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Remote state preparation.

C H Bennett1, D P DiVincenzo, P W Shor

  • 1IBM Research Division, Yorktown Heights, New York 10598, USA.

Physical Review Letters
|August 11, 2001
PubMed
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Remote state preparation (RSP) transmits quantum states using less classical communication than quantum teleportation. This quantum communication protocol requires only one bit per qubit, offering a more efficient method for transmitting quantum information.

Area of Science:

  • Quantum Information Science
  • Quantum Communication Protocols
  • Quantum Entanglement

Background:

  • Quantum teleportation enables transmitting unknown quantum states using entanglement and classical communication.
  • Remote State Preparation (RSP) is an alternative protocol where the sender knows the state to be transmitted.

Purpose of the Study:

  • To compare the classical communication cost of RSP with quantum teleportation.
  • To investigate the trade-off between entanglement and classical communication in RSP.
  • To analyze the RSP capacities of quantum channels.

Main Methods:

  • Theoretical analysis of quantum communication protocols.
  • Asymptotic analysis of communication cost per qubit.
  • Exploration of entanglement-resource trade-offs.

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Main Results:

  • RSP has an asymptotic classical communication cost of one bit per qubit, which is half that of quantum teleportation.
  • The communication cost is further reduced when transmitting parts of a known entangled state.
  • The study discusses the RSP capacities for various quantum channels.

Conclusions:

  • RSP offers a more communication-efficient method for transmitting known quantum states compared to teleportation.
  • Entanglement can be leveraged to further reduce the classical communication overhead in RSP.
  • Understanding RSP capacities is crucial for advancing quantum communication.