7,694 research outputs found
Antibunched Emission of Photon-Pairs via Quantum Zeno Blockade
We propose a new methodology, namely "quantum Zeno blockade," for managing
light scattering at a few-photon level in general nonlinear-optical media, such
as crystals, fibers, silicon microrings, and atomic vapors. Using this tool,
antibunched emission of photon pairs can be achieved, leading to potent
quantum-optics applications such as deterministic entanglement generation
without the need for heralding. In a practical implementation using an on-chip
toroidal microcavity immersed in rubidium vapor, we estimate that high-fidelity
entangled photons can be produced on-demand at MHz rates or higher,
corresponding to an improvement of times from the
state-of-the-art.Comment: to appear in Phys. Rev. Let
Interaction-Free All-Optical Switching via Quantum-Zeno Effect
We propose a novel interaction-free scheme for all-optical switching which
does not rely on the physical coupling between signal and control waves. The
interaction-free nature of the scheme allows it to overcome the fundamental
photon-loss limit imposed by the signal-pump coupling. The same phenomenon
protects photonic-signal states from decoherence, making devices based on this
scheme suitable for quantum applications. Focusing on waveguides,
we provide device designs for traveling-wave and Fabry-Perot switches. In both
designs, the performance is optimal when the signal switching is induced by
coherent dynamical evolution. In contrast, when the switching is induced by a
rapid dissipation channel, it is less efficient.Comment: 14 pages, 14 figures, submitted to Physical Review
Hadronic Transition chi(c1)(1P) to eta(c) plus two pions at the Beijing Spectrometer BES and the Cornell CLEO-c
Hadronic transitions of the chi(cj)(1P) states have not been studied yet. We
calculate the rate of the hadronic transition chi(c1)(1P) to eta(c) plus two
pions in the framework of QCD multipole expansion. We show that this process
can be studied experimentally at the upgraded Beijing Spectrometer BES III and
the Cornell CLEO-c.Comment: 6 pages RevTex4(two-column). Version published in Phys. Rev. D 75,
054019 (2007
Heralding Single Photons Without Spectral Factorability
Recent efforts to produce single photons via heralding have relied on
creating spectrally factorable two-photon states in order to achieve both high
purity and high production rate. Through a careful multimode analysis, we find,
however, that spectral factorability is not necessary. Utilizing single-mode
detection, a similar or better performance can be achieved with non-factorable
states. This conclusion rides on the fact that even when using a broadband
filter, a single-mode measurement can still be realized, as long as the
coherence time of the triggering photons exceeds the measurement window of the
on/off detector.Comment: 7 pages, 5 figure
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