Hong-Ou-Mandel(HOM)interference is one of the most important experimental phenomena in quantum optics.It has drawn considerable attention with respect to quantum cryptography and quantum communication because of the a...Hong-Ou-Mandel(HOM)interference is one of the most important experimental phenomena in quantum optics.It has drawn considerable attention with respect to quantum cryptography and quantum communication because of the advent of the measurement device independent(MDI)quantum key distribution(QKD)protocol.Here,we realize HOM interference,having a visibility of approximately 38.1%,using two independent heralded single-photon sources(HSPSs).The HOM interference between two independent HSPSs is a core technology for realizing the long-distance MDI QKD protocol,the quantum coin-tossing protocol,and other quantum cryptography protocols.展开更多
Recently, the Hong-Ou-Mandel （HOM） interference between two independent weak coherent pulses （WCPs） has been paid much attention due to the measurement-device-independent （MDI） quantum key distribution （QKD）. ...Recently, the Hong-Ou-Mandel （HOM） interference between two independent weak coherent pulses （WCPs） has been paid much attention due to the measurement-device-independent （MDI） quantum key distribution （QKD）. Using classical wave theory, articles reported before show that the visibility of this kind of HOM-type interference is 〈 50%. In this work, we analyze this kind of interference using quantum optics, which reveals more details compared to the wave theory. Analyses confirm the maximum visibility of 50%. And we conclude that the maximum visibility of 50% comes from the two single-photon states in WCPs, without considering the noise. In the experiment, we successfully approach the visibility of 50% by using WCPs splitting from the single pico-second laser source and phase scanning. Since this kind of HOM interference is immune to slow phase fluctuations, both the realized and proposed experiment designs can provide stable ways of high-resolution optical distance detection.展开更多
The second-order interference of two independent photons with different spectra in a Shih-Alley/Hong-Ou-Mandel interferometer is studied in Feynman's path integral theory. There is a second-order interference patt...The second-order interference of two independent photons with different spectra in a Shih-Alley/Hong-Ou-Mandel interferometer is studied in Feynman's path integral theory. There is a second-order interference pattern for photons with different spectra if the photons are indistinguishable for the employed detection system. The conditions to observe the second-order temporal beating with photons of different spectra are analyzed. The influence of the response time of the detection system on the observed second-order interference pattern is also discussed. It is a direct result of that measurement in quantum mechanics is dependent on the employed measuring apparatus. The results are helpful to understand the physics of two-photon interference in different schemes.展开更多
文摘Hong-Ou-Mandel(HOM)interference is one of the most important experimental phenomena in quantum optics.It has drawn considerable attention with respect to quantum cryptography and quantum communication because of the advent of the measurement device independent(MDI)quantum key distribution(QKD)protocol.Here,we realize HOM interference,having a visibility of approximately 38.1%,using two independent heralded single-photon sources(HSPSs).The HOM interference between two independent HSPSs is a core technology for realizing the long-distance MDI QKD protocol,the quantum coin-tossing protocol,and other quantum cryptography protocols.
基金Project supported by the National Basic Research Program of China(Grants Nos.2011CBA00200 and 2011CB921200)the National Natural Science Foundation of China(Grant Nos.61201239,61205118,11304397,and 61475148)the“Strategic Priority Research Program(B)”of the Chinese Academy of Sciences(Grant No.XDB01030100 and XDB01030300)
文摘Recently, the Hong-Ou-Mandel （HOM） interference between two independent weak coherent pulses （WCPs） has been paid much attention due to the measurement-device-independent （MDI） quantum key distribution （QKD）. Using classical wave theory, articles reported before show that the visibility of this kind of HOM-type interference is 〈 50%. In this work, we analyze this kind of interference using quantum optics, which reveals more details compared to the wave theory. Analyses confirm the maximum visibility of 50%. And we conclude that the maximum visibility of 50% comes from the two single-photon states in WCPs, without considering the noise. In the experiment, we successfully approach the visibility of 50% by using WCPs splitting from the single pico-second laser source and phase scanning. Since this kind of HOM interference is immune to slow phase fluctuations, both the realized and proposed experiment designs can provide stable ways of high-resolution optical distance detection.
基金Project supported by the Key Research and Development Project of Shaanxi Province,China(Grant No.2019ZDLGY09-08)the Open Fund of MOE Key Laboratory of Weak-Light Nonlinear Photonics,China(Grant No.OS19-2)the Fundamental Research Funds for the Central Universities,China
文摘The second-order interference of two independent photons with different spectra in a Shih-Alley/Hong-Ou-Mandel interferometer is studied in Feynman's path integral theory. There is a second-order interference pattern for photons with different spectra if the photons are indistinguishable for the employed detection system. The conditions to observe the second-order temporal beating with photons of different spectra are analyzed. The influence of the response time of the detection system on the observed second-order interference pattern is also discussed. It is a direct result of that measurement in quantum mechanics is dependent on the employed measuring apparatus. The results are helpful to understand the physics of two-photon interference in different schemes.
