Reducing circuit complexity in optical quantum computation using 3D architectures

Wenhao Zhou

doi:10.1364/OE.464108

2022-08-24

Wenhao Zhou

Madhav Krishnan Vijayan

DOI：10.1364/OE.464108

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Integrated photonic architectures based on optical waveguides are one of the leading candidates for the future realisation of large-scale quantum computation. One of the central challenges in realising this goal is simultaneously minimising loss whilst maximising interferometric visibility within waveguide circuits. One approach is to reduce circuit complexity and depth. A major constraint in most planar waveguide systems is that beamsplitter transformations between distant optical modes require numerous intermediate SWAP operations to couple them into nearest neighbour proximity, each of which introduces loss and scattering. Here, we propose a 3D architecture which can significantly mitigate this problem by geometrically bypassing trivial intermediate operations. We demonstrate the viability of this concept by considering a worst-case 2D scenario, where we interfere the two most distant optical modes in a planar structure. Using femtosecond laser direct-writing technology we experimentally construct a 2D architecture to implement Hong-Ou-Mandel interference between its most distant modes, and a 3D one with corresponding physical dimensions, demonstrating significant improvement in both fidelity and efficiency in the latter case. In addition to improving fidelity and efficiency of individual non-adjacent beamsplitter operations, this approach provides an avenue for reducing the optical depth of circuits comprising complex arrays of beamsplitter operations. (C) 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement

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REALIZATION

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期刊

Optics Express

IF:

3.3

论文数:

6.1W

被引数:

14.3W

机构

shanghai jiao tong university

学者数:

15.7W

论文数: 11.7W

被引数: 159

university of science & technology of china, cas

学者数:

3.2W

论文数: 2.7W

被引数: 74

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