Photonic integrated multi-photon entangled quantum states and glazing frequency comb research was important progress
takeaway: multiphoton is entangled quantum communication, quantum computation and beyond the classical limit of ultra-high resolution is the cornerstone of sensing and imaging technology, at the same time explore the basic problems of quantum physics has very important application.
on March 11, xi 'an Science magazine published the Chinese Academy of Sciences researcher at the institute of optical precision machinery Brent E. Little in Quebec, Canada and the national institute of science, the university of Sussex, city university of Hong Kong and other units cooperation published titled Generation of multiphoton entangled quantum states by means of integrated frequency combs the research paper. On The same day, Science published titled 'The time is right for multiphoton entangled states - A chip - 基于microresonator允许时间 Bin of entanglement review article, for the film on the multi-photon entangled quantum frequency comb gives introduction and spoke highly of. The work is xi 'an light machine by following the on-chip parallel prediction ( Heraled) Single photon source and on cross polarization entangled photon pairs, quantum optics in photonic integration after another important progress on the research.
multiphoton is entangled quantum communication, quantum computation and beyond the classical limit of ultra-high resolution is the cornerstone of sensing and imaging technology, at the same time explore the basic problems of quantum physics has very important application. Especially large-scale integrated on a chip entangled photons source has become the urgent demand of quantum technology development. 布伦特E。 Little people such as using micro ring resonator in the spontaneous four-wave mixing effect, in the time domain separation, phase adjustable optical pulse for pump sources are used, to get across the S - C - L three band frequency interval of 200 GHZ entangled photon pairs - — The source of entangled photons is by far the widest bandwidth quantum frequency comb, its quantum interference fringe visibility of 93. 2%. Through two different extract on the resonant wavelength and two pairs of photons, get four entangled photons, its quantum interference fringe visibility up to 89%. The study started on a chip and control complex quantum state of the era, and provides a scalable integration of light quantum information processing platform.
布伦特E。 Little more than 20 years of research experience in the field of integrated optics, is an expert in international famous photonic integration, machine are engaged in full-time in 2013 to join xi 'an photonic integration related technical research. He is a micro ring resonator theory and experimental research, one of the early pioneers of its micro - on the ring Speech path under the filter paper has been cited more than 1300 times. Nonlinear effect on piece at the same time also has a lot of, in optical parametric oscillator, mode-locked lasers, multi-channel entangled photons to produce research direction has been more than 10 papers published in Nature Photonics, Nature, Communication and other journals.
at the same time, xi 'an - light machine The micro-nano photonics wen-fu zhang for young scholars of joint research center, deputy director of the latest in the field of photonic integrated piece of glazing frequency comb series also progress. Wen-fu zhang group theory and technology research, after more than three years in a recent international Si3N4 micro ring for the first time realized the visible light frequency comb, namely, within a single integrated micro ring device using four-wave mixing and third-order and frequency effect, at the same time the infrared and green light frequency comb. At the same time stimulate the infrared frequency comb 2/3 octave (wide 1300 - 2100nm) ; Green light frequency comb bandwidth and power are the current world record ( 502 - 580海里,80太赫兹,0。 1mW) , the conversion efficiency for - 35分贝。 Solved due to the strong Rayleigh scattering and strong in micro ring material dispersion cannot, as a result of the problem of optical frequency comb in visible band. At the same time, based on the high Q value (> 2 * 106) Speech path up and down the micro ring resonator ( 添加- 删除过滤器) , implementation is based on optical parametric oscillator ( OPO） Micro ring optical frequency comb, pump power of 50 mw, 50 GHZ frequency interval, bandwidth is greater than 200 nm, produce the high quality of microwave signal. Using double pump self lock clamping laser cavity system, for the first time by using the frequency interval of external cavity control technology to achieve the tuning, produced 300 GHZ, 400 GHZ, THZ 1 and 2. 3 THZ optical frequency comb high repetition frequency stability. Because of its characteristics of miniaturization and high repetition rate is expected to be in the future, astronomical observation, integrated microwave photon source, RF arbitrary wavefront generate, optical communications, miniaturization of optical clocks, and other fields have important applications. Over the past 10 years, the international on Kerr microcavity optical frequency comb research has made a series of major breakthrough, limited by conditions such as technology, our country has no significant progress in that direction.
figure 1 experiment device figure
figure 2 four entangled photons
figure 3 OPO based broadband Kerr optical frequency comb
4 at the same time, the green light and infrared frequency comb produces