10,951 research outputs found
Photonic crystal nanofiber using an external grating
We implement a photonic crystal nanofiber device by reversibly combining an
optical nanofiber and a nanofabricated grating. Using the finite-difference
time-domain method, we design the system for minimal optical loss while
tailoring the resonant wavelength and bandwidth of the device. Experimentally
we demonstrate that the combined system shows a strong photonic stop-band in
good agreement with numerical predictions. The resulting device may be used to
realize strong light-matter coupling near to the nanofiber surface
Thermal photon to dilepton ratio in ultra-relativistic heavy ion collisions
The ratio of transverse momentum distribution of thermal photons to dilepton
has been evaluated. It is observed that this ratio reaches a plateau beyond a
certain value of transverse momentum. We argue that this ratio can be used to
estimate the initial temperature of the system by selecting the transverse
momentum and invariance mass windows judiciously. It is demonstrated that if
the radial flow is large then the plateau disappear and hence a deviation from
the plateau can be used as an indicator of large radial flow. The sensitivity
of the results on various input parameters has been studied.Comment: 9 pages with 11 eps figure
Magnetic field-tuned Aharonov-Bohm oscillations and evidence for non-Abelian anyons at v=5/2
We show that the resistance of the v=5/2 quantum Hall state, confined to an
interferometer, oscillates with magnetic field consistent with an Ising-type
non-Abelian state. In three quantum Hall interferometers of different sizes,
resistance oscillations at v=7/3 and integer filling factors have the magnetic
field period expected if the number of quasiparticles contained within the
interferometer changes so as to keep the area and the total charge within the
interferometer constant. Under these conditions, an Abelian state such as the
(3,3,1) state would show oscillations with the same period as at an integer
quantum Hall state. However, in an Ising-type non-Abelian state there would be
a rapid oscillation associated with the "even-odd effect" and a slower one
associated with the accumulated Abelian phase due to both the Aharonov-Bohm
effect and the Abelian part of the quasiparticle braiding statistics. Our
measurements at v=5/2 are consistent with the latter.Comment: 10 pages, 8 figures, includes Supplemental Material
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R-PEKS: RBAC Enabled PEKS for Secure Access of Cloud Data
In the recent past, few works have been done by combining attribute-based access control with multi-user PEKS, i.e., public key encryption with keyword search. Such attribute enabled searchable encryption is most suitable for applications where the changing of privileges is done once in a while. However, to date, no efficient and secure scheme is available in the literature that is suitable for these applications where changing privileges are done frequently. In this paper our contributions are twofold. Firstly, we propose a new PEKS scheme for string search, which, unlike the previous constructions, is free from bi-linear mapping and is efficient by 97% compared to PEKS for string search proposed by Ray et.al in TrustCom 2017. Secondly, we introduce role based access control (RBAC) to multi-user PEKS, where an arbitrary group of users can search and access the encrypted files depending upon roles. We termed this integrated scheme as R-PEKS. The efficiency of R-PEKS over the PEKS scheme is up to 90%. We provide formal security proofs for the different components of R-PEKS and validate these schemes using a commercial dataset
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