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Related Experiment Video

Updated: May 11, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Classical command of quantum systems.

Ben W Reichardt1, Falk Unger, Umesh Vazirani

  • 1Electrical Engineering Department, University of Southern California, Los Angeles, California 90089, USA. ben.reichardt@usc.edu

Nature
|April 27, 2013
PubMed
Summary
This summary is machine-generated.

This study extends the Clauser-Horne-Shimony-Holt test to characterize large quantum systems. The new method verifies quantum device behavior, crucial for quantum computation and cryptography security.

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Last Updated: May 11, 2026

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Published on: May 30, 2014

Area of Science:

  • Quantum Information Science
  • Quantum Physics
  • Cryptography

Background:

  • Interactions with untrusted systems are common in quantum computation and cryptography.
  • Existing tests, like the Clauser-Horne-Shimony-Holt (CHSH) inequality, distinguish quantum from classical systems.
  • Characterizing large, potentially untrusted quantum systems is essential for reliable applications.

Purpose of the Study:

  • To extend the CHSH test for characterizing large quantum systems.
  • To develop a scheme for verifying the behavior of quantum devices without assumptions about their internal workings.
  • To enable the testing of quantum computers and advance secure quantum cryptography.

Main Methods:

  • Developed a scheme to test bipartite quantum systems treated as black boxes.
  • The scheme determines the initial state and commands system evolution.
  • It verifies quantum behavior even if the system is designed to deceive.

Main Results:

  • Successfully extended the CHSH test for large quantum system characterization.
  • The proposed scheme can detect misbehavior in quantum systems.
  • Demonstrated the ability to verify if a quantum computer is genuinely quantum.

Conclusions:

  • The developed scheme provides a robust method for verifying quantum system behavior.
  • This advancement is critical for the security and reliability of quantum computation and cryptography.
  • Enables the use of untrusted quantum devices for secure key distribution.