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Ultrafast optical control of semiconductor spin qubits toward ...

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3rd Asia Pacific Physics Conference (World Scientific, Singapore, 1988) p.779<br />

Quantum mechanical aspects <strong>of</strong><br />

<strong>optical</strong> communication and <strong>optical</strong> computing<br />

Y. Yamamoto, M. Kitagawa and K. Igeta<br />

Basic Research Laboratories, Nippon Telegraph and Telephone Corporation<br />

Musashino-shi, Tokyo 180, Japan<br />

Controlled-NOT Gate for Flying Qubits<br />

using Nonlinear Interferometer<br />

<strong>control</strong><br />

|0 C / |1 C<br />

phase<br />

shift<br />

output 1<br />

output 2<br />

Controlled-Phase Gate for Matter Qubits<br />

using Stimulated Raman Scattering<br />

input 1<br />

|0 1 / |1 1<br />

A Fredkin gate using two three-level atoms<br />

and -pulse coherent state field<br />

input 2<br />

|0 2<br />

A nonlinear single photon interferometer<br />

operates as a Fredkin gate.<br />

2

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