Investigation into network architecture and modulation scheme for MIL‐STD‐1773 optical fiber data buses

Zhang, Jianguo; Sharma, A.; Ni, Yu-De; Zheng, Lianyu

doi:10.1108/00022660010325229

Cited by 3 publications

(2 citation statements)

References 5 publications

(4 reference statements)

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“…Similarly, all the optical multiports currently in use, such as tritters, share the same directionally-biased behavior [20,21]. The multiports considered here have some similarities with a previously-introduced type of nondirectional coupler known as reflective star couplers [22,23]. However, unlike star couplers, the directionally unbiased multiports discussed here have relative output amplitudes at each port that can be readily tuned to desired values without dynamically changing splitting ratios of beam splitters.…”

Section: Introductionmentioning

confidence: 91%

Experimental demonstration of a directionally-unbiased linear-optical multiport

Osawa

Simon

2018

Opt. Express

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All existing optical quantum walk approaches are based on the use of beamsplitters and multiple paths to explore the multitude of unitary transformations of quantum amplitudes in a Hilbert space. The beamsplitter is naturally a directionally biased device: the photon cannot travel in reverse direction. This causes rapid increases in optical hardware resources required for complex quantum walk applications, since the number of options for the walking particle grows with each step. Here we present the experimental demonstration of a directionally-unbiased linear-optical multiport, which allows reversibility of photon direction. An amplitude-controllable probability distribution matrix for a unitary three-edge vertex is reconstructed with only linear-optical devices. Such directionally-unbiased multiports allow direct execution of quantum walks over a multitude of complex graphs and in tensor networks. This approach would enable simulation of complex Hamiltonians of physical systems and quantum walk applications in a more efficient and compact setup, substantially reducing the required hardware resources.

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Section: Introductionmentioning

confidence: 91%

Experimental demonstration of a directionally-unbiased linear-optical multiport

Osawa

Simon

2018

Opt. Express

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“…In this section, directionally-unbiased optical devices will be introduced. Some types of directionally-unbiased systems have existed in the literature for a long time [ 55 , 56 ], while new beam splitter-based designs have been introduced recently [ 43 , 57 ]. The new beam splitter-based design will be reviewed first, and then, a directionally-unbiased design based on an optical tritter will be introduced.…”

Section: Directionally-unbiased Linear-optical Designsmentioning

confidence: 99%

Directionally-Unbiased Unitary Optical Devices in Discrete-Time Quantum Walks

Osawa

Simon

2019

Entropy

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The optical beam splitter is a widely-used device in photonics-based quantum information processing. Specifically, linear optical networks demand large numbers of beam splitters for unitary matrix realization. This requirement comes from the beam splitter property that a photon cannot go back out of the input ports, which we call "directionally-biased". Because of this property, higher dimensional information processing tasks suffer from rapid device resource growth when beam splitters are used in a feed-forward manner. Directionally-unbiased linear-optical devices have been introduced recently to eliminate the directional bias, greatly reducing the numbers of required beam splitters when implementing complicated tasks. Analysis of some originally directional optical devices and basic principles of their conversion into directionally-unbiased systems form the base of this paper. Photonic quantum walk implementations are investigated as a main application of the use of directionally-unbiased systems. Several quantum walk procedures executed on graph networks constructed using directionally-unbiased nodes are discussed. A significant savings in hardware and other required resources when compared with traditional directionally-biased beam-splitter-based optical networks is demonstrated. Keywords: quantum walks; linear optics; quantum information processing 2 of 32The increase in dimensionality enables employing and manipulating more information, and this needs to be achieved in a coherent way. Optical networks are constructed to perform this task by constructing higher dimensional unitary matrices. It is known that higher dimensional unitary matrices can be decomposed using lower dimensional unitary matrices. By repeating this procedure, any complex unitary matrix can be eventually decomposed using only two-dimensional ones. The Reck decomposition model has been introduced to describe this procedure [11]. A symmetric version of the Reck model is often called the Clements model [12]. For instance, these two models have been used by researchers in designing and building experimental linear-optical networks for boson sampling purposes [13][14][15][16]. During the boson sampling process, photons propagate from one side of a complex nodal structure to the other side of the optical network, thus performing a computational task. Direct implementation of multimode optical device has been experimentally verified in integrated platforms [17][18][19][20]. Quantum walks over the network of quantum nodes represent another form of quantum information processing, as an alternative to the quantum gate model. QW can also perform certain computations more efficiently than classical algorithms [6,[21][22][23][24][25][26][27][28]. Quantum walks in 1D and 2D systems have been experimentally demonstrated in optical systems [29][30][31][32][33][34][35][36][37][38][39][40].The traditional quantum walk approach uses a coin operator and a shift operator to execute each elementary step. An alternative description of a quantum walk can be impl...

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