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International Journal of Quantum Information

QDs-CAVITY APPROACH TO TELEPORTATION OF MULTIPARTITE GHZ-LIKE ENTANGLED STATE

KE-XIANG HU, Bai-Qi Jin

Published Mar 1, 2009• 1 citation
Publisher

Abstract

We study the teleportation of the entangled state in quantum dots system coupled by a single-mode cavity field. By the use of the single-photon detection, spin measurement and Faraday rotation in QDs-cavity system, we perform a teleportation of tripartite GHZ-Like state encoded in the electron spins of a three-quantum-dot system. The success probability of the scheme can reach unity if the cavities are switchable to choice the appropriate Faraday rotation angle. The scheme of the teleportation can be easily generalized to an N-quantum-dot system.

DOI
10.1142/s0219749909005237

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We study the teleportation of the entangled state in quantum dots system coupled by a single-mode cavity field. By the use of the single-photon detection, spin measurement and Faraday rotation in QDs-cavity system, we perform a teleportation of tripartite GHZ-Like state encoded in the electron spins of a three-quantum-dot system. The success probability of the scheme can reach unity if the cavities are switchable to choice the appropriate Faraday rotation angle. The scheme of the teleportation can be easily generalized to an N-quantum-dot system.
The experimental scheme for controlled quantum teleportation of tripartite GHZ-like state is presented.With the entanglement generating through the interaction between the quantum dots in microcavities and a single photon, the controlled teleportation can be realized by virtue of Faraday rotation, single photon detection and electron spin orientation measurement.The success probability of the scheme can reach 1 if the cavities are switchable to choice the appropriate Faraday rotation angle.The scheme can be easily generalized to the teleportation of multipartite GHZ-like state.
In this article, we propose an experimental scheme for implementing quantum teleportation of tripartite GHZ-Like state under the control of the controller. Due to the entanglement produced by the interaction between quantum dots embedded in microcavities and a single photon, the controlled quantum teleportation scheme of tripartite GHZ-Like state encoded in the electron spins in quantum dots can be realized in terms of theory via the conditional Faraday rotation of the polarization of single photons, single photons detection, and electron spin orientation measurement. By choosing the appropriate Faraday rotation angle for the switchable microcavities, the success probability of controlled quantum teleportation can reach 1. The similar controlled quantum teleportation procedure discussed here can be generalized to the quantum teleportation of multipartite GHZ-Like state.
We propose a teleportation scheme that relies only on single-photon measurements and Faraday rotation, for teleportation of many-qubit entangled states stored in the electron spins of a quantum dot system. The interaction between a photon and the two electron spins, via Faraday rotation in microcavities, establishes Greenberger-Horne-Zeilinger entanglement in the spin-photon-spin system. The appropriate single-qubit measurements, and the communication of two classical bits, produce teleportation. This scheme provides the essential link between spintronic and photonic quantum information devices by permitting quantum information to be exchanged between them.
We propose a teleportation scheme that relies only on single-photon measurements and Faraday rotation, for teleportation of many-qubit entangled states stored in the electron spins of a quantum dot system. The interaction between a photon and the two electron spins, via Faraday rotation in microcavities, establishes Greenberger-Horne-Zeilinger entanglement in the spin-photon-spin system. The appropriate single-qubit measurements, and the communication of two classical bits, produce teleportation. This scheme provides the essential link between spintronic and photonic quantum information devices by permitting quantum information to be exchanged between them.
We propose a scheme for deterministically teleporting a pure quantum state, making use of the Faraday rotation of photonic polarization in cavity QED system. Based on the single-photon input-output process regarding cavities, the scheme works well even in low-Q cavities. Since only virtual excitation of the atoms is involved, it is also insensitive to atomic spontaneous emission. Besides, the CNOT operation replaced by the Faraday rotation is not needed in the scheme, which could greatly relax the experimental difficulty.