3,348 research outputs found
Fine Splitting in Charmonium Spectrum with Channel Coupling Effect
We study the fine splitting in charmonium spectrum in quark model with the
channel coupling effect, including , , and ,
, channels. The interaction for channel coupling is
constructed from the current-current Lagrangian related to the color
confinement and the one-gluon exchange potentials. By adopting the massive
gluon propagator from the lattice calculation in the nonperturbative region,
the coupling interaction is further simplified to the four-fermion interaction.
The numerical calculation still prefers the assignment of X(3872).Comment: Submitted to Chinese Physics
Measurement-device-independent QKD with Modified Coherent State
The measurement-device-independent quantum key distribution (MDI-QKD)
protocol has been proposed for the purpose of removing the detector side
channel attacks. Due to the multi-photon events of coherent states sources,
real-life implementations of MDI-QKD protocol must employ decoy states to beat
the photon-number-splitting attack. Decoy states for MDI-QKD based on the weak
coherent states have been studied recently. In this paper, we propose to
perform MDI-QKD protocol with modified coherent states (MCS) sources. We
simulate the performance of MDI-QKD with the decoy states based on MCS sources.
And our simulation indicates that both the secure-key rate and transmission
distance can be improved evidently with MCS sources.The physics behind this
improvement is that the probability of multi-photon events of the MCS is lower
than that of weak coherent states while at the same time the probability of
single-photon is higher
Tunable Goos-H\"{a}nchen shift and polarization beam splitter in electro-optic crystals
We have investigated the tunable lateral shift and polarization beam
splitting of the transmitted light beam through electro-optic crystals, based
on the Pockels effect. The positive and negative lateral shifts could be easily
controlled by adjusting the permittivity tensor, which is modulated by the
external applied electric field. An alternative way to realize the polarization
beam splitter was also proposed by the polarization-dependent lateral shifts.
Numerical simulations for Gaussian-shaped incident beam have demonstrated the
above theoretical results obtained by stationary phase method. All these
phenomena have potential applications in optical devices.Comment: 5 pages, 7 figure
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