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Consider a linear AC Thevenin equivalent circuit connected to a load impedance.
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Updated: May 22, 2025

Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Communication Power of a Noisy Qubit.

Giulio Chiribella1,2,3, Saptarshi Roy1, Tamal Guha1

  • 1The University of Hong Kong, QICI Quantum Information and Computation Initiative, Department of Computer Science, Pokfulam Road, Hong Kong.

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Quantum communication channels, even noisy ones, offer advantages over classical bit channels. Entanglement-breaking quantum channels enable guaranteed success in a game, unlike classical methods.

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Area of Science:

  • Quantum Information Science
  • Quantum Communication
  • Classical Information Theory

Background:

  • A fundamental limit in quantum communication is that a single qubit transmits at most one bit of classical information.
  • This limitation persists in entanglement-breaking channels, even with shared entanglement.
  • The question arises whether noisy entanglement-breaking qubit channels are equivalent to noisy bit channels for classical communication.

Purpose of the Study:

  • To investigate if noisy entanglement-breaking qubit channels can be replaced by noisy bit channels for classical communication.
  • To introduce and analyze a game demonstrating the distinct capabilities of quantum versus classical communication channels.
  • To determine if classical strategies can simulate quantum communication in entanglement-breaking scenarios.

Main Methods:

  • Introduction of a novel game analogous to the Monty Hall problem, involving a sender and receiver.
  • Analysis of classical strategies using noisy bit channels with shared randomness.
  • Analysis of quantum strategies using noisy entanglement-breaking qubit channels (quantum not channels) with shared entanglement.

Main Results:

  • No classical strategy using a noisy bit channel can guarantee avoiding a "bomb" in the game, even with shared randomness.
  • Quantum communication via noisy entanglement-breaking channels (quantum not channels) allows deterministic avoidance of the bomb and a guaranteed probability of finding the "prize".
  • Classical communication assisted by classical correlations cannot generally simulate quantum communication through noisy entanglement-breaking qubit channels assisted by quantum entanglement.

Conclusions:

  • Noisy entanglement-breaking qubit channels offer superior capabilities for certain classical communication tasks compared to classical bit channels.
  • Quantum entanglement provides a resource that enables advantages in communication tasks that cannot be replicated by classical correlations.
  • The study highlights fundamental differences between quantum and classical communication, particularly in the context of noisy channels and entanglement.