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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Investigating Imperfect Cloning for Extending Quantum Communication Capabilities.

Masab Iqbal1, Luis Velasco1, Nelson Costa2

  • 1Advanced Broadband Communications Center (CCABA), Universitat Politècnica de Catalunya (UPC), 08034 Barcelona, Spain.

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|September 28, 2023
PubMed
Summary
This summary is machine-generated.

Imperfect quantum copies can enable reliable qubit retransmission and point-to-multipoint quantum communication. The proposed Quantum Automatic Repeat Request (QARQ) protocol shows improved qubit recovery, outperforming direct transmission and teleportation.

Keywords:
Quantum Automatic Repeat Requestimperfect cloningpoint-to-multipoint quantum communication

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Area of Science:

  • Quantum Information Science
  • Quantum Communication Protocols
  • Quantum Computing Applications

Background:

  • The no-cloning theorem limits certain quantum communication paradigms like qubit retransmission and point-to-multipoint quantum communication (QP2MP).
  • Universal Quantum Copying Machines (UQCMs) generate imperfect qubit copies, potentially overcoming these limitations.

Purpose of the Study:

  • Investigate the utility of UQCMs for enabling qubit retransmission and QP2MP.
  • Propose and analyze the Quantum Automatic Repeat Request (QARQ) protocol for reliable quantum communication.
  • Evaluate protocol performance under realistic noise conditions using different quantum technologies.

Main Methods:

  • Proposed the Quantum Automatic Repeat Request (QARQ) protocol, adapting its classical counterpart.
  • Investigated QP2MP communication using imperfect quantum clones.
  • Simulated protocols using Nitrogen-Vacancy (NV) centers under various noise sources.
  • Compared Direct Transmission (DT), Teleportation (TP), and Telecloning (TC) quantum technologies.

Main Results:

  • Telecloning (TC) demonstrated superior fidelity in both QARQ and QP2MP compared to TP and DT.
  • The QARQ protocol significantly enhances qubit recovery.
  • Increased cloning does not consistently improve qubit recovery in the QARQ protocol.
  • TC exhibits higher quantum cost despite its performance advantages.

Conclusions:

  • UQCMs and the QARQ protocol can facilitate previously impossible quantum communication paradigms.
  • The choice of quantum technology (DT, TP, TC) impacts protocol fidelity and complexity.
  • Further development of these protocols could advance distributed quantum computing applications.