Quantum superpositions and entanglement of thermal states at high temperatures and their applications to quantum information processing
arXiv:0704.0523 · doi:10.1103/PhysRevA.76.042103
Abstract
We study characteristics of superpositions and entanglement of thermal states at high temperatures and discuss their applications to quantum information processing. We introduce thermal-state qubits and thermal-Bell states, which are a generalization of pure-state qubits and Bell states to thermal mixtures. A scheme is then presented to discriminate between the four thermal-Bell states without photon number resolving detection but with Kerr nonlinear interactions and two single-photon detectors. This enables one to perform quantum teleportation and gate operations for quantum computation with thermal-state qubits.
arXiv comment12 pages, 11 figures, minor corrections, to be published in Phys. Rev. A
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