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- Fewer parameters: 2d versus O(d^2)
Researchers found interferometers where the number of controllable parameters scales as 2d, instead of O(d²). A photon-number estimation protocol for multi-photon Fock states was developed.
- Field
- tools and releases
- What they did
- The researchers developed a specific architecture for programmable linear-optical interferometers that requires significantly fewer parameters to create unitary 1- and 2-designs compared to universal linear optics. They also created a practical protocol for estimating the number of photons in multi-photon Fock states using these optimized designs.
- Why it matters
- This allows for the accurate reproduction of Haar-averaged first moments using shallow interferometers, which can be applied to benchmark ensembles via single-photon transition probabilities and average channel fidelities.
#quantum computing#linear-optical interferometers#unitary t-designs#multi-photon fock space#quantum algorithms
