Abstract
We propose a scheme to realize heralded quantum entanglement between two distant matter qubits using two Λ atom systems. Our proposal does not need any photon interference. We also present a general theory of outcome state of non-monochromatic incident light and finite interaction time.
Highlights
We propose a scheme to realize heralded quantum entanglement between two distant matter qubits using two Λ atom systems
Effectively generating heralded entangled state on matter qubits is the central issue in the study of fundamental quantum mechanics and long distance quantum communication
Distant heralded quantum entanglement has never been realized because all the existing schemes and experiments encounter the technical challenging of distant photon interferences
Summary
We propose a scheme to realize heralded quantum entanglement between two distant matter qubits using two Λ atom systems. Effectively generating heralded entangled state on matter qubits is the central issue in the study of fundamental quantum mechanics and long distance quantum communication. Note that here we consider the issue of the wave-fronts, a long coherent length of the wave trains does not help Due to these highly technical challenging, so far the realized distance for two-photon interference in free space is rather limited. The highest record of the distance of two-photon interference in free space is 220m with one side free space and the other side optical fiber, which was done by Yong et al.[29] by using highly sophisticated technologies of APT (acquiring, pointing and tracking) and SMF (single mode fiber) It will be even more challenging if one tries to improve the experiment with both sides being free space. We shall first show our scheme in generating distant-matter-qubit quantum entanglement and we make a detailed study for our outcome quantum entanglement state both analytically and numerically
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