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理论物理通讯：英文版

Controlled Quantum Teleportation Through Noisy GHZ Channel

Cao Zhuo

Published Jan 1, 2010• 0 citations
OpenAlex

Abstract

In this paper, we propose two physical schemes for teleporting an unknown atomic state through noisy channel in cavity QED. The quantum channel is a noisy one—a mixed GHZ state, which is more realistic in quantum information processing. We solve analytically a master equation in the Lindblad form with (L_(2,z), L_(3,z), L_(4,z))-type of noise in cavity QED. A comparison between the two protocols are discussed.

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In this paper, we propose two physical schemes for teleporting an unknown atomic state through noisy channel in cavity QED. The quantum channel is a noisy one—a mixed GHZ state, which is more realistic in quantum information processing. We solve analytically a master equation in the Lindblad form with (L_(2,z), L_(3,z), L_(4,z))-type of noise in cavity QED. A comparison between the two protocols are discussed.
We propose a scheme for controlled teleportion of an arbitrary two-atom state in cavity QED. In the scheme a GHZ state and an EPR pair are chosen as quantum channels. The sender can teleport quantum information to the receiver with the help of the controller. In the teleportation process two pairs of atoms interact respectively with two identical single-mode cavities; meanwhile, the two pairs of atoms are respectively driven by two identical classical fields. The scheme is insensitive to the cavity decay and thermal field and the success probability is 1.0.
Quantum teleportation plays a significant role in the field of quantum communication. This paper investigates quantum teleportation through a noisy environment by using GHZ state and non-standard W state as quantum channels. We analyze the efficiency of quantum teleportation by solving analytically a master equation in Lindblad form. Following the quantum teleportation protocol, we obtain the fidelity of quantum teleportation as a function of evolution time. The calculation results show that the teleportation fidelity using non-standard W is higher in comparison to GHZ state at the same evolution time. Moreover, we consider the efficiency of teleportation with weak measurements and reverse quantum measurement under amplitude damping noise. Our analysis suggests that the teleportation fidelity using non-standard W is also more robust to noise than GHZ state in the same conditions. Interestingly, we found that weak measurement and its reverse operation have no positive effect on the efficiency of quantum teleportation by using GHZ and non-standard W state in the amplitude damping noise environment. In addition, we also demonstrate the efficiency of quantum teleportation can be improved by making minor modifications to the protocol.
We present a physical scheme to teleport an unknown atomic entangled state via cavity decay. In the teleportation process, four-particle Greenberger–Horne–Zeilinger (GHZ) state is used as quantum channel, and two unknown entangled atoms and two of four atoms in the four-particle GHZ state are trapped in four leaky cavities, respectively. Based on the joint detection of the photons leak out from the four cavities, we can teleport an unknown entangled state to two other remote atoms with certain probability and high fidelity.