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Distributed quantum dense coding.

D Bruss1, G M D'Ariano, M Lewenstein

  • 1Institut für Theoretische Physik, Universität Hannover, D-30167 Hannover, Germany.

Physical Review Letters
|December 18, 2004
PubMed
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We introduce distributed quantum dense coding, a multi-sender, multi-receiver generalization. Global sender operations do not boost capacity with one receiver, but a bound is derived for two receivers.

Area of Science:

  • Quantum Information Science
  • Quantum Communication Protocols

Background:

  • Quantum dense coding enables sending two classical bits using one quantum bit.
  • Generalizing dense coding to multiple senders and receivers is an open challenge.

Purpose of the Study:

  • To introduce and analyze distributed quantum dense coding.
  • To determine the impact of sender operations on information capacity.
  • To classify quantum states based on their dense coding utility.

Main Methods:

  • Theoretical analysis of quantum information transfer.
  • Derivation of capacity bounds for multi-receiver scenarios.
  • Investigation of entanglement properties for dense coding.

Main Results:

Related Experiment Videos

  • Global sender operations do not enhance capacity for a single receiver.
  • A nontrivial upper bound on capacity is established for two receivers using local operations and classical communication.
  • Bound entanglement is shown to be ineffective for dense coding in the bipartite case.

Conclusions:

  • Distributed quantum dense coding extends the capabilities of quantum communication.
  • The capacity is constrained by the nature of sender operations and receiver configurations.
  • A framework for evaluating quantum states for dense coding is proposed.