Projects per year
Abstract
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.
Original language | English |
---|---|
Article number | 4213 |
Number of pages | 7 |
Journal | Nature Communications |
Volume | 5 |
DOIs | |
Publication status | Published - 23 Jul 2014 |
Research Groups and Themes
- QETLabs
Keywords
- COUPLED-CLUSTER
- COMPUTATION
- SIMULATION
- ALGORITHM
- COMPUTER
- SYSTEMS
Fingerprint
Dive into the research topics of 'A variational eigenvalue solver on a photonic quantum processor'. Together they form a unique fingerprint.Projects
- 6 Finished
-
-
Quantum Optics for Integrated Photonic Technologies
Rarity, J. G. (Principal Investigator)
16/06/14 → 15/06/19
Project: Research
-
Programme Grant: Engineering Photonic Quantum Technologies.
Rarity, J. G. (Principal Investigator), O'Brien, J. L. (Principal Investigator), Thompson, M. G. (Co-Investigator), Erven, C. (Co-Investigator), Sahin, D. (Co-Investigator), Marshall, G. D. (Researcher), Barreto, J. (Co-Investigator), Jiang, P. (Collaborator), McCutcheon, W. D. (Researcher), Silverstone, J. W. (Researcher), Sinclair, G. F. (Researcher), Kling, L. (Engineer), Banerjee, A. (Researcher), Wang, J. (Researcher), Santagati, R. (Researcher), Borghi, M. (Researcher), Woodland, E. M. (Manager), Mawdsley, H. C. M. (Administrator) & Faruque, I. I. (Researcher)
16/06/14 → 15/06/19
Project: Research, Parent