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理论物理通讯：英文版

Transferring and Bounding Single Photon in Waveguide Controlled by Quantum Node Based on Atomic Ensemble

Lü, Jing, Dong, Hui Hui, Kuang Kuang, Le-Man

Published Jan 1, 2009• 0 citations
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Transferring and bounding single photon in waveguide controlled by quantum node based on atomic ensemble

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We study the scattering process of photons confined in a one dimensional optical waveguide by a laser controlled atomic ensemble. The investigation leads to an alternative setup of quantum node controlling the coherent transfer of single photon in such one dimensional continuum. To exactly solve the effective scattering equations by using the discrete coordinate approach, we simulate the linear waveguide as a coupled resonator array at the high energy limit. We generally calculate the transmission coefficients and its vanishing at resonace reflects the good controllability of our scheme. We also show that there exist two bound states to describe the localize photons around the cavity.
We study the scattering process of photons confined in a one-dimensional optical waveguide by a laser controlled atomic ensemble. The investigation leads to an alternative setup of quantum node controlling the coherent transfer of single photon in such one dimensional continuum. To exactly solve the effective scattering equations by using the discrete coordinate approach, we simulate the linear waveguide as a coupled resonator array at the high energy limit. We generally calculate the transmission coefficients and its vanishing at resonance reflects the good controllability of our scheme. We also show that there exist two bound states to describe the localize photons around the cavity.
We propose a scheme to perform quantum information transfer based on hybrid spin-photon qubit encoding in superconducting quantum circuits. The hybrid qubit consists of a nitrogen-vacancy center spin ensemble coherently coupled to a microwave photon confined in a frequency tunable superconducting co-planar waveguide cavity. The spin ensemble-cavity hybrid system forms quantum nodes capable of sending, receiving, storing, and releasing photonic quantum information by the hybrid encoding. Quantum information transfer between distinct nodes is achieved by the coherent exchange of a single photon. We show the faithful transfer of an arbitrary superposition hybrid quantum state between two separate identical nodes via coherent control on the system’s dynamics. The protocol may have interesting applications in quantum networking with this hybrid spin-photon structure.