Laser Physics

Improving the fidelity of teleportation through noisy channels using parity-time symmetric operation

Yang Leng, Fei Chen

Published Jul 28, 2025• 2 citations

Abstract

Abstract Quantum teleportation, a cornerstone of quantum information processing, faces critical challenges from environmental noise such as amplitude damping (AD), which degrades entanglement and reduces teleportation fidelity below the classical limit of 2/3. This study investigates the role of parity-time ( PT ) symmetric operations, a type of non-Hermitian operation, in enhancing teleportation fidelity under AD noise. We first derive the explicit dynamics of entangled states subjected to AD noise using Kraus operators, showing that the average fidelity decays monotonically with increasing decoherence strength. By introducing local PT symmetric operations, we show the average fidelity exhibits periodic linear oscillations, with minimum values increasing with non-Hermiticity and remaining above 2/3, while maximum fidelity consistently reaches the optimal value of 1. These results confirm that non-Hermitian operations effectively protect quantum teleportation fidelity, maintaining stability and optimal performance despite parameter variations. Experimental feasibility is discussed using nuclear magnetic resonance systems with duality quantum computing techniques.

DOI: 10.1088/1555-6611/adf0f3

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