Three-Way Entanglement and Three-Qubit Phase Gate Based on a Coherent Six-Level Atomic System
arXiv:quant-ph/0602215 · doi:10.1103/PhysRevA.74.012319
Abstract
We analyze the nonlinear optical response of a six-level atomic system under a configuration of electromagnetically induced transparency. The giant fifth-order nonlinearity generated in such a system with a relatively large cross-phase modulation effect can produce efficient three-way entanglement and may be used for realizing a three-qubit quantum phase gate. We demonstrate that such phase gate can be transferred to a Toffoli gate, facilitating practical applications in quantum information and computation.
10 pages, 2 figures
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- High-order optical nonlinearity at low light levels
- Highly Entangled Photons and Rapidly Responding Polarization Qubit Phase Gates in a Room-Temperature Active Raman Gain Medium