Quantum superpositions and entanglement of thermal states at high temperatures and their applications to quantum information processing

Details Quantum superpositions and entanglement of thermal states at high temperatures and their applications to quantum information processing Quantum superpositions and entanglement of thermal states at high temperatures and their applications to quantum information processing

2007-04-04

arxiv.org/abs/0704.0523v2

Phys. Rev. A 76, 042103 (2007)

Physics

Quantum Physics

12 pages, 11 figures, minor corrections, to be published in Phys. Rev. A

Scientific paper

10.1103/PhysRevA.76.042103

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.

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