Conclusions:

  • Quantum capacity provides a comprehensive metric for evaluating quantum transducers.
  • Optimized transducer designs, specifically those with maximally flat responses, are key to achieving high performance.
  • Understanding and mitigating noise are crucial for practical quantum transduction applications.