Knowledge (XXG)

Counterfactual quantum computation

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mirror array replaces the tentative bomb in Elitzur and Vaidman's device (actually a Mach–Zehnder interferometer). One time in four a photon will exit the device in such a way as to indicate that the maze is not navigable, even though the photon never passed through the mirror array. The mirror array itself is set up in such a way that it is defined by an
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and Richard Jozsa, and inspired by the idea of the (1993) Elitzur-Vaidman bomb tester, Keith Bowden (Birkbeck College) published a paper describing a digital computer that could be counterfactually interrogated to calculate whether a photon would fail to pass through a maze of mirrors. This so-called
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In 2015, counterfactual quantum computation was demonstrated in the experimental context of "spins of a negatively charged nitrogen-vacancy color center in a diamond". Previously suspected limits of efficiency were exceeded, achieving counterfactual computational efficiency of 85% with the higher
159:-squared bit in, 1 bit out digital computer which calculates mazes and can be run counterfactually. Although the overall device is clearly a quantum computer, the part which is counterfactually tested is semi classical. 129:
of measurement outcomes is a counterfactual outcome if (iv) there are no terms left with the computer-running label in their history labels, and (v) there is only a single possible computer output associated to
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A refined definition of counterfactual computation expressed in procedures and conditions is: (i) Identify and label all histories (quantum paths), with as many labels as needed, which lead to the same set
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published a paper in 1997 describing a digital computer that could be counterfactually interrogated to calculate whether a light beam would fail to pass through a maze as an example of this idea.
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of measurement outcomes, and (ii) coherently superpose all possible histories. (iii) After cancelling the terms (if any) whose complex amplitudes together add to zero, the set
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Hosten, Onur; Rakher, Matthew T.; Barreiro, Julio T.; Peters, Nicholas A.; Kwiat, Paul (Jun 26, 2006). "Counterfactual computation revisited".
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and that history contains only "off" (non-running) states, and there is only a single possible computational output associated to
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Bowden, Keith G, "Classical Computation can be Counterfactual", in Aspects I, Proc ANPA19, Cambridge 1997 (published May 1999),
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The quantum computer may be physically implemented in arbitrary ways but, to date, the common apparatus considered features a
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Kong, Fei; Ju, Chenyong; Huang, Pu; Wang, Pengfei; Kong, Xi; Shi, Fazhan; Jiang, Liang; Du, Jiangfeng (August 21, 2015).
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matrix of bits. The output (fail or otherwise) is itself defined by a single bit. Thus the mirror array itself is an
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introduced the notion of counterfactual computing as an application of quantum computing, founded on the concepts of
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Liu Y, et al. (2012) "Experimental demonstration of counterfactual quantum communication". Phys Rev Lett 109:030501
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More recently the idea of counterfactual quantum communication has been proposed and demonstrated.
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Mitchison, Graeme; Jozsa, Richard (February 1, 2008). "The limits of counterfactual computation".
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of measurement outcomes is a counterfactual outcome if there is only one history associated to
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even though the result was derived from the non-running state of the quantum computer.
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The original formulation of counterfactual quantum computation stated that a set
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that value allows for learning the result of some types of computations such as
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is a method of inferring the result of a computation without actually running a
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Mitchison, Graeme; Jozsa, Richard (May 8, 2001). "Counterfactual computation".
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Hosten, Onur; Rakher, Matthew T.; Barreiro, Julio T.; Peters, Nicholas A.;
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thought experiment, and making theoretical use of the phenomenon of
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After seeing a talk on counterfactual computation by Jozsa at the
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of "not running" and "running" states by means such as the
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otherwise capable of actively performing that computation.
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The quantum computer is set in a 1638:Integrated development environment 168:efficiency foreseen in principle. 17:Counterfactual quantum computation 14: 2106:Automated planning and scheduling 1643:Software configuration management 2360: 2350: 2341: 2340: 1348: 1347: 1338: 1337: 142:In 1997, after discussions with 43:, on a re-interpretation of the 2351: 1754:Computational complexity theory 1545:Network performance evaluation 433:10.1103/PhysRevLett.115.080501 1: 1909:Multimedia information system 1894:Geographic information system 1884:Enterprise information system 1480:Computer systems organization 1014:Adiabatic quantum computation 2268:Computational social science 1856:Theoretical computer science 1676:Software development process 1452:Electronic design automation 1437:Very Large Scale Integration 1065:Topological quantum computer 463:. Omicron Technology Limited 273:Bowden, Keith (1997-03-15). 85:. Those state histories are 49:interaction-free measurement 2387:Quantum information science 2091:Natural language processing 1879:Information storage systems 1343:Quantum information science 510:Quantum information science 75:Mach–Zehnder interferometer 45:Elitzur–Vaidman bomb tester 41:counterfactual definiteness 2403: 2007:Human–computer interaction 1977:Intrusion detection system 1889:Social information systems 1874:Database management system 738:quantum gate teleportation 163:Experimental demonstration 2336: 2273:Computational engineering 2248:Computational mathematics 1401: 1333: 867:Quantum Fourier transform 763:Post-quantum cryptography 706:Entanglement distillation 2283:Computational healthcare 2278:Differentiable computing 2197:Graphics processing unit 1623:Domain-specific language 1492:Computational complexity 1353:Quantum mechanics topics 1048:Quantum machine learning 1024:One-way quantum computer 877:Quantum phase estimation 778:Quantum key distribution 711:Monogamy of entanglement 2258:Computational chemistry 2192:Photograph manipulation 2083:Artificial intelligence 1899:Decision support system 960:Randomized benchmarking 822:Amplitude amplification 412:Physical Review Letters 2323:Educational technology 2154:Reinforcement learning 1904:Process control system 1802:Computational geometry 1792:Algorithmic efficiency 1787:Analysis of algorithms 1442:Systems on Chip (SoCs) 1060:Quantum Turing machine 1053:quantum neural network 800:Quantum secret sharing 230:10.1098/rspa.2000.0714 56:Isaac Newton Institute 2293:Electronic publishing 2263:Computational biology 2253:Computational physics 2149:Unsupervised learning 2063:Distributed computing 1939:Information retrieval 1846:Mathematical analysis 1836:Mathematical software 1726:Theory of computation 1691:Software construction 1681:Requirements analysis 1559:Software organization 1487:Computer architecture 1457:Hardware acceleration 1422:Printed circuit board 1132:Entanglement-assisted 1093:quantum convolutional 768:Quantum coin flipping 733:Quantum teleportation 694:entanglement-assisted 524:DiVincenzo's criteria 69:Outline of the method 2053:Concurrent computing 2025:Ubiquitous computing 1997:Application security 1992:Information security 1821:Discrete mathematics 1797:Randomized algorithm 1749:Computability theory 1734:Model of computation 1706:Software maintenance 1701:Software engineering 1663:Software development 1613:Programming language 1608:Programming paradigm 1525:Network architecture 943:processor benchmarks 872:Quantum optimization 755:Quantum cryptography 566:physical vs. logical 2328:Document management 2318:Operations research 2243:Enterprise software 2159:Multi-task learning 2144:Supervised learning 1866:Information systems 1696:Software deployment 1653:Software repository 1507:Real-time computing 656:Quantum speed limit 551:Quantum programming 546:Quantum information 424:2015PhRvL.115h0501K 335:10.1038/nature04523 327:2006Natur.439..949H 212:2001RSPSA.457.1175M 196:(2009): 1175–1193. 83:quantum Zeno effect 2111:Search methodology 2058:Parallel computing 2015:Interaction design 1924:Computing platform 1851:Numerical analysis 1841:Information theory 1633:Software framework 1596:Software notations 1535:Network components 1432:Integrated circuit 1305:Forest/Rigetti QCS 1041:quantum logic gate 827:Bernstein–Vazirani 814:Quantum algorithms 689:Classical capacity 573:Quantum processors 556:Quantum simulation 95:Grover's algorithm 87:quantum interfered 2374: 2373: 2303:Electronic voting 2233:Quantum Computing 2226:Applied computing 2212:Image compression 1982:Hardware security 1972:Security services 1929:Digital marketing 1716:Open-source model 1628:Modeling language 1540:Network scheduler 1361: 1360: 1272: 1271: 1169:Linear optical QC 950:Quantum supremacy 904:complexity theory 857:Quantum annealing 808: 807: 745:Superdense coding 534:Quantum computing 321:(7079): 949–952. 27:Conceptual origin 2394: 2364: 2363: 2354: 2353: 2344: 2343: 2164:Cross-validation 2136:Machine learning 2020:Social computing 1987:Network security 1782:Algorithm design 1711:Programming team 1671:Control variable 1648:Software library 1586:Software quality 1581:Operating system 1530:Network protocol 1395:Computer science 1388: 1381: 1374: 1365: 1351: 1350: 1341: 1340: 1147: 1077:error correction 1006:computing models 972:Relaxation times 862:Quantum counting 751: 699:quantum capacity 646:No-teleportation 631:No-communication 503: 496: 489: 480: 473: 472: 470: 468: 452: 446: 445: 435: 403: 397: 396: 394: 392:quant-ph/0607101 382: 376: 375: 373: 371:quant-ph/0606092 361: 355: 354: 306: 300: 297: 291: 289: 287: 286: 277:. Archived from 270: 261: 251: 242: 241: 223: 205: 203:quant-ph/9907007 185: 33:Graeme Mitchison 21:quantum computer 2402: 2401: 2397: 2396: 2395: 2393: 2392: 2391: 2377: 2376: 2375: 2370: 2361: 2332: 2313:Word processing 2221: 2207:Virtual reality 2168: 2130: 2101:Computer vision 2077: 2073:Multiprocessing 2039: 2001: 1967:Security hacker 1943: 1919:Digital library 1860: 1811:Mathematics of 1806: 1768: 1744:Automata theory 1739:Formal language 1720: 1686:Software design 1657: 1590: 1576:Virtual machine 1554: 1550:Network service 1511: 1502:Embedded system 1475: 1408: 1397: 1392: 1362: 1357: 1329: 1279: 1268: 1241:Superconducting 1235: 1201: 1192:Neutral atom QC 1184:Ultracold atoms 1178: 1143:implementations 1142: 1136: 1076: 1069: 1036:Quantum circuit 1004: 998: 992: 982: 942: 936: 903: 896: 852:Hidden subgroup 804: 793:other protocols 749: 726:quantum network 721:Quantum channel 681: 675: 621:No-broadcasting 611:Gottesman–Knill 584: 512: 507: 477: 476: 466: 464: 454: 453: 449: 405: 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Index

quantum computer
Graeme Mitchison
Richard Jozsa
counterfactual definiteness
Elitzur–Vaidman bomb tester
interaction-free measurement
Isaac Newton Institute
Birkbeck College, University of London
Mach–Zehnder interferometer
superposition
quantum Zeno effect
quantum interfered
Measuring
Grover's algorithm
Abner Shimony


arXiv
quant-ph/9907007
Bibcode
2001RSPSA.457.1175M
CiteSeerX
10.1.1.251.9270
doi
10.1098/rspa.2000.0714
S2CID
16208575


ISBN

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