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We present a simple measurement technique to find lower bounds for quantum capacities in noisy quantum communication channels. This method is easy to implement and requires no prior channel information, proving effective for various single-qubit and generalized Pauli channels.

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Area of Science:

  • Quantum Information Science
  • Quantum Communication
  • Channel Characterization

Background:

  • Noisy quantum channels limit the reliable transmission of quantum information.
  • Quantifying the capacity of quantum channels is crucial for quantum communication.
  • Characterizing unknown quantum channels is a significant challenge.

Purpose of the Study:

  • To develop a practical method for detecting lower bounds of quantum capacities for noisy quantum communication channels.
  • To establish a technique that is independent of prior knowledge of the channel.
  • To assess the efficiency of the proposed method on standard quantum channels.

Main Methods:

  • Proposing a measurement-based approach to estimate lower bounds on quantum capacities.
  • Implementing the method without requiring any prior information about the quantum channel's characteristics.
  • Testing the method's performance on well-established single-qubit noisy channels and generalized Pauli channels in arbitrary dimensions.

Main Results:

  • The proposed method successfully detects lower bounds for quantum capacities.
  • The technique is shown to be easily implementable and robust.
  • The method's efficiency is validated across various single-qubit noisy channels and generalized Pauli channels.

Conclusions:

  • A practical and knowledge-independent method for bounding quantum channel capacities has been developed.
  • The technique offers a valuable tool for characterizing noisy quantum communication channels.
  • The findings contribute to the advancement of reliable quantum communication protocols.