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

Publication Type:
Journal Article
Citation:
Physical Review Letters, 2017, 119 (8)
Issue Date:
2017-08-24
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© 2017 American Physical Society. 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.
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