Abstract
Quantum router is an essential element in the quantum network. Here, we present a fully quantum router based on interaction free measurement and quantum dots. The signal photonic qubit can be routed to different output ports according to one control electronic qubit. Besides, our scheme is an interferometric method capable of routing single photons carrying either spin angular momentum (SAM) or orbital angular momentum (OAM), or simultaneously carrying SAM and OAM. Then we describe a cascaded multi-level quantum router to construct a one-to-many quantum router. Subsequently we analyze the success probability by using a tunable controlled phase gate. The implementation issues are also discussed to show that this scheme is feasible.
Highlights
Quantum communication allow people to transmit information quickly over long distance[1,2,3,4]
Most quantum routers are aimed at operating single photons only carrying spin angular momentum (SAM)[17,18,19,20]
Orbital angular momentum (OAM) has attracted much attention as the Hilbert space spanned by these states is in principle infinite
Summary
Quantum communication allow people to transmit information quickly over long distance[1,2,3,4]. Orbital angular momentum (OAM) has attracted much attention as the Hilbert space spanned by these states is in principle infinite. It can tremendously increase the capacity of communication system. By using interaction free measurement[25] and quantum dots[26,27], we present a fully quantum router for single photons with high efficiency. We first describe the structure of the proposed quantum router, which can route single photons according to the state of the control quantum qubit. Due to the principle of interaction free measurement, the phase difference in two superpositions would make the input signal photon pass through different output ports. We discuss the implementation issues to show that our scheme can be realized in experiment
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