Journal
NATURE COMMUNICATIONS
Volume 5, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms5213
Keywords
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Categories
Funding
- UK EPSRC
- ERC
- QUANTIP
- PHORBITECH
- QESSENCE
- Nokia
- NSQI
- Templeton Foundation
- EU DIQIP
- Royal Academy of Engineering Research Fellowship
- ARC Discovery Early Career Researcher Award [DE140101700]
- DOE Computational Science Graduate Fellowship [DE-FG02-97ER25308]
- National Basic Research Program of China [2011CBA00300, 2011CBA00301]
- National Natural Science Foundation of China [61033001, 61361136003]
- Youth 1000-talent program
- NSF award [PHY-0955518]
- AFOSR award [FA9550-12-1-0046]
- NSF CCI award [CHE-1037992]
- Air Force Office of Scientific Research award [FA9550-12-1-0046]
- Camille and Henry Dreyfus foundation
- Alfred P. Sloan Foundation
- Royal Society Wolfson Merit Award
- EPSRC [EP/L024020/1, EP/J017175/1, EP/K021931/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/K021931/1, EP/L024020/1, EP/J017175/1] Funding Source: researchfish
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Quantum computers promise to efficiently solve important problems that are intractable on a conventional computer. For quantum systems, where the physical dimension grows exponentially, finding the eigenvalues of certain operators is one such intractable problem and remains a fundamental challenge. The quantum phase estimation algorithm efficiently finds the eigenvalue of a given eigenvector but requires fully coherent evolution. Here we present an alternative approach that greatly reduces the requirements for coherent evolution and combine this method with a new approach to state preparation based on ansatze and classical optimization. We implement the algorithm by combining a highly reconfigurable photonic quantum processor with a conventional computer. We experimentally demonstrate the feasibility of this approach with an example from quantum chemistry-calculating the ground-state molecular energy for He-H+. The proposed approach drastically reduces the coherence time requirements, enhancing the potential of quantum resources available today and in the near future.
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