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Realization of a Knill-Laflamme-Milburn controlled-NOT photonic quantum circuit combining effective optical nonlinearities
| Title: | Realization of a Knill-Laflamme-Milburn controlled-NOT photonic quantum circuit combining effective optical nonlinearities |
| Authors: | Okamoto, Ryo Browse this author | | O'Brien, Jeremy L. Browse this author | | Hofmann, Holger F. Browse this author | | Takeuchi, Shigeki Browse this author →KAKEN DB |
| Keywords: | nonlinear optics | | quantum optics | | linear optics | | quantum gates |
| Issue Date: | 21-Jun-2011 |
| Publisher: | National Academy of Sciences |
| Journal Title: | Proceedings of the National Academy of Sciences of the United States of America |
| Volume: | 108 |
| Issue: | 25 |
| Start Page: | 10067 |
| End Page: | 10071 |
| Publisher DOI: | 10.1073/pnas.1018839108 |
| Abstract: | Quantum information science addresses how uniquely quantum mechanical phenomena such as superposition and entanglement can enhance communication, information processing, and precision measurement. Photons are appealing for their low noise, light-speed transmission and ease of manipulation using conventional optical components. However, the lack of highly efficient optical Kerr nonlinearities at single photon level was a major obstacle. In a breakthrough, Knill, Laflamme, and Milburn (KLM) showed that such an efficient nonlinearity can be achieved using only linear optical elements, auxiliary photons, and measurement [(2001) Nature 409:46-52]. KLM proposed a heralded controlled-NOT (CNOT) gate for scalable quantum computation using a photonic quantum circuit to combine two such nonlinear elements. Here we experimentally demonstrate a KLM CNOT gate. We developed a stable architecture to realize the required four-photon network of nested multiple interferometers based on a displaced-Sagnac interferometer and several partially polarizing beamsplitters. This result confirms the first step in the original KLM 'recipe' for all-optical quantum computation, and should be useful for on-demand entanglement generation and purification. Optical quantum circuits combining giant optical nonlinearities may find wide applications in quantum information processing, communication, and sensing. |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/47771 |
| Appears in Collections: | 電子科学研究所 (Research Institute for Electronic Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 竹内 繁樹
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