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Yingcheng Chen - One of the best experts on this subject based on the ideXlab platform.

  • low light level cross phase Modulation with double slow light pulses
    Physical Review Letters, 2011
    Co-Authors: Borwen Shiau, Mengchang Wu, Yingcheng Chen
    Abstract:

    We report on the first experimental demonstration of low-light-level Cross-Phase Modulation (XPM) with double slow light pulses based on the double electromagnetically induced transparency (EIT) in cold cesium atoms. The double EIT is implemented with two control fields and two weak fields that drive populations prepared in the two doubly spin-polarized states. Group velocity matching can be obtained by tuning the intensity of either of the control fields. The XPM is based on the asymmetric M-type five-level system formed by the two sets of EIT. Enhancement in the XPM by group velocity matching is observed. Our work advances studies of low-light-level nonlinear optics based on double slow light pulses.

  • low light level cross phase Modulation with double slow light pulses
    Physical Review Letters, 2011
    Co-Authors: Borwen Shiau, Mengchang Wu, Yingcheng Chen
    Abstract:

    We report on the first experimental demonstration of low-light-level Cross-Phase Modulation (XPM) with double slow light pulses based on the double electromagnetically induced transparency (EIT) in cold cesium atoms. The double EIT is implemented with two control fields and two weak fields that drive populations prepared in the two doubly spin-polarized states. Group velocity matching can be obtained by tuning the intensity of either of the control fields. The XPM is based on the asymmetric M-type five-level system formed by the two sets of EIT. Enhancement in the XPM by group velocity matching is observed. Our work advances studies of low-light-level nonlinear optics based on double slow light pulses.

Borwen Shiau - One of the best experts on this subject based on the ideXlab platform.

  • low light level cross phase Modulation with double slow light pulses
    Physical Review Letters, 2011
    Co-Authors: Borwen Shiau, Mengchang Wu, Yingcheng Chen
    Abstract:

    We report on the first experimental demonstration of low-light-level Cross-Phase Modulation (XPM) with double slow light pulses based on the double electromagnetically induced transparency (EIT) in cold cesium atoms. The double EIT is implemented with two control fields and two weak fields that drive populations prepared in the two doubly spin-polarized states. Group velocity matching can be obtained by tuning the intensity of either of the control fields. The XPM is based on the asymmetric M-type five-level system formed by the two sets of EIT. Enhancement in the XPM by group velocity matching is observed. Our work advances studies of low-light-level nonlinear optics based on double slow light pulses.

  • low light level cross phase Modulation with double slow light pulses
    Physical Review Letters, 2011
    Co-Authors: Borwen Shiau, Mengchang Wu, Yingcheng Chen
    Abstract:

    We report on the first experimental demonstration of low-light-level Cross-Phase Modulation (XPM) with double slow light pulses based on the double electromagnetically induced transparency (EIT) in cold cesium atoms. The double EIT is implemented with two control fields and two weak fields that drive populations prepared in the two doubly spin-polarized states. Group velocity matching can be obtained by tuning the intensity of either of the control fields. The XPM is based on the asymmetric M-type five-level system formed by the two sets of EIT. Enhancement in the XPM by group velocity matching is observed. Our work advances studies of low-light-level nonlinear optics based on double slow light pulses.

Govind P. Agrawal - One of the best experts on this subject based on the ideXlab platform.

  • vector theory of cross phase Modulation role of nonlinear polarization rotation
    IEEE Journal of Quantum Electronics, 2004
    Co-Authors: Qiang Lin, Govind P. Agrawal
    Abstract:

    We develop a vector theory of Cross-Phase Modulation (XPM) capable of describing nonlinear coupling between two pulses of different wavelengths and arbitrary states of polarization. We focus for simplicity on the pump-probe configuration and use it to investigate the temporal and spectral polarization effects occurring inside an optical fiber. Using the Stokes-vector formalism we show that the probe polarization changes in general through XPM-induced nonlinear polarization rotation. In the absence of dispersion-induced probe broadening, such nonlinear changes in the probe polarization do not affect the temporal shape of the probe pulse but produce a multipeak spectrum whose different spectral peaks have different states of polarization. When dispersive effects are included, even the shape of the probe pulse becomes polarization dependent, and different parts of the pulse develop different states of polarization. Such nonlinear polarization effects lead to novel phenomena such as polarization-dependent compression and splitting of the probe pulse.

  • effects of polarization mode dispersion on cross phase Modulation in dispersion managed wavelength division multiplexed systems
    Journal of Lightwave Technology, 2004
    Co-Authors: Govind P. Agrawal
    Abstract:

    This paper develops a vector theory of Cross-Phase Modulation (XPM) in optical fibers and use it to investigate the impact of polarization-mode dispersion (PMD) on the crosstalk induced by XPM in wavelength-division multiplexed lightwave systems. Under certain reasonable approximations, the theory permits us to obtain an analytic expression for the amplitude of probe fluctuations induced by a copropagating pump channel through XPM. We use this expression to calculate the average level of XPM-induced crosstalk together with its variance for several dispersion maps. We show that PMD not only reduces the crosstalk on average, but also impacts the efficiency of a commonly used polarization-interleaving technique.

  • Impact of fiber birefringence on optical switching with nonlinear optical loop mirrors
    IEEE Journal of Selected Topics in Quantum Electronics, 2004
    Co-Authors: Qiang Lin, Govind P. Agrawal
    Abstract:

    We use a vector theory of Cross-Phase Modulation to discuss how residual birefringence of the fiber loop affects the switching performance of a nonlinear optical loop mirror. It is found that the interaction between polarization-mode dispersion (PMD) and Cross-Phase Modulation transfers spatial randomness of residual birefringence to temporal power fluctuations within the switching window. PMD reduces the switching contrast and the reduction depends on wavelength separation between the signal and control pulses as well as on the magnitude of the PMD parameter. Fluctuations in the switched power become worse for a wavelength separation for which the PMD diffusion length associated with birefringence fluctuations becomes comparable to the nonlinear length associated with Cross-Phase Modulation.

Mengchang Wu - One of the best experts on this subject based on the ideXlab platform.

  • low light level cross phase Modulation with double slow light pulses
    Physical Review Letters, 2011
    Co-Authors: Borwen Shiau, Mengchang Wu, Yingcheng Chen
    Abstract:

    We report on the first experimental demonstration of low-light-level Cross-Phase Modulation (XPM) with double slow light pulses based on the double electromagnetically induced transparency (EIT) in cold cesium atoms. The double EIT is implemented with two control fields and two weak fields that drive populations prepared in the two doubly spin-polarized states. Group velocity matching can be obtained by tuning the intensity of either of the control fields. The XPM is based on the asymmetric M-type five-level system formed by the two sets of EIT. Enhancement in the XPM by group velocity matching is observed. Our work advances studies of low-light-level nonlinear optics based on double slow light pulses.

  • low light level cross phase Modulation with double slow light pulses
    Physical Review Letters, 2011
    Co-Authors: Borwen Shiau, Mengchang Wu, Yingcheng Chen
    Abstract:

    We report on the first experimental demonstration of low-light-level Cross-Phase Modulation (XPM) with double slow light pulses based on the double electromagnetically induced transparency (EIT) in cold cesium atoms. The double EIT is implemented with two control fields and two weak fields that drive populations prepared in the two doubly spin-polarized states. Group velocity matching can be obtained by tuning the intensity of either of the control fields. The XPM is based on the asymmetric M-type five-level system formed by the two sets of EIT. Enhancement in the XPM by group velocity matching is observed. Our work advances studies of low-light-level nonlinear optics based on double slow light pulses.

Ping Koy Lam - One of the best experts on this subject based on the ideXlab platform.

  • Memory-enhanced noiseless Cross-Phase Modulation
    Light: Science & Applications, 2012
    Co-Authors: Mahdi Hosseini, B M Sparkes, J Twamley, Stojan Rebić, Ben C Buchler, Ping Koy Lam
    Abstract:

    Large nonlinearity at the single-photon level can pave the way for the implementation of universal quantum gates. However, realizing large and noiseless nonlinearity at such low light levels has been a great challenge for scientists in the past decade. Here, we propose a scheme that enables substantial nonlinear interaction between two light fields that are both stored in an atomic memory. Semiclassical and quantum simulations demonstrate the feasibility of achieving large Cross-Phase Modulation (XPM) down to the single-photon level. The proposed scheme can be used to implement parity gates from which CNOT gates can be constructed. Furthermore, we present a proof of principle experimental demonstration of XPM between two optical pulses: one stored and one freely propagating through the memory medium. Researchers have developed a new technique that shows promise for constructing optical quantum logic gates. Theoretical simulations performed by Mahdi Hosseini and co-workers from the Australian National University and Macquarie University in Australia show that inducing Cross-Phase Modulation between two single-photon light fields stored in a rubidium atomic memory should provide large phase shifts and thus allow the realization of parity gates and CNOT gates, both of which are needed for quantum computing. The researchers estimate that using cold atoms confined in a dipole trap and short-duration single-photon wavepackets should make it possible to realize phase shifts of the order of 10 mrad — orders of magnitude larger than schemes that employ electromagnetically induced transparency.

  • memory enhanced noiseless cross phase Modulation
    arXiv: Quantum Physics, 2011
    Co-Authors: Mahdi Hosseini, S Rebic, B M Sparkes, J Twamley, Benjamin Buchler, Ping Koy Lam
    Abstract:

    Using a gradient echo memory, we experimentally demonstrate cross phase Modulation (XPM) between two optical pulses; one stored and one freely propagating through the memory medium. We explain how this idea can be extended to enable substantial nonlinear interaction between two single photons that are both stored in the memory. We present semi-classical and quantum simulations along with a proposed experimental scheme to demonstrate the feasibility of achieving large XPM at single photon level.