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Quantum Teleportation Under Different Collective Noise Environment
摘要： We investigate that the average fidelity of the standard quantum teleportation communication protocol when the quantum channel is affected by different local collective noise environments frequently encountered in real quantum communication protocol. We show that the quantum teleportation efficiency can be enhanced when the noise is unavoidable by choose the fit Bell state as the quantum channel, especially we can get perfect quantum teleportation efficiency under the local collective Pauli σy noise environment. Our work can shed some light on the application of practical standard quantum teleportation communication protocol.
关键词： Quantum teleportation,Quantum noise environment,Quantum master equation,Average fidelity
更新于2025-09-23 15:21:01
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Detection of a mixed bipartite entangled state in arbitrary dimension via a structural physical approximation of partial transposition
摘要： It is crucial to know whether the quantum state generated in the experiment is entangled. In the literature, this topic was studied extensively and researchers proposed different approaches for the detection of a mixed bipartite entangled state in arbitrary dimension. Proceeding in this line of research, we propose three different criteria for the detection of mixed bipartite negative partial transpose (NPT) entangled state in arbitrary dimension. Our criteria are based on the method of structural physical approximation (SPA) of partial transposition (PT). We show that the proposed criteria for the detection of a NPT entangled state can be realized experimentally. Two of the proposed criteria are given in terms of the concurrence of the given state in arbitrary dimension so it is essential to ?nd out the concurrence. Thus, we provide lower and upper bounds of concurrence of the quantum state under investigation in terms of average ?delity of two quantum states, and hence these bounds can be realized experimentally. Moreover, we show how to perform a SPA map on a qutrit-qubit system and then explicitly calculate the matrix elements of the density matrix describing the SPA-PT of the qutrit-qubit system. We then illustrate our criteria for the detection of entanglement by considering a class of qubit-qubit system and a class of qutrit-qubit system.
关键词： partial transposition,concurrence,average fidelity,mixed bipartite entangled state,entanglement detection,structural physical approximation
更新于2025-09-16 10:30:52