Multiphoton Interference in Quantum Fourier Transform Circuits and Applications to Quantum Metrology

Zu-En Su, Yuan Li, Peter P. Rohde, He-Liang Huang, Xi-Lin Wang, Li Li, Nai-Le Liu, Jonathan P. Dowling, Chao-Yang Lu, and Jian-Wei Pan

Phys. Rev. Lett. 119, 080502 – Published 24 August 2017

Abstract

Quantum Fourier transforms (QFTs) have gained increased attention with the rise of quantum walks, boson sampling, and quantum metrology. Here, we present and demonstrate a general technique that simplifies the construction of QFT interferometers using both path and polarization modes. On that basis, we first observe the generalized Hong-Ou-Mandel effect with up to four photons. Furthermore, we directly exploit number-path entanglement generated in these QFT interferometers and demonstrate optical phase supersensitivities deterministically.

Received 28 May 2017

DOI:https://doi.org/10.1103/PhysRevLett.119.080502

Physics Subject Headings (PhySH)

Quantum entanglement Quantum metrology Quantum optics

Quantum Information, Science & Technology

Authors & Affiliations

Zu-En Su^1,2, Yuan Li^1,2, Peter P. Rohde⁴, He-Liang Huang^1,2,3, Xi-Lin Wang^1,2, Li Li^1,2, Nai-Le Liu^1,2, Jonathan P. Dowling⁵, Chao-Yang Lu^1,2, and Jian-Wei Pan^1,2

¹Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
²CAS Centre for Excellence and Synergetic Innovation Centre in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
³Henan Key Laboratory of Quantum Information and Cryptography, Zhengzhou Information Science and Technology Institute, Zhengzhou, Henan 450000, China
⁴Centre for Quantum Software & Information (QSI), Faculty of Engineering & Information Technology, University of Technology Sydney, Sydney, New South Wales 2007, Australia
⁵Hearne Institute for Theoretical Physics and Department of Physics & Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA