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Area of Science:

  • Quantum Information Science
  • Quantum Communication
  • Quantum Computing

Background:

  • Quantum capacity is vital for quantum memories and communication.
  • Correlated errors pose a significant challenge in estimating quantum capacity.
  • Quantum repeaters require reliable methods to assess information transmission capabilities.

Purpose of the Study:

  • To present a protocol for estimating a lower bound on quantum capacity.
  • To address challenges posed by arbitrarily correlated errors.
  • To provide a tool for testing quantum repeater performance and verifying channel performance.

Main Methods:

  • The protocol estimates the one-shot quantum capacity using two measurement bases.
  • A second version verifies the quantum capacity in real-time during data transmission or storage.
  • The method utilizes all involved qubits as test qubits.

Main Results:

  • The protocol provides a lower bound on quantum capacity, robust against correlated errors.
  • Demonstrated applicability to quantum repeaters and channel performance verification.
  • The method is asymptotically optimal for channels like the dephasing channel.

Conclusions:

  • The presented protocol offers a practical and implementable approach to assess quantum channel performance.
  • The method was successfully applied to a superconducting qubit experiment.
  • This work contributes to advancing reliable quantum communication and memory technologies.