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Search Results: 1 - 10 of 51480 matches for " Xian-Min Jin "
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Determination of Zero-Dispersion Wavelength by Four-Wave Mixing
JIN Xiao-Feng,ZHANG Xian-Min,
金晓峰
,章献民

中国物理快报 , 2006,
Abstract: We present an improved approach to determine the zero-dispersion wavelength by measurement of the four-wave mixing (FWM) effect employing the two-tunable-laser scanning method. The FWM behaviour of combined fibres with two different zero-dispersion wavelengths is investigated theoretically and experimentally. The results are compared with those by regular zero-dispersion wavelength test instrument using phase shift technique. The theoretical and experimental results confirm the feasibility of determination of zero-dispersion wavelength by FWM.
Microwave/Millimeter-Wave Generation Using Multi-Wavelength Photonic Crystal Fiber Brillouin Laser
Guo-Feng Shen;Xian-Min Zhang;Hao Chi;Xiao-Feng Jin
PIER , 2008, DOI: 10.2528/PIER07112202
Abstract: An all-optical microwave generation using a multiwavelength photonic crystal fiber Brillouin laser is presented. A highly nonlinear photonic crystal fiber with the length of 25m is used as Brillouin gain medium. A Fabry-Perot cavity with two fiber Bragg gratings as reflectors are designed in order to enhance the Brillouin conversion efficiency. The fiber Bragg gratings can be used to selectively excite the jth-order Stokes' wave and suppress other order Stokes' waves. The mechanism for microwave/millimeterwave generation is theoretically analyzed. In the experiment, both 9.788 GHz and 19.579 GHz microwave signals are achieved through mixing the pump wave with the first-order and the second-order Stokes' waves.
Interference of overlap-free entangled photons with a Mach-Zehnder-like interferometer
Xian-Min Jin,Cheng-Zhi Peng,Tao Yang,Youjin Deng
Physics , 2010,
Abstract: Using spontaneous parametric down conversion and a 50:50 beam splitter, we generate coaxial polarization-entangled photon pairs, of which the two photons are far separated from each other. The photons are then sent one by one through one port of a modified Mach-Zehnder interferometer. We observe interference fringes with a periodicity half of the single-photon wavelength, independent of the distance between the photons. This feature can find applications in quantum-enhanced measurement.
Experimental non-local generation of entanglement from independent sources
Xian-Min Jin,Jügen R?ch,Juan Yin,Tao Yang
Physics , 2010,
Abstract: We experimentally demonstrate a non-local generation of entanglement from two independent photonic sources in an ancilla-free process . Two bosons (photons) are entangled in polarization space by steering into a novel interferometer setup, in which they have never meet each other. The entangled photons are delivered to polarization analyzers in different sites, respectively, and a non-local interaction is observed. Entanglement is further verified by the way of the measured violation of a CHSH type Bell's inequality with S-values of 2.54 and 27 standard deviations. Our results will shine a new light into the understanding on how quantum mechanics works, have possible philosophic consequences on the one hand and provide an essential element for quantum information processing on the other hand. Potential applications of our results are briefly discussed.
Five E+A (post-starburst) galaxies as Brightest Cluster Galaxies
Feng-Shan Liu,Zhong-Lue Wen,Jin-Lin Han,Xian-Min Meng
Physics , 2010,
Abstract: Brightest Cluster Galaxies (BCGs) are mostly elliptical galaxies and very rarely have prominent star formation. We found that five out of 8,812 BCGs are E+A (i.e. post-starburst) galaxies, having the H$\delta$~absorption line with an equivalent width $>2.5\AA$ and no distinct emission lines in [O II] and H$\alpha$. The E+A features we identified from the BCGs for the first time are not as significant as those in general galaxies, indicating that historically the star formation were not very violent.
