*Quantum Path Computing*
Burhan Gulbahar
October 31, 2017
https://arxiv.org/abs/1709.00735 

*Double slit interference experiment is fundamental for quantum mechanics 
(QM) presenting wave-particle duality as emphasized by Richard Feynman. 
Previous quantum computing (QC) architectures with simple interference 
set-ups utilizing generally the wave nature and superposition have cost of 
exponential increase in resources of time, space or energy. In this 
article, wave-particle duality, tensor product Hilbert space of particle 
trajectory histories and Feynman's path integral formalism are combined in 
a simple multi-plane interference set-up with a novel QC architecture 
denoted by quantum path computing (QPC). It is theoretically valid for all 
particles including electrons, photons, neutrons and molecules possessing 
path integral based modeling of QM in slit based interference 
architectures. QPC solves specific instances of simultaneous Diophantine 
approximation problem (NP-hard) as an important application. It combines 
exponentially large number of trajectories exploiting the particle nature 
while performing interference measurements exploiting the wave nature. QPC 
does not explicitly require exponential complexity of resources by 
combining tensor product space of path history inherently existing in 
physical set-up and path integrals naturally including histories. Hidden 
subgroup problem is solved as a fundamental QC tool in analogy with period 
finding algorithms utilizing quantum gates and multiple qubit entanglement 
while determining computational complexity of solving capability is an open 
issue. In addition, single plane interference systems analyzing exotic 
paths are extended to multi-plane set-up while simulations consider 
non-negligible effects of multiple exotic paths. Challenges are discussed 
for modeling complexity and experimental aspects including source energy 
and detection sensitivity.*


cf.

*Quantum circuit dynamics via path integrals: Is there a classical action 
for discrete-time paths?*
Mark D Penney, Dax Enshan Koh, and Robert W Spekkens
July 6, 2017 
https://iopscience.iop.org/article/10.1088/1367-2630/aa61ba

*An Easy Case of Feynman's Path Integrals*
David Mumford
November 1, 2014
http://www.dam.brown.edu/people/mumford/blog/2014/FeynmanIntegral.html

*A histories perspective on characterizing quantum non-locality*
Fay Dowker, Joe Henson, and Petros Wallden
March 26, 2014
https://iopscience.iop.org/article/10.1088/1367-2630/16/3/033033/meta

*The sum-over-histories formulation of quantum computing*
Ben Rudiak-Gould
July 26, 2006
https://arxiv.org/abs/quant-ph/0607151




@philipthrift



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