An experimental setup for midday state interference. PC polarization controller, DL delay line, CF combination filter, CR circulator, NZDSF non-zero dispersion shifted fiber, BF bandpass filter, FM Faraday mirror, P polarizer, BS beam splitter, D superconducting nanowire single Photon detector. Credit: Light: Science and Applications (2024). DOI: 10.1038/s41377-024-01439-9
The scientists introduced a form of quantum entanglement called frequency-domain photon number path entanglement. This advancement in quantum physics involves an innovative tool called a frequency beam splitter, which has the unique ability to change the frequency of a single photon with a success rate of up to 50%.
The scientific community has been studying the entanglement of photons in the spatial domain for many years, and it is a key player in the fields of quantum metrology and information science.
The concept involves photons arranged in a special pattern, the so-called noon state, where they are either all in one path or another, enabling super-resolution imaging, quantum sensors, and beyond traditional limitations. Enhancement and the development of quantum technology and other applications.
In a new paper published in Light: Science and ApplicationsA team of scientists led by Heedeuk Shin, a professor at the Department of Physics at Pohang University of Science and Technology in South Korea, developed an entangled state in the frequency domain, which is a concept similar to the NOON state in the space domain, but with a significant change: the photon is split into two paths , they are distributed between two frequencies.
This advancement resulted in the successful creation of two-photon NOON states within a single-mode fiber, demonstrating the ability to perform two-photon interference at twice the resolution of two-photon interference, demonstrating superior stability and potential for future applications.
Experimental diagram of frequency domain entanglement. Two photons of different colors (red and blue) are injected into an interferometer constructed from two frequency beam splitters. Then, the resulting interference pattern is measured. b, Measured two-photon NOON state interference pattern with a twofold improvement in resolution compared to the single-photon counterpart. c, Measured single-photon state interference pattern. Photo credit: Dongjin Lee, Woncheol Shin, Sebae Park, Junyeop Kim and Heedeuk Shin
“In our research, we changed the concept of interference from occurring between two spatial paths to occurring between two different frequencies. This transformation allows us to transmit two color components through single-mode optical fiber, thereby Creating an unprecedented stable interferometer,” said Dongjin Li, first author of the paper.
This discovery not only enriches our understanding of the quantum world, but also lays the foundation for a new era of frequency domain quantum information processing. The exploration of frequency-domain entanglement heralds advances in quantum technology that could impact everything from quantum sensing to secure communications networks.
More information:
Dongjin Lee et al., Noon state interference in frequency domain, Light: Science and Applications (2024). DOI: 10.1038/s41377-024-01439-9
Provided by Chinese Academy of Sciences
citation: Unveiling a new quantum frontier: frequency domain entanglement (2024, April 26) Retrieved April 26, 2024, from https://phys.org/news/2024-04-unveiling-quantum-frontier-Frequency- domain.html
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