Improving application performance with biased distributions of quantum states
Abstract
We consider the properties of a specific distribution of mixed quantum states of arbitrary dimension that can be biased towards a specific mean purity. In particular, we analyze mixtures of Haar-random pure states with Dirichlet-distributed coefficients. We analytically derive the concentration parameters required to match the mean purity of the Bures and Hilbert–Schmidt distributions in any dimension. Numerical simulations suggest that this value recovers the Hilbert–Schmidt distribution exactly, offering an alternative and intuitive physical interpretation for ensembles of Hilbert–Schmidt-distributed random quantum states. We then demonstrate how substituting these Dirichlet-weighted Haar mixtures in place of the Bures and Hilbert–Schmidt distributions results in measurable performance advantages in machine-learning-based quantum state tomography systems and Bayesian quantum state reconstruction. Finally, we experimentally characterize the distribution of quantum states generated by both a cloud-accessed IBM quantum computer and an in-house source of polarization-entangled photons. In each case, our method can more closely match the underlying distribution than either Bures or Hilbert–Schmidt distributed states for various experimental conditions.
- Authors:
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE; US Army Research Office (ARO)
- OSTI Identifier:
- 1832932
- Alternate Identifier(s):
- OSTI ID: 1833950
- Grant/Contract Number:
- AC05-00OR22725; W911NF-19-2-0087; W911NF-20-2-0168
- Resource Type:
- Published Article
- Journal Name:
- Physical Review Research
- Additional Journal Information:
- Journal Name: Physical Review Research Journal Volume: 3 Journal Issue: 4; Journal ID: ISSN 2643-1564
- Publisher:
- American Physical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; quantum computation; quantum information processing
Citation Formats
Lohani, Sanjaya, Lukens, Joseph M., Jones, Daniel E., Searles, Thomas A., Glasser, Ryan T., and Kirby, Brian T. Improving application performance with biased distributions of quantum states. United States: N. p., 2021.
Web. doi:10.1103/PhysRevResearch.3.043145.
Lohani, Sanjaya, Lukens, Joseph M., Jones, Daniel E., Searles, Thomas A., Glasser, Ryan T., & Kirby, Brian T. Improving application performance with biased distributions of quantum states. United States. https://doi.org/10.1103/PhysRevResearch.3.043145
Lohani, Sanjaya, Lukens, Joseph M., Jones, Daniel E., Searles, Thomas A., Glasser, Ryan T., and Kirby, Brian T. Mon .
"Improving application performance with biased distributions of quantum states". United States. https://doi.org/10.1103/PhysRevResearch.3.043145.
@article{osti_1832932,
title = {Improving application performance with biased distributions of quantum states},
author = {Lohani, Sanjaya and Lukens, Joseph M. and Jones, Daniel E. and Searles, Thomas A. and Glasser, Ryan T. and Kirby, Brian T.},
abstractNote = {We consider the properties of a specific distribution of mixed quantum states of arbitrary dimension that can be biased towards a specific mean purity. In particular, we analyze mixtures of Haar-random pure states with Dirichlet-distributed coefficients. We analytically derive the concentration parameters required to match the mean purity of the Bures and Hilbert–Schmidt distributions in any dimension. Numerical simulations suggest that this value recovers the Hilbert–Schmidt distribution exactly, offering an alternative and intuitive physical interpretation for ensembles of Hilbert–Schmidt-distributed random quantum states. We then demonstrate how substituting these Dirichlet-weighted Haar mixtures in place of the Bures and Hilbert–Schmidt distributions results in measurable performance advantages in machine-learning-based quantum state tomography systems and Bayesian quantum state reconstruction. Finally, we experimentally characterize the distribution of quantum states generated by both a cloud-accessed IBM quantum computer and an in-house source of polarization-entangled photons. In each case, our method can more closely match the underlying distribution than either Bures or Hilbert–Schmidt distributed states for various experimental conditions.},
doi = {10.1103/PhysRevResearch.3.043145},
journal = {Physical Review Research},
number = 4,
volume = 3,
place = {United States},
year = {Mon Nov 29 00:00:00 EST 2021},
month = {Mon Nov 29 00:00:00 EST 2021}
}
https://doi.org/10.1103/PhysRevResearch.3.043145
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