Enhanced-sensitivity interferometry with phase-sensitive unbiased multiports

Group transformations and entangled-state quantum gates with directionally unbiased linear-optical multiports

David S. Simon,1,2,* Casey A. Fitzpatrick,2,† and Alexander V. Sergienko2,3,‡ 1Department of Physics and Astronomy, Stonehill College, 320 Washington Street, Easton, Massachusetts 02357, USA 2Department of Electrical and Computer Engineering & Photonics Center, Boston University, 8 Saint Mary’s Street, Boston, Massachusetts 02215, USA 3Department of Physics, Boston University, 590 Commonwealth ...

Phase-noise protection in quantum-enhanced differential interferometry

Differential interferometry (DI) with two coupled sensors is a most powerful approach for precision measurements in the presence of strong phase noise. However, DI has been studied and implemented only with classical resources. Here we generalize the theory of differential interferometry to the case of entangled probe states. We demonstrate that, for perfectly correlated interferometers and in ...

Enhanced depth resolution in terahertz imaging using phase-shift interferometry

We describe an imaging technique for few-cycle optical pulses. An object to be imaged is placed at the focus of a lens in one arm of a Michaelson interferometer. This introduces a phase shift of approximately p between the two arms of the interferometer, via the Gouy phase shift. The resulting destructive interference provides a nearly background-free measurement, and a dramatic enhancement in ...

Quantum simulation of discrete-time Hamiltonians using directionally unbiased linear optical multiports

David S. Simon,1,2,* Casey A. Fitzpatrick,2,† Shuto Osawa,2,‡ and Alexander V. Sergienko2,3,§ 1Department of Physics and Astronomy, Stonehill College, 320 Washington Street, Easton, Massachusetts 02357, USA 2Department of Electrical and Computer Engineering & Photonics Center, Boston University, 8 Saint Mary’s St., Boston, Massachusetts 02215, USA 3Department of Physics, Boston University, 590 ...

Quantum Simulation of Complex Physical Hamiltonians using Directionally Unbiased Linear-Optical Multiports