Analysis of Photonic Quantum Nodes Based on Single Photon Raman Interaction

Understand

The long-standing goal of deterministically controlling a single photon using another was recently realized in various experimental settings.

• Among these, a particularly attractive demonstration relied on single-photon Raman interaction (SPRINT) in a three-level Lambda-system coupled to a single-mode waveguide.
• Beyond the ability to control the direction of propagation of one photon by the direction of another photon, this scheme has the potential to perform as a passive quantum memory and a universal quantum gate.
• Relying on interference, this all-optical, coherent scheme requires no additional control fields, and can therefore form the basis for scalable quantum networks composed of passive quantum nodes that interact with each other only with single photon pulses.