82 research outputs found
A pulsed Sagnac source of narrowband polarization-entangled photons
We demonstrate pulsed operation of a bidirectionally pumped polarization
Sagnac interferometric down-conversion source and its generation of narrowband,
high-visibility polarization-entangled photons. Driven by a narrowband,
mode-locked pump at 390.35 nm, the phase-stable Sagnac source with a type-II
phase-matched periodically poled KTiOPO crystal is capable of producing
0.01 entangled pair per pulse in a 0.15-nm bandwidth centered at 780.7 nm with
1 mW of average pump power at a repetition rate of 31.1 MHz. We have achieved a
mean photon-pair generation rate of as high as 0.7 pair per pulse, at which
multi-pair events dominate and significantly reduce the two-photon
quantum-interference visibility. For low generation probability , the
reduced visibility is independent of the throughput efficiency and
of the polarization analysis basis, which can be utilized to yield an accurate
estimate of the generation rate . At low we have characterized
the source entanglement quality in three different ways: average
quantum-interference visibility of 99%, the Clauser-Horne-Shimony-Holt
parameter of , and quantum state tomography with 98.85%
singlet-state fidelity. The narrowband pulsed Sagnac source of entangled
photons is suitable for use in quantum information processing applications such
as free-space quantum key distribution.Comment: 10 pages, 6 figures, accepted for publication in Phys. Rev.
Two-photon coincident-frequency-entanglement via extended phase matching
We demonstrate a new class of frequency-entangled states generated via
spontaneous parametric down-conversion under extended phase matching
conditions. Biphoton entanglement with coincident signal and idler frequencies
is observed over a broad bandwidth in periodically poled KTiOPO. We
demonstrate high visibility in Hong-Ou-Mandel interferometric measurements
under pulsed pumping without spectral filtering, which indicates excellent
frequency indistinguishability between the down-converted photons. The
coincident-frequency entanglement source is useful for quantum information
processing and quantum measurement applications.Comment: 4 pages, 3 figures, submitted to PR
Joint Temporal Density Measurements for Two-Photon State Characterization
We demonstrate a new technique for characterizing two-photon quantum states
based on joint temporal correlation measurements using time resolved single
photon detection by femtosecond upconversion. We measure for the first time the
joint temporal density of a two-photon entangled state, showing clearly the
time anti-correlation of the coincident-frequency entangled photon pair
generated by ultrafast spontaneous parametric down-conversion under extended
phase-matching conditions. The new technique enables us to manipulate the
frequency entanglement by varying the down-conversion pump bandwidth to produce
a nearly unentangled two-photon state that is expected to yield a heralded
single-photon state with a purity of 0.88. The time-domain correlation
technique complements existing frequency-domain measurement methods for a more
complete characterization of photonic entanglement in quantum information
processing.Comment: 4 pages, 5 figure
Engineered optical nonlinearity for a quantum light source
Single-photon pairs created in the nonlinear process of spontaneous
parametric downconversion form the backbone of fundamental and applied
experimental quantum information science. Many applications benefit from
careful spectral shaping of the single-photon wave-packets. In this paper we
tailor the joint spectral wave-function of downconverted photons by modulating
the nonlinearity of