# Phase-covariant cloning via adiabatic passage in fiber-nanocavity system

## TL;DR

This paper presents a scheme for long-range quantum phase-covariant cloning between two qubits in a fiber-nanocavity system using adiabatic passage, which is robust against decay and spontaneous emission.

## Contribution

It introduces a novel adiabatic passage method for quantum cloning that avoids populating cavity photons and NV center excited states, enhancing robustness.

## Key findings

- High fidelity achieved despite realistic imperfections
- No cavity or NV center excited states populated during process
- Robust against cavity decay and spontaneous emission

## Abstract

We propose an effective scheme for realizing a long-range quantum state phase-covariant cloning between two qubits in fiber-nanocavity system via an adiabatic passage. Since no cavity (fiber) photons or excited levels of the nitrogen-vacancy (NV) center are populated during the whole process, the scheme is immune to the decay of cavity (fiber) and spontaneous emission of the NV center. The strictly numerical simulation shows that the fidelity is high even in the presence of realistic imperfections.