Scalable photonic quantum computing assisted by quantum-dot spin in double-sided optical microcavity.
We investigate the possibility of achieving scalable photonic quantum computing by the giant optical circular birefringence induced by a quantum-dot spin in a double-sided optical microcavity as a result of cavity quantum electrodynamics. We construct a deterministic controlled-not gate on two photonic qubits by two single-photon input-output processes and the readout on an electron-medium spin confined in an optical resonant microcavity. This idea could be applied to multi-qubit gates on photonic qubits and we give the quantum circuit for a three-photon Toffoli gate. High fidelities and high efficiencies could be achieved when the side leakage to the cavity loss rate is low. It is worth pointing out that our devices work in both the strong and the weak coupling regimes.
Department of Physics, Applied Optics Beijing Area Major Laboratory, Beijing Normal University, Beijing 100875, China.
Hai-Rui
HR
Wei
Fu-Guo
FG
Deng
D003198:Computer Simulation; D017076:Computer-Aided Design; D039301:Computers, Molecular; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008027:Light; D008904:Miniaturization; D008962:Models, Theoretical; D045663:Quantum Dots; D011789:Quantum Theory; D012031:Refractometry / Q000295:instrumentation*; D012542:Scattering, Radiation; D013113:Spin Labels; D020349:Surface Plasmon Resonance / Q000295:instrumentation*
D013113:Spin Labels