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Journal of Modern Optics

Optical protocol for quantum state sharing of superposed coherent state

Yan Xia, Jie Song, He‐Shan Song

Published Jul 18, 2008• 0 citations
Publisher

Abstract

We propose an optical protocol for quantum state sharing of superposed coherent state in terms optical elements. Our protocol can realize a near-complete quantum state sharing of a superposed coherent state with arbitrary coeficients. The realization of this protocol is appealing due to the fact that the quantum state of light is robust against the decoherence and photons are ideal carriers for transmitting quantum information over long distances. This protocol can also be generalized to the multiparty system.

DOI
10.1080/09500340801950623

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We propose an optical protocol for quantum state sharing of superposed coherent state in terms optical elements. Our protocol can realize a near-complete quantum state sharing of a superposed coherent state with arbitrary coeficients. The realization of this protocol is appealing due to the fact that the quantum state of light is robust against the decoherence and photons are ideal carriers for transmitting quantum information over long distances. This protocol can also be generalized to the multiparty system.
We propose a new linear optical protocol for remote state preparation (RSP) between two parties under control of a number of controllers in terms of optical elements. The proposed setup involves simple linear optical elements, a N-photon polarization entangled state, and photon de tectors, witch have been widely used in experiment. The realization of this protocol is appealing due to the fact that quantum state of light is robust against the decoherence and photons are ideal carriers for transmitting quantum information over long distances.
We propose protocols for quantum teleportation of superposed coherent states of atomic Bose—Einstein condensates. We use the photon entanglement states as the quantum channel, which makes it possible to realize the distant teleportation of atomic states. Two robust protocols are introduced: one is a single-photon scheme in which an entangled single-photon state serves as the quantum channel, and the other is a multi-photon scheme where an entangled coherent state of the probe lasers is used as the quantum channel.
The four Bell-type entangled coherent states, $\ensuremath{\mid}\ensuremath{\alpha}⟩\ensuremath{\mid}\ensuremath{-}\ensuremath{\alpha}⟩\ifmmode\pm\else\textpm\fi{}\ensuremath{\mid}\ensuremath{-}\ensuremath{\alpha}⟩\ensuremath{\mid}\ensuremath{\alpha}⟩$ and $\ensuremath{\mid}\ensuremath{\alpha}⟩\ensuremath{\mid}\ensuremath{\alpha}⟩\ifmmode\pm\else\textpm\fi{}\ensuremath{\mid}\ensuremath{-}\ensuremath{\alpha}⟩\ensuremath{\mid}\ensuremath{-}\ensuremath{\alpha}⟩$, can be discriminated with a high probability using only linear optical means, as long as $\ensuremath{\mid}\ensuremath{\alpha}\ensuremath{\mid}$ is not too small. Based on this observation, we propose a simple scheme to almost completely teleport a superposed coherent state. The nonunitary transformation that is required to complete the teleportation can be achieved by embedding the receiver's field state in a larger Hilbert space consisting of the field and a single atom and performing a unitary transformation on this Hilbert space.
Optical photons are powerful carriers of quantum information, which can be delivered in free space by satellites or in fibers on the ground over long distances. Entanglement of quantum states over long distances can empower quantum computing, quantum communications, and quantum sensing. Quantum optical memories are devices designed to store quantum information in the form of stationary excitations, such as atomic coherence, and are capable of coherently mapping these excitations to flying qubits. Quantum memories can effectively store and manipulate quantum states, making them indispensable elements in future long-distance quantum networks. Over the past two decades, quantum optical memories with high fidelities, high efficiencies, long storage times, and promising multiplexing capabilities have been developed, especially at the single-photon level. In this review, we introduce the working principles of commonly used quantum memory protocols and summarize the recent advances in quantum memory demonstrations. We also offer a vision for future quantum optical memory devices that may enable entanglement distribution over long distances.