Photon-photon correlations and entanglement in doped photonic crystals

Abstract

We consider a photonic crystal (PC) doped with four-level atoms whose intermediate transition is coupled near-resonantly with a photonic band-gap edge. We show that two photons, each coupled to a different atomic transition in such atoms, can manifest strong phase or amplitude correlations: One photon can induce a large phase shift on the other photon or trigger its absorption and thus operate as an ultrasensitive nonlinear photon-switch. These features allow the creation of entangled two-photon states and have unique advantages over previously considered media: (i) no control lasers are needed; (ii) the system parameters can be chosen to cause full two-photon entanglement via absorption; (iii) a number of PCs can be combined in a network.

Modified, expanded text; added references

References in corpus (4)

• Dark-State Polaritons in Electromagnetically Induced Transparency
• Nonlinear Optics and Quantum Entanglement of Ultra-Slow Single Photons
• Transparency Near a Photonic Band Edge
• On the possibility of quantum computation based on photon exchange interactions

Cited by in corpus (5)

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• Single photon quantum non-demolition in the presence of inhomogeneous broadening
• Thermal Baths as Quantum Resources: More Friends than Foes?
• Nonadiabatic decoherence control of qubits strongly coupled to continuum edge
• FWM in One-dimensional Nonlinear Photonic Crystal and Theoretical Investigation of Parametric Down Conversion Efficiency (Steady State Analysis)