Efficient backcasting search for optical quantum state synthesis

Understand

Non-Gaussian states are essential for many optical quantum technologies.

• The so-called optical quantum state synthesizer (OQSS), consisting of Gaussian input states, linear optics, and photon-number resolving detectors, is a promising method for non-Gaussian state preparation.
• However, an inevitable and crucial problem is the complexity of the numerical simulation of the state preparation on a classical computer.
• This problem makes it very challenging to generate important non-Gaussian states required for advanced quantum information processing.