Experimental Quantum Error-Free Transmission
Xian-Min Jin,Zhen-Huan Yi,Bin Yang,Fei Zhou,Tao Yang,Cheng-Zhi Peng
Physics , 2010,
Abstract: Error-free transmission (EFT) of quantum information is a crucial ingredient in quantum communication network. To overcome the unavoidable decoherence in noisy channel, to date, many efforts have focused on faithfully transmitting one state by consuming large numbers of synchronized ancillary states. However, huge demands of quantum resources are hard to meet with current technology, thus restrict practical applications. Here we propose and demonstrate an economical method of reliably transmitting quantum information. An arbitrary unknown quantum state is converted into time bins deterministically in terms of its own polarization using a modified Franson interferometer. Any arisen noise in channel will induce an associated error to the reference frame of the time bins, which can be utilized to reject errors and recover the initial state. By virtue of state-independent feature, our method can be applied to entanglement distribution. After passing through 0.8 km randomly twisted optical fiber, the entanglement still survives and is verified. Our approach significantly simplifies the implementation of quantum EFT and enables a general quantum state even entanglement to be protected by feedback, thus can be used as a basic building block in practical long-distance quantum communication network.
Quantum enhanced estimation of optical detector efficiencies
Marco Barbieri,Animesh Datta,Tim J. Bartley,Xian-Min Jin,W. Steven Kolthammer,Ian A. Walmsley
Physics , 2015,
Abstract: Quantum mechanics establishes the ultimate limit to the scaling of the precision on any parameter, by iden- tifying optimal probe states and measurements. While this paradigm is, at least in principle, adequate for the metrology of quantum channels involving the estimation of phase and loss parameters, we show that estimat- ing the loss parameters associated with a quantum channel and a realistic quantum detector are fundamentally different. While Fock states are provably optimal for the former, we identify a crossover in the nature of the optimal probe state for estimating detector imperfections as a function of the loss parameter. We provide explicit results for on-off and homodyne detectors, the most widely used detectors in quantum photonics technologies.
Experimental Study on Several Left-Handed Matamaterials
Li-Xin Ran;Jiang Tao Huang-Fu;Hongsheng Chen;Xian-Min Zhang;Kang Sheng Chen;Tomasz M. Grzegorczyk;Jin Au Kong
PIER , 2005, DOI: 10.2528/PIER04040502
Abstract: Left-handed materials (LHM) are engineered structures that exhibit electromagnetic properties not found in nature. Real applications of LHM need substrates with low loss, wide bandwidth as well as stable mechanical characteristics. In this paper, we summarize some experimental as well as numerical results of left-handed materials with different configurations of rods and split-ring resonators (SRRs). Hot-press technics utilized in PC board manufacture are used to produce solid-state multi-layer left-handed materials. Either mechanical or electromagnetic characteristics of LH samples are notably improved.
Magnetic Properties of S-Shaped Split-Ring Resonators
Hongsheng Chen;Li-Xin Ran;Jiang Tao Huang-Fu;Xian-Min Zhang;Kang Sheng Chen;Tomasz M. Grzegorczyk;Jin Au Kong
PIER , 2005, DOI: 10.2528/PIER04051201
Abstract: We present a theoretical analysis of the radiation of an S-shaped split ring resonator (S-SRR) for the realization of a metamaterial exhibiting left-handed properties. It is shown that the structure is resonant due to its internal capacitances and inductances, which can be adjusted such that the electric plasma frequency and magnetic plasma frequency, both due to the S-SRR only, appear within the same frequency band. Using the same idea, we also present some extended S-shaped split-ring resonator structures with improved performance.
Mapping coherence in measurement via full quantum tomography of a hybrid optical detector
Lijian Zhang,Hendrik Coldenstrodt-Ronge,Animesh Datta,Graciana Puentes,Jeff S. Lundeen,Xian-Min Jin,Brian J. Smith,Martin B. Plenio,Ian A. Walmsley
Physics , 2012, DOI: 10.1038/nphoton.2012.107
Abstract: Quantum states and measurements exhibit wave-like --- continuous, or particle-like --- discrete, character. Hybrid discrete-continuous photonic systems are key to investigating fundamental quantum phenomena, generating superpositions of macroscopic states, and form essential resources for quantum-enhanced applications, e.g. entanglement distillation and quantum computation, as well as highly efficient optical telecommunications. Realizing the full potential of these hybrid systems requires quantum-optical measurements sensitive to complementary observables such as field quadrature amplitude and photon number. However, a thorough understanding of the practical performance of an optical detector interpolating between these two regions is absent. Here, we report the implementation of full quantum detector tomography, enabling the characterization of the simultaneous wave and photon-number sensitivities of quantum-optical detectors. This yields the largest parametrization to-date in quantum tomography experiments, requiring the development of novel theoretical tools. Our results reveal the role of coherence in quantum measurements and demonstrate the tunability of hybrid quantum-optical detectors.
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