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{{short description|Computer that uses photons or light waves}}
'''Optical computing''' or '''photonic computing''' uses [[light wave]]s produced by [[laser]]s or incoherent sources for [[data processing]], data storage or [[data communication]] for [[computing]]. For decades, [[photon]]s have shown promise to enable a higher [[Bandwidth (signal processing)|bandwidth]] than the [[electron]]s used in conventional computers (see [[optical fiber]]s).
Most research projects focus on replacing current computer components with optical equivalents, resulting in an optical [[digital computer]] system processing [[binary data]]. This approach appears to offer the best short-term prospects for commercial optical computing, since optical components could be integrated into traditional computers to produce an optical-electronic hybrid. However, [[optoelectronic]] devices consume 30% of their energy converting electronic energy into photons and back; this conversion also slows the transmission of messages. All-optical computers eliminate the need for optical-electrical-optical (OEO) conversions, thus reducing electrical [[power consumption]].<ref>{{cite book |first=D.D. |last=Nolte |title=Mind at Light Speed: A New Kind of Intelligence |url=https://books.google.com/books?id=Q9lB-REWP5EC&pg=PA34 |date=2001 |publisher=Simon and Schuster |isbn=978-0-7432-0501-6 |page=34}}</ref>
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==Optical components for binary digital computer==
The fundamental building block of modern electronic computers is the [[transistor]]. To replace electronic components with optical ones, an equivalent [[optical transistor]] is required. This is achieved by [[crystal optics]] (using materials with a [[Refractive index#Nonlinearity|non-linear refractive index]]).<ref>{{Cite web |title=These Optical Gates Offer Electronic Access - IEEE Spectrum |url=https://spectrum.ieee.org/optical-computing-picosecond-gates |access-date=2022-12-30 |website=
| country = US
| number = 4382660
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}}</ref> can be used to create optical [[logic gate]]s,<ref name=jainprattpatent /> which in turn are assembled into the higher level components of the computer's [[central processing unit]] (CPU). These will be nonlinear optical crystals used to manipulate light beams into controlling other light beams.
Like any computing system, an optical computing system needs
# optical processor
# optical data transfer, e.g. fiber-optic cable
# [[optical storage]],<ref>{{Cite web|url=https://www.microsoft.com/en-us/research/video/project-silica-storing-data-in-glass|title=Project Silica|website=Microsoft Research|date=4 November 2019 |language=en-US|access-date=2019-11-07}}</ref>
# optical power source (light source)
Substituting electrical components will need data format conversion from photons to electrons, which will make the system slower.
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[[Optical cavity|Resonator]]s are especially useful in photonic logic, since they allow a build-up of energy from [[constructive interference]], thus enhancing optical nonlinear effects.
Other approaches that have been investigated include photonic logic at a [[Nanotechnology|molecular level]], using [[Photoluminescence|photoluminescent]] chemicals. In a demonstration, Witlicki et al. performed logical operations using molecules and [[surface enhanced Raman spectroscopy|SERS]].<ref>{{cite journal | title = Molecular Logic Gates Using Surface-Enhanced Raman-Scattered Light | first9 = Amar H. | last9 = Flood | first8 = Lasse | last8 = Jensen | first7 = Eric W. | last7 = Wong | first6 = Jan O. | last6 = Jeppesen | first5 = Vincent J. | last5 = Bottomley | first4 = Daniel W. | last4 = Silverstein | first3 = Stinne W. | last3 = Hansen | journal = [[J. Am. Chem. Soc.]] | first2 = Carsten | date = 2011 | volume = 133 | issue = 19 | last2 = Johnsen | pages = 7288–91 | doi = 10.1021/ja200992x | pmid = 21510609 | first1 = Edward H. | last1 = Witlicki | bibcode = 2011JAChS.133.7288W | url = https://figshare.com/articles/Molecular_Logic_Gates_Using_Surface_Enhanced_Raman_Scattered_Light/2651761 | url-access = subscription }}</ref>
==Unconventional approaches==
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=== On-Chip Photonic Tensor Cores ===
With increasing demands on graphical processing unit-based accelerator technologies, in the second decade of the 21st century, there has been a huge emphasis on the use of on-chip integrated optics to create photonics-based processors. The emergence of both deep learning neural networks based on phase modulation,<ref>{{Cite journal |last1=Shen |first1=Yichen |last2=Harris |first2=Nicholas C. |last3=Skirlo |first3=Scott |last4=Prabhu |first4=Mihika |last5=Baehr-Jones |first5=Tom |last6=Hochberg |first6=Michael |last7=Sun |first7=Xin |last8=Zhao |first8=Shijie |last9=Larochelle |first9=Hugo |last10=Englund |first10=Dirk |last11=Soljačić |first11=Marin |date=July 2017 |title=Deep learning with coherent nanophotonic circuits |url=https://www.nature.com/articles/nphoton.2017.93 |journal=Nature Photonics |language=en |volume=11 |issue=7 |pages=441–446 |doi=10.1038/nphoton.2017.93 |arxiv=1610.02365 |bibcode=2017NaPho..11..441S |s2cid=13188174 |issn=1749-4893}}</ref> and more recently amplitude modulation using photonic memories <ref>{{Cite journal |last1=Ríos |first1=Carlos |last2=Youngblood |first2=Nathan |last3=Cheng |first3=Zengguang |last4=Le Gallo |first4=Manuel |last5=Pernice |first5=Wolfram H. P. |last6=Wright |first6=C. David |last7=Sebastian |first7=Abu |last8=Bhaskaran |first8=Harish |date=February 2019 |title=In-memory computing on a photonic platform |journal=Science Advances |language=en |volume=5 |issue=2 |pages=eaau5759 |doi=10.1126/sciadv.aau5759 |issn=2375-2548 |pmc=6377270 |pmid=30793028|arxiv=1801.06228 |bibcode=2019SciA....5.5759R }}</ref> have created a new area of photonic technologies for neuromorphic computing,<ref>{{Cite book |last1=Prucnal |first1=Paul R. |url=https://books.google.com/books?id=VbvODgAAQBAJ |title=Neuromorphic Photonics |last2=Shastri |first2=Bhavin J. |date=2017-05-08 |publisher=CRC Press |isbn=978-1-4987-2524-8 |language=en}}</ref><ref>{{Cite journal |last1=Shastri |first1=Bhavin J. |last2=Tait |first2=Alexander N. |last3=Ferreira de Lima |first3=T. |last4=Pernice |first4=Wolfram H. P. |last5=Bhaskaran |first5=Harish |last6=Wright |first6=C. D. |last7=Prucnal |first7=Paul R. |date=February 2021 |title=Photonics for artificial intelligence and neuromorphic computing |url=https://www.nature.com/articles/s41566-020-00754-y |journal=Nature Photonics |language=en |volume=15 |issue=2 |pages=102–114 |doi=10.1038/s41566-020-00754-y |arxiv=2011.00111 |bibcode=2021NaPho..15..102S |s2cid=256703035 |issn=1749-4893}}</ref> leading to new photonic computing technologies, all on a chip such as the photonic tensor core.<ref>{{Cite journal |last1=Feldmann |first1=J. |last2=Youngblood |first2=N. |last3=Karpov |first3=M. |last4=Gehring |first4=H. |last5=Li |first5=X. |last6=Stappers |first6=M. |last7=Le Gallo |first7=M. |last8=Fu |first8=X. |last9=Lukashchuk |first9=A. |last10=Raja |first10=A. S. |last11=Liu |first11=J. |last12=Wright |first12=C. D. |last13=Sebastian |first13=A. |last14=Kippenberg |first14=T. J. |last15=Pernice |first15=W. H. P. |date=January 2021 |title=Parallel convolutional processing using an integrated photonic tensor core |url=https://www.nature.com/articles/s41586-020-03070-1 |journal=Nature |language=en |volume=589 |issue=7840 |pages=52–58 |doi=10.1038/s41586-020-03070-1 |pmid=33408373 |arxiv=2002.00281 |bibcode=2021Natur.589...52F |hdl=10871/124352 |s2cid=256823189 |issn=1476-4687}}</ref>
===Wavelength-based computing===
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===Masking optical beams===
The [[travelling salesman problem]] has been solved by Shaked ''et al.'' (2007)<ref>{{cite journal| author= NT Shaked, S Messika, S Dolev, J Rosen |title=Optical solution for bounded NP-complete problems|journal= Applied Optics|pages=711–724|volume=46|issue=5|date=2007|doi=10.1364/AO.46.000711|pmid=17279159|bibcode=2007ApOpt..46..711S|s2cid=17440025}}</ref> by using an optical approach. All possible TSP paths have been generated and stored in a binary matrix which was multiplied with another gray-scale vector containing the distances between cities. The multiplication is performed optically by using an optical correlator.
===Optical Fourier co-processors===
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[[Yoshihisa Yamamoto (scientist)|Yoshihisa Yamamoto]]'s lab at [[Stanford University|Stanford]] pioneered building Ising machines using photons. Initially Yamamoto and his colleagues built an Ising machine using lasers, mirrors, and other optical components commonly found on an [[optical table]].<ref name="courtland" /><ref name="cartlidge">{{Cite news |first=Edwin |last=Cartlidge |url=http://physicsworld.com/cws/article/news/2016/oct/31/new-ising-machine-computers-are-taken-for-a-spin |title=New Ising-machine computers are taken for a spin |date=31 October 2016 |work=Physics World}}</ref>
Later a team at [[Hewlett Packard Labs]] developed [[photonic chip]] design tools and used them to build an Ising machine on a single chip, integrating 1,052 optical components on that single chip.<ref name="courtland">{{Cite news |first=Rachel |last=Courtland |url=https://spectrum.ieee.org
==Industry==
Some additional companies involved with optical computing development include [[IBM]],<ref>{{Cite web |first= Daphne |last=Leprince-Ringuet |date=2021-01-08 |title=IBM is using light, instead of electricity, to create ultra-fast computing |url=https://www.zdnet.com/article/ibm-is-using-light-instead-of-electricity-to-create-ultra-fast-computing/ |access-date=2023-07-02 |website=ZDNET |language=en}}</ref> [[Microsoft]],<ref>{{Cite news |last=Wickens |first=Katie |date=2023-06-30 |title=Microsoft's light-based computer marks 'the unravelling of Moore's Law' |language=en |work=PC Gamer |url=https://www.pcgamer.com/microsofts-light-based-computer-marks-the-unravelling-of-moores-law/ |access-date=2023-07-02}}</ref>
==See also==
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*[[Photonic molecule]]
*[[Photonic transistor]]
*[[Programmable photonics]]
*[[Silicon photonics]]
*[[Unconventional computing]]
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* {{cite book |first1=S. |last1=Dolev |first2=M. |last2=Oltean |title=Optical Supercomputing: 4th International Workshop, OSC 2012, in Memory of H. John Caulfield, Bertinoro, Italy, July 19–21, 2012. Revised Selected Papers |url=https://books.google.com/books?id=Sy-7BQAAQBAJ |date=2013 |publisher=Springer |isbn=978-3-642-38250-5}}
* [https://web.archive.org/web/20090913002603/http://www.newscientist.com/article/mg19526136.400-speedoflight-computing-comes-a-step-closer.html Speed-of-light computing comes a step closer] ''New Scientist''
* {{cite journal |author= Caulfield H.|author2= Dolev S.|title= Why future supercomputing requires optics| journal= Nature Photonics| volume=4 |issue= 5|pages=261–263 |date=2010 |doi=10.1038/nphoton.2010.94|bibcode= 2010NaPho...4..261C}}
* {{cite journal |author= Cohen E.|author2= Dolev S.|author3=Rosenblit M.| title= All-optical design for inherently energy-conserving reversible gates and circuits| journal= Nature Communications| volume=7 |pages=11424 |date=2016 |doi=10.1038/ncomms11424 | pmid=27113510 | pmc=4853429|bibcode=2016NatCo...711424C}}
* {{cite book |first1=Yevgeny B.|last1=Karasik |title=Optical Computational Geometry |url=https://www.amazon.com/Optical-Computational-Geometry-computational-constructions-dp-B095MQJ8NJ/dp/B095MQJ8NJ |date=2019 |isbn=979-8511243344}}
==External links==
{{Commons category-inline}}
* [https://www.wired.com/news/technology/0,1282,69033,00.html?tw=newsletter_topstories_html This Laser Trick's a Quantum Leap]
* [http://www.extremetech.com/article2/0,1558,1779951,00.asp Photonics Startup Pegs Q2'06 Production Date] {{Webarchive|url=https://archive.
* [http://www.physorg.com/news6123.html Stopping light in quantum leap]
* [http://www.physorg.com/news199470370.html High Bandwidth Optical Interconnects]
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[[Category:Photonics]]
[[Category:Classes of computers]]
[[Category:Models of computation]]
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