
1.National Laboratory of Solid State Microstructures, Key Laboratory of Intelligent Optical Sensing and Manipulation (Ministry of Education) and College of Engineering and Applied Sciences, Nanjing University, 210093, Nanjing, China
2.Collaborative Innovation Center of Advanced Microstructures, Nanjing University, 210093, Nanjing, China
3.State Key Laboratory for Novel Software Technology, Nanjing University, 210093, Nanjing, China
Penghui Yao (pyao@nju.edu.cn)
Lijian Zhang (lijian.zhang@nju.edu.cn)
Published:30 September 2021,
Published Online:18 August 2021,
Received:19 January 2021,
Revised:22 July 2021,
Accepted:30 July 2021
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Zhang, A. et al. Quantum verification of NP problems with single photons and linear optics. Light: Science & Applications, 10, 1750-1760 (2021).
Zhang, A. et al. Quantum verification of NP problems with single photons and linear optics. Light: Science & Applications, 10, 1750-1760 (2021). DOI: 10.1038/s41377-021-00608-4.
Quantum computing is seeking to realize hardware-optimized algorithms for application-related computational tasks. NP (nondeterministic-polynomial-time) is a complexity class containing many important but intractable problems like the satisfiability of potentially conflict constraints (SAT). According to the well-founded exponential time hypothesis
verifying an SAT instance of size
n
requires generally the complete solution in an
O
(
n
)-bit proof. In contrast
quantum verification algorithms
which encode the solution into quantum bits rather than classical bit strings
can perform the verification task with quadratically reduced information about the solution in
$$\tilde O(\sqrt n)$$
qubits. Here we realize the quantum verification machine of SAT with single photons and linear optics. By using tunable optical setups
we efficiently verify satisfiable and unsatisfiable SAT instances and achieve a clear completeness-soundness gap even in the presence of experimental imperfections. The protocol requires only unentangled photons
linear operations on multiple modes and at most two-photon joint measurements. These features make the protocol suitable for photonic realization and scalable to large problem sizes with the advances in high-dimensional quantum information manipulation and large scale linear-optical systems. Our results open an essentially new route toward quantum advantages and extend the computational capability of optical quantum computing.
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