223 research outputs found
The Nonlocal Pancharatnam Phase in Two-Photon Interferometry
We propose a polarised intensity interferometry experiment, which measures
the nonlocal Pancharatnam phase acquired by a pair of Hanbury Brown-Twiss
photons. The setup involves two polarised thermal sources illuminating two
polarised detectors. Varying the relative polarisation angle of the detectors
introduces a two photon geometric phase. Local measurements at either detector
do not reveal the effects of the phase, which is an optical analog of the
multiparticle Aharonov-Bohm effect. The geometric phase sheds light on the
three slit experiment and suggests ways of tuning entanglement.Comment: v3: final version to appear in Phys. Rev. A (Brief Reports
Atmospheric Neutrinos as a Probe of CPT Violation
We show that atmospheric neutrinos can provide a sensitive and robust probe
of CPT violation (CPTV). We perform realistic event-rate calculations and study
the variations of the ratio of total muon to antimuon survival rates with
and ( baseline length, neutrino energy) in a
detector capable of identifying the muon charge. We demonstrate that
measurements of these ratios when coupled with the significant and
range which characterizes the atmospheric neutrino spectrum provides a method
of both detecting the presence of such violations and putting bounds on them
which compare very favourably with those possible from a future neutrino
factory.Comment: 8 pages, 2 eps figures, modified version to appear in Phys. Lett.
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