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Optics Communications

Generation of multi-photon Greenberger–Horne–Zeilinger states and cluster states through a quantum-dot spin in optical microcavity

Yang Xu, Qi Guo, Bin Si, Liu‐Yong Cheng, Hong‐Fu Wang, Shou Zhang

Published Oct 28, 2013• 7 citations
Publisher
DOI
10.1016/j.optcom.2013.09.067

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We propose a scheme for the preparation of a spin-qubit Greenberger–Horne–Zeilinger (GHZ) state and W state by using quantum dots (QDs) in double-sided optical microcavities with the help of polarized photons. The spin-selective photon reflection from the cavity provides us a perfect way to achieve the scheme by adding some simple linear optical elements and conventional photon detectors. A numerical simulation demonstrates that a perfect scheme of the GHZ state and W state generation can be achieved in one step, and high fidelities can be realized when the side leakage and cavity loss are low, which is feasible in the weak coupling regime. Therefore, our scheme might contribute to quantum communication, quantum teleportation, and some other fields in quantum information processing.
We propose a scheme for the generation of hyperentangled multiqubit cluster states and Greenberger–Horne–Zeilinger states in both polarization and spatial mode degrees of freedom using the quantum-dot cavity system. This device can be used as the complete analyzer of hyperentangled multiphoton states. This proposed hyperentanglement generation and analyzer device can serve as a crucial component of high capacity, long-distance quantum communication. Using existing experimental data, it is demonstrated that the present scheme may be feasible in strong-coupling regimes with current techniques.