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Quantum algorithm
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===Quantum simulation=== {{main|Hamiltonian simulation}} The idea that quantum computers might be more powerful than classical computers originated in Richard Feynman's observation that classical computers seem to require exponential time to simulate many-particle quantum systems, yet quantum many-body systems are able to "solve themselves."<ref> {{Cite journal | last1=Feynman | first1=R. P. | year=1982 | title=Simulating physics with computers | journal=[[International Journal of Theoretical Physics]] | volume=21 | issue=6β7 | pages=467β488 | bibcode = 1982IJTP...21..467F | doi = 10.1007/BF02650179 | citeseerx=10.1.1.45.9310 | s2cid=124545445 }}</ref> Since then, the idea that quantum computers can simulate quantum physical processes exponentially faster than classical computers has been greatly fleshed out and elaborated. Efficient (i.e., polynomial-time) quantum algorithms have been developed for simulating both Bosonic and Fermionic systems,<ref> {{Cite journal | last1=Abrams |first1=D. S. | last2=Lloyd | first2=S. | year=1997 | title=Simulation of many-body Fermi systems on a universal quantum computer | journal=[[Physical Review Letters]] | volume=79 | issue=13 | pages=2586β2589 | arxiv = quant-ph/9703054 | bibcode=1997PhRvL..79.2586A | doi=10.1103/PhysRevLett.79.2586 |s2cid=18231521 }}</ref> as well as the simulation of chemical reactions beyond the capabilities of current classical supercomputers using only a few hundred qubits.<ref> {{Cite journal | last1=Kassal | first1=I. | last2=Jordan | first2=S. P. | last3=Love | first3=P. J. | last4=Mohseni | first4=M. | last5=Aspuru-Guzik | first5=A. | year=2008 | title=Polynomial-time quantum algorithm for the simulation of chemical dynamics | journal=[[Proceedings of the National Academy of Sciences of the United States of America]] | volume=105 |issue=48 | pages=18681β86 | arxiv= 0801.2986 | bibcode = 2008PNAS..10518681K | doi=10.1073/pnas.0808245105 | pmc=2596249 | pmid=19033207 | doi-access=free }}</ref> Quantum computers can also efficiently simulate topological quantum field theories.<ref> {{Cite journal | last1=Freedman | first1=M. | last2=Kitaev | first2=A. | last3=Wang | first3=Z. | year=2002 | title=Simulation of Topological Field Theories by Quantum Computers | journal=[[Communications in Mathematical Physics]] | volume=227 | issue=3 | pages=587β603 | arxiv = quant-ph/0001071 | bibcode = 2002CMaPh.227..587F | doi=10.1007/s002200200635 | s2cid=449219 }}</ref> In addition to its intrinsic interest, this result has led to efficient quantum algorithms for estimating [[Quantum invariant|quantum topological invariants]] such as [[Jones polynomial|Jones]]<ref> {{Cite journal | last1=Aharonov | first1=D. | last2=Jones | first2=V. | last3=Landau | first3=Z. | year=2009 | title=A polynomial quantum algorithm for approximating the Jones polynomial | journal=[[Algorithmica]] | volume=55 | issue=3 | pages=395β421 | arxiv=quant-ph/0511096 | doi=10.1007/s00453-008-9168-0 | s2cid=7058660 }}</ref> and [[HOMFLY polynomial]]s,<ref> {{Cite journal | last1=Wocjan |first1=P. | last2=Yard | first2=J. | year=2008 | title=The Jones polynomial: quantum algorithms and applications in quantum complexity theory | journal=[[Quantum Information and Computation]] | volume=8 | issue=1 | pages=147β180 |doi=10.26421/QIC8.1-2-10 | arxiv=quant-ph/0603069 |bibcode = 2006quant.ph..3069W |s2cid=14494227 }}</ref> and the [[Turaev-Viro invariant]] of three-dimensional manifolds.<ref> {{Cite journal |last1=Alagic | first1=G. |last2=Jordan | first2=S.P. |last3=KΓΆnig | first3=R. |last4=Reichardt | first4=B. W. |year=2010 |title=Approximating Turaev-Viro 3-manifold invariants is universal for quantum computation |journal=[[Physical Review A]] |volume=82 |issue=4 |pages=040302 |arxiv=1003.0923 |bibcode=2010PhRvA..82d0302A |doi=10.1103/PhysRevA.82.040302 | s2cid=28281402 }}</ref>
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