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Laser Technology

Quantum teleportation of atomic state in decoherent-free subspace

Cong Li

Published Jan 1, 2013• 0 citations
OpenAlex

Abstract

In order to suppress the influence of the environment on quantum teleportation,a scheme of quantum teleportation was presented based on decoherent-free subspace.In this scheme,a kind of disentanglement-free atomic sixbit state is taken as quantum entanglement channel,and the teleportated one logical qubit quantum information is encoded into three-bit atomic state which can avoid against influence of the environment.The properties of the quantum teleportation scheme and its experimental realization were analyzed.The result shows that the whole teleportation process is immune to amplitude-flip and phase-flip noises induced by the environment and the success probability for this scheme is 44%.

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In order to suppress the influence of the environment on quantum teleportation,a scheme of quantum teleportation was presented based on decoherent-free subspace.In this scheme,a kind of disentanglement-free atomic sixbit state is taken as quantum entanglement channel,and the teleportated one logical qubit quantum information is encoded into three-bit atomic state which can avoid against influence of the environment.The properties of the quantum teleportation scheme and its experimental realization were analyzed.The result shows that the whole teleportation process is immune to amplitude-flip and phase-flip noises induced by the environment and the success probability for this scheme is 44%.
In order to improve the anti-noise performance of quantum teleportation, this paper proposes a novel dynamic quantum anti-noise scheme based on the quantum teleportation which transmits single qubit state using Bell state. Considering that quantum noise only acts on the transmitted qubit, i.e., the entangled state that Alice and Bob share in advance is affected by the noise, thus affecting the final transmission result. In this paper, a method for dynamically adjusting the shared entangled state according to the noise environment is proposed. By calculating the maximum fidelity of the output state to determine the shared entangled state, which makes the quantum teleportation be affected by the noise as little as possible. This paper calculates the fidelity of teleportation under four kinds of channel noise (amplitude damping, phase damping, bit flip and depolarizing noise). The results show that the scheme has a suppression effect on phase damping, bit flip and depolarizing noise under certain conditions. When the noise intensity is larger, the optimized efficiency is better.
Quantum teleportation of two qubits based on One-to-Many without the Bell-state measurement is proposed.In the scheme of teleportation,(2n+2)-particle entanglement is required as the quantum channel.The teleportation can be realized by sending atoms into a single-mode cavity which is driven by a strong classical field at the same time.During the interaction of the atoms with the cavity,the states of these atoms evolve.The scheme immunes the effects of thermal field and cavity decay.The success probability is 1.0.
A scheme for teleportation of weak entangled coherent state is proposed by using the cavity quantum electrodynamics(QED).We prepare an cavity entangled with an atom as the quantum channel.In this letter decoherent phenomena can be avoided in very degree,we also realize the probability of successful teleportation via no-Bell Measurement detection.It found that the non-orthogonal properties of the entangled coherent states is reflected,and analyzes the success of teleportation affected by the mean photons in this letter.
The quantum teleportation is an emerging communication technology based on the principles of quantum mechanics. It utilizes the properties of quantum entanglement and quantum superposition to achieve secure transmission of information. Most of the current quantum teleportation protocols are analyzed under ideal environment, and merely realized the transmission of either single or two particle unknown quantum states between two participants. In this paper, by using eleven entangled quantum states as a quantum channel, we propose a cyclic and asymmetric novel protocol for four participants. The communication task is achieved by employing GHZ state measurement (GHZ), single-qubit measurement (SM), and unitary operations (UO) as the foundation of this protocol. Analysis demonstrates that the success probability of the proposed protocol can reach 100%. Furthermore, considering that in actual production environments, it is difficult to avoid the occurrence of noise in quantum channels, this paper also analyzes the changes in fidelity in two types of noisy scenarios: bit-flip noise, phase-flip noise. Showing that communication quality only depends on the amplitude parameters of the initial state and decoherence rate. Finally, we give a comparison with previous similar schemes in terms of achieved method and intrinsic efficiency, which illustrates the superiority of our protocol.