Boson sampling from a Gaussian state

Phys Rev Lett. 2014 Sep 5;113(10):100502. doi: 10.1103/PhysRevLett.113.100502. Epub 2014 Sep 5.


We pose a randomized boson-sampling problem. Strong evidence exists that such a problem becomes intractable on a classical computer as a function of the number of bosons. We describe a quantum optical processor that can solve this problem efficiently based on a Gaussian input state, a linear optical network, and nonadaptive photon counting measurements. All the elements required to build such a processor currently exist. The demonstration of such a device would provide empirical evidence that quantum computers can, indeed, outperform classical computers and could lead to applications.