Quantum computation by optically coupled steady atoms/quantum-dots inside a quantum electro-dynamic cavity

Details Quantum computation by optically coupled steady atoms/quantum-dots inside a quantum electro-dynamic cavity Quantum computation by optically coupled steady atoms/quantum-dots inside a quantum electro-dynamic cavity

2000-02-02

arxiv.org/abs/quant-ph/0002006v1

Physics

Quantum Physics

4 pages, 1 figure

Scientific paper

We present a model for quantum computation using n steady 3-level atoms or 3-level quantum dots, kept inside a quantum electro-dynamics (QED) cavity. Our model allows one-qubit operations and the two-qubit controlled-NOT gate as required for universal quantum computation. The n quantum bits are described by two energy levels of each atom/dot. An external laser and n separate pairs of electrodes are used to address a single atom/dot independent of the others, via Stark effect. The third level of each system and an additional common-mode qubit (a cavity photon) are used for realizing the controlled-NOT operation between any pair of qubits. Laser frequency, cavity frequency, and energy levels are far off-resonance, and they are brought to resonance by modifying the energy-levels of a 3-level system using the Stark effect, only at the time of operation.

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