aqora

Quantum metrology in a multiport linear optical interferometer

Wenchao Ge, Michael Foss‐Feig, Kurt A. Jacobs

Bulletin of the American Physical SocietyJun 6, 20170 citations

Linear Optical Response

Springer eBooksJan 1, 20071 citation

Implementation of a 3 × 3 directionally-unbiased linear optical multiport

Ilhwan Kim, Donghwa Lee, Seongjin Hong +4 more

Linear optical multiports are widely used in photonic quantum information processing. Naturally, these devices are directionally-biased since photons always propagate from the input ports toward the output ports. Recently, the concept of directionally-unbiased linear optical multiports was proposed. These directionally-unbiased multiports allow photons to propagate along a reverse direction, which can greatly reduce the number of required linear optical elements for complicated linear optical quantum networks. Here, we report an experimental demonstration of a 3 × 3 directionally-unbiased linear optical fiber multiport using an optical tritter and mirrors. Compared to the previous demonstration using bulk optical elements which works only with light sources with a long coherence length, our experimental directionally-unbiased 3 × 3 optical multiport does not require a long coherence length since it provides negligible optical path length differences among all possible optical trajectories. It can be a useful building block for implementing large-scale quantum walks on complex graph networks.Linear optical multiports are widely used in photonic quantum information processing. Naturally, these devices are directionally-biased since photons always propagate from the input ports toward the output ports. Recently, the concept of directionally-unbiased linear optical multiports was proposed. These directionally-unbiased multiports allow photons to propagate along a reverse direction, which can greatly reduce the number of required linear optical elements for complicated linear optical quantum networks. Here, we report an experimental demonstration of a 3 × 3 directionally-unbiased linear optical fiber multiport using an optical tritter and mirrors. Compared to the previous demonstration using bulk optical elements which works only with light sources with a long coherence length, our experimental directionally-unbiased 3 × 3 optical multiport does not require a long coherence length since it provides negligible optical path length differences among all possible optical trajectories. It can be a useful building block for implementing large-scale quantum walks on complex graph networks.

arXiv:2106.13473Optics ExpressAug 20, 202114 citations

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

David S. Simon, Casey A. Fitzpatrick, Shuto Osawa +1 more

Recently, a generalization of the standard optical multiport was proposed [Phys. Rev. A 93, 043845 (2016)]. These directionally unbiased multiports allow photons to reverse direction and exit backwards from the input port, providing a realistic linear optical scattering vertex for quantum walks on arbitrary graph structures. Here, it is shown that arrays of these multiports allow the simulation of a range of discrete-time Hamiltonian systems. Examples are described, including a case where both spatial and internal degrees of freedom are simulated. Because input ports also double as output ports, there is substantial savings of resources compared to feed-forward networks carrying out the same functions. The simulation is implemented in a scalable manner using only linear optics, and can be generalized to higher dimensional systems in a straightforward fashion, thus offering a concrete experimentally achievable implementation of graphical models of discrete-time quantum systems.Recently, a generalization of the standard optical multiport was proposed [Phys. Rev. A 93, 043845 (2016)]. These directionally unbiased multiports allow photons to reverse direction and exit backwards from the input port, providing a realistic linear optical scattering vertex for quantum walks on arbitrary graph structures. Here, it is shown that arrays of these multiports allow the simulation of a range of discrete-time Hamiltonian systems. Examples are described, including a case where both spatial and internal degrees of freedom are simulated. Because input ports also double as output ports, there is substantial savings of resources compared to feed-forward networks carrying out the same functions. The simulation is implemented in a scalable manner using only linear optics, and can be generalized to higher dimensional systems in a straightforward fashion, thus offering a concrete experimentally achievable implementation of graphical models of discrete-time quantum systems.

arXiv:1704.03108Physical Review AApr 10, 201718 citations

Nonlinear computation with linear optics

Demetri Psaltis

SPIE Machine Learning in PhotonicsJun 18, 20240 citations

Directionally Unbiased Linear-Optical Multiports for Quantum Information Processing

Alexander V. Sergienko, David S. Simon, Casey A. Fitzpatrick

The concept of directionally unbiased optical multiport is introduced, in which photons may reflect back out the input direction. It acts as universal qubit and Bell-state processor to implement probabilistic quantum gates.

Conference on Lasers and Electro-OpticsJan 1, 20170 citations

Experimental Implementation of Directionally-Unbiased Linear-Optical Multiport

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