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Journal of Physics B Atomic Molecular and Optical Physics

Quantum telecloning of an optical coherent state to atomic ensembles

Mingfeng Wang, Yanwei Wang, Mang-Mang Ni, Yi-Zhuang Zheng

Published Nov 10, 2008• 0 citations
Publisher

Abstract

A scheme for symmetrically telecloning a coherent light state onto two atomic ensembles is proposed. Using the generated multipartite entanglement as the quantum channel, we achieve a fidelity for each clone of F = 0.58 in the case of single feedback, while it is 0.63 for the double feedback case. Furthermore, we also explored the implementation of our scheme with a different quantum channel and find that the optimal fidelity 2/3 can be reached. Atom–atom quantum telecloning is finally studied, showing that only small coupling constants are required for the achievement of high fidelities.

DOI
10.1088/0953-4075/41/22/225504

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A scheme for symmetrically telecloning a coherent light state onto two atomic ensembles is proposed. Using the generated multipartite entanglement as the quantum channel, we achieve a fidelity for each clone of F = 0.58 in the case of single feedback, while it is 0.63 for the double feedback case. Furthermore, we also explored the implementation of our scheme with a different quantum channel and find that the optimal fidelity 2/3 can be reached. Atom–atom quantum telecloning is finally studied, showing that only small coupling constants are required for the achievement of high fidelities.
We introduce and describe in detail a different quantum-information protocol: quantum telecloning of optical images or spatially multimode states of light. This protocol is a natural generalization of a continuous-variable quantum telecloning of single-mode states, investigated earlier theoretically and recently realized experimentally. Our protocol is an example of a multiuser parallel quantum channel. In order to realize this scheme one needs a multimode multipartite entanglement between the original and the target systems. We calculate the fidelity of quantum parallel telecloning in dependence on the spatiotemporal scales of our scheme and on the number of pixels. The fidelity is superior to the best classical fidelity that can be achieved without this kind of entanglement.
We propose a scheme of 1$\to2optimaluniversalasymmetricquantumtelecloningofpuremultiqubitstates.Inparticular,wefirstinvestigatetheasymmetrictelecloningofarbitrary2−qubitstatesandthenextendittothecaseofmultiqubitsystem.Manyfiguresofmeritforthetelecloningprocessarechecked,includingtheentanglementofthequantumchannelandfidelitiesoftheclones.Ourschemecanbeusedforthe12 optimal universal asymmetric quantum telecloning of pure multiqubit states. In particular, we first investigate the asymmetric telecloning of arbitrary 2-qubit states and then extend it to the case of multiqubit system. Many figures of merit for the telecloning process are checked, including the entanglement of the quantum channel and fidelities of the clones. Our scheme can be used for the 12optimaluniversalasymmetricquantumtelecloningofpuremultiqubitstates.Inparticular,wefirstinvestigatetheasymmetrictelecloningofarbitrary2−qubitstatesandthenextendittothecaseofmultiqubitsystem.Manyfiguresofmeritforthetelecloningprocessarechecked,includingtheentanglementofthequantumchannelandfidelitiesoftheclones.Ourschemecanbeusedforthe1\to$4 universal telecloning of mixed multiqubit states.
We propose a scheme to implement the optimal symmetric 1 → 2 universal quantum telecloning through cavity-assisted interaction. In our scheme, an arbitrary single atomic state can be telecloned to two single atomic states. And three atoms are trapped in three spatially separated cavities respectively. With a particular multiparticle entangled state acting as a quantum information channel and the trapped single atom acting as a quantum network node for its long-lived internal state, quantum information can be telecloned among nodes and can stored in the nodes.
We propose entangled (M+1)-mode quantum states as a multiuser quantum channel for continuous-variable communication. Arbitrary quantum states can be sent via this channel simultaneously to M remote and separated locations with equal minimum excess noise in each output mode. For a set of coherent-state inputs, the channel realizes optimal symmetric 1-->M cloning at a distance ("telecloning"). It also provides the optimal cloning of coherent states without the need of amplifying the state of interest. The generation of the multiuser quantum channel requires no more than two 10log10[(root square[M]-1)/(root square[M]+1)] dB squeezed states and M beam splitters.