Integrated multimode interferometers with arbitrary designs for photonic boson sampling
Abstract
The evolution of bosons undergoing arbitrary linear unitary transformations quickly becomes hard to predict using classical computers as we increase the number of particles and modes. Photons propagating in a multiport interferometer naturally solve this socalled boson sampling problem, thereby motivating the development of technologies that enable precise control of multiphoton interference in large interferometers. Here, we use novel threedimensional manufacturing techniques to achieve simultaneous control of all the parameters describing an arbitrary interferometer. We implement a small instance of the boson sampling problem by studying threephoton interference in a fivemode integrated interferometer, confirming the quantummechanical predictions. Scaledup versions of this setup are a promising way to demonstrate the computational advantage of quantum systems over classical computers. The possibility of implementing arbitrary linearoptical interferometers may also find applications in highprecision measurements and quantum communication.
 Publication:

Nature Photonics
 Pub Date:
 July 2013
 DOI:
 10.1038/nphoton.2013.112
 arXiv:
 arXiv:1212.2783
 Bibcode:
 2013NaPho...7..545C
 Keywords:

 Quantum Physics;
 Physics  Computational Physics;
 Physics  Optics
 EPrint:
 6 pages + 4 pages (Supplementary Information), 4 figures + 2 figures