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Heteronuclear single-quantum correlation spectroscopy (HSQC) is a 2D NMR technique that reveals one-bond correlations between hydrogen and a heteronucleus. The HSQC experiment is similar to the heteronuclear correlation experiment (HETCOR) but is more sensitive. In the HSQC spectrum, the proton chemical shift is plotted on the horizontal F2 axis, while the 13C chemical shift is plotted on the vertical F1 axis. The corresponding proton and 13C spectra are also shown. The HSQC contour plot does...
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Power of Sequential Protocols in Hidden Quantum Channel Discrimination.

Sho Sugiura1,2, Arkopal Dutt3, William J Munro4,5

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|July 1, 2024
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Summary
This summary is machine-generated.

Sequential quantum channel discrimination (QCD) protocols perfectly identify unknown quantum channels acting on hidden systems. Other methods fail, highlighting sequential approaches as superior for realistic quantum experiments.

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Area of Science:

  • Quantum Information Science
  • Quantum Control and Measurement

Background:

  • Many systems involve unknown quantum channels interacting with inaccessible subsystems.
  • Learning these hidden quantum channels requires indirect methods via interacting controllable subsystems.

Purpose of the Study:

  • To investigate quantum channel discrimination (QCD) under constraints of hidden systems.
  • To compare the efficacy of different protocols for hidden system QCD.

Main Methods:

  • Analysis of sequential, depth-1 parallel, and multishot protocols for hidden system QCD.
  • Theoretical investigation of discrimination capabilities and performance limits.

Main Results:

  • Sequential protocols achieve perfect discrimination of hidden quantum channels.
  • Sequential protocols saturate the Heisenberg limit, indicating optimal precision.
  • Depth-1 parallel and multishot protocols are insufficient for solving hidden system QCD.

Conclusions:

  • Sequential protocols demonstrate superior performance for hidden system quantum channel discrimination.
  • The findings suggest sequential strategies are more practical for experimental quantum information processing.