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Multiphoton Interference in Quantum Fourier Transform Circuits and Applications to Quantum Metrology
Zu-En Su1,2, Yuan Li1,2, Peter P Rohde3
1Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.
Physical Review Letters
|September 28, 2017
Summary
Researchers developed a new method for building quantum Fourier transform (QFT) interferometers. This technique enables the observation of quantum effects and deterministic demonstration of optical phase supersensitivities.
Area of Science:
- Quantum Information Science
- Quantum Optics
- Quantum Metrology
Background:
- Quantum Fourier transforms (QFTs) are crucial for quantum algorithms like quantum walks and boson sampling.
- Existing methods for constructing QFT interferometers can be complex.
- The development of simplified QFT interferometer construction is essential for advancing quantum technologies.
Purpose of the Study:
- To present a general and simplified technique for constructing quantum Fourier transform (QFT) interferometers.
- To demonstrate novel quantum phenomena using these simplified interferometers.
- To exploit generated entanglement for advanced quantum sensing applications.
Main Methods:
- Developed a general technique for QFT interferometer construction utilizing path and polarization modes.
- Observed the generalized Hong-Ou-Mandel effect using up to four photons within the constructed interferometers.
- Exploited number-path entanglement generated in the QFT interferometers.
Main Results:
- Successfully demonstrated a simplified method for building QFT interferometers.
- Achieved the first observation of the generalized Hong-Ou-Mandel effect with four photons.
- Deterministically demonstrated optical phase supersensitivities by exploiting number-path entanglement.
Conclusions:
- The presented technique offers a simplified approach to QFT interferometer construction.
- This work opens new avenues for exploring quantum phenomena and entanglement in multi-photon systems.
- The demonstrated optical phase supersensitivities hold promise for enhanced quantum metrology applications.
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