Quantum computation with coupled-quantum-dots embedded in optical microcavities

Details Quantum computation with coupled-quantum-dots embedded in optical microcavities Quantum computation with coupled-quantum-dots embedded in optical microcavities

2002-03-29

arxiv.org/abs/quant-ph/0203145v1

Phys. Rev. B 65, 205301 (2002)

Physics

Quantum Physics

to appear in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.65.205301

Based on an idea that spatial separation of charge states can enhance quantum coherence, we propose a scheme for quantum computation with quantum bit (qubit) constructed from two coupled quantum dots. Quantum information is stored in electron-hole pair state with the electron and hole locating in different dots, which enables the qubit state being very long-lived. Universal quantum gates involving any pair of qubits are realized by coupling the quantum dots through cavity photon which is a hopeful candidate to transfer long-range information. Operation analysis is carried out by estimating the gate time versus the decoherence time.

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