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Protected State Transfer via an Approximate Quantum Adder.

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  • 1Departamento de Ciencias, Sección Física, Pontificia Universidad Católica del Perú, Apartado, 1761, Lima, Peru.

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We developed a new quantum communication protocol to send single photon states through noisy channels. This method offers a higher success rate than existing quantum teleportation techniques for shorter distances.

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Area of Science:

  • Quantum Information Science
  • Quantum Communication
  • Quantum Optics

Background:

  • Quantum states are fragile and susceptible to decoherence when transmitted through noisy channels.
  • Existing quantum communication protocols often struggle with fidelity and success rates in the presence of channel noise.
  • Depolarizing channels represent a common and challenging type of noise in quantum systems.

Purpose of the Study:

  • To propose a novel decoherence-protected protocol for transmitting single photon quantum states.
  • To enhance the success probability of sending quantum information through depolarizing channels.
  • To compare the proposed protocol's performance against established quantum teleportation methods.

Main Methods:

  • Implementation of an approximate quantum adder using spontaneous parametric down-conversion (SPDC).
  • Engineering of the quantum adder to protect single photon states from decoherence.
  • Theoretical analysis and comparison with distilled quantum teleportation protocols.

Main Results:

  • The proposed protocol demonstrates a higher success probability compared to distilled quantum teleportation.
  • The advantage in success probability is observed for transmission distances below a specific threshold.
  • The threshold distance is dependent on the characteristics of the depolarizing channel.

Conclusions:

  • The developed protocol offers a robust method for quantum state transmission in noisy environments.
  • This approach provides a practical improvement for quantum communication over limited distances.
  • The findings suggest potential for more reliable quantum networks utilizing this protocol.