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Hierarchical controlled quantum teleportation
摘要： This paper describes a hierarchical controlled quantum teleportation scheme of arbitrary two-qubit based on an eight-particle maximum entanglement state among four parties, one sender and three receivers. In order to prevent the infidelity of the receivers, secret state will be purposefully split and sent to the three receivers. According to the non-cloning theorem, only one of the three receivers can recover secret state and the high authorized receiver that recovers the information only requires the cooperation of one of the remaining two receivers. On the contrary, the low authorized party that recovers the secret state requires the cooperation of all remaining receivers.
关键词： maximally entangled eight-qubit state,Hierarchical,controlled quantum teleportation
更新于2025-09-12 10:27:22
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Controlled Asymmetric Bidirectional Hybrid of Remote State Preparation and Quantum Teleportation
摘要： We propose a protocol of Asymmetric implementing controlled joint remote state preparation and meanwhile realizing controlled quantum teleportation. That is to say, Alice wants to teleport an arbitrary two-qubit state to Bob, and Bob wants to remotely prepare a known state for Alice via the control of supervisors Charlie. Compared with previous studies for the schemes of solely bidirectional quantum teleportation, the new protocol is a kind of hybrid approach of information communication which makes the quantum channel multipurpose.
关键词： Two-qubit state,Asymmetric bidirectional information communication,Hybrid of remote state preparation and quantum teleportation
更新于2025-09-11 14:15:04
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Enhance quantum teleportation under correlated amplitude damping decoherence by weak measurement and quantum measurement reversal
摘要： A scheme which aims to protect the quantum teleportation from correlated amplitude damping decoherence is proposed. Comparing with the results of uncorrelated amplitude damping noise, we ?nd that the correlated effects enable to improve the ?delity with the given decoherence parameter. Moreover, we show that the combination of weak measurement and quantum measurement reversal could drastically enhance the ?delity in both uncorrelated and correlated amplitude damping noise. Our results extend the ability of weak measurement as a technique in various quantum information processes which are affected by correlated noise.
关键词： Weak measurement,Correlated amplitude damping channel,Quantum teleportation
更新于2025-09-10 09:29:36
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Simulation of Gaussian channels via teleportation and error correction of Gaussian states
摘要： Gaussian channels are the typical way to model the decoherence introduced by the environment in continuous-variable quantum states. It is known that those channels can be simulated by a teleportation protocol using as a resource state either a maximally entangled state passing through the same channel, i.e., the Choi state, or a state that is entangled at least as much as the Choi state. Since the construction of the Choi state requires infinite mean energy and entanglement, i.e., it is unphysical, we derive instead every physical state able to simulate a given channel through teleportation with finite resources and we further find the optimal ones, i.e., the resource states that require the minimum energy and entanglement. We show that the optimal resource states are pure and equally entangled to the Choi state as measured by the entanglement of formation. We also show that the same amount of entanglement is enough to simulate an equally decohering channel, while even more entanglement can simulate less decohering channels. We finally use that fact to generalize a previously known error-correction protocol by making it able to correct noise coming not only from pure loss but from thermal loss channels as well.
关键词： Gaussian states,quantum teleportation,error correction,Gaussian channels,entanglement of formation
更新于2025-09-09 09:28:46