Optimizing spontaneous parametric down-conversion sources for boson sampling

Understand

An important step for photonic quantum technologies is the demonstration of a quantum advantage through boson sampling.

• In order to prevent classical simulability of boson sampling, the photons need to be almost perfectly identical and almost without losses.
• These two requirements are connected through spectral filtering, improving one leads to a decrease of the other.
• A proven method of generating single photons is spontaneous parametric downconversion (SPDC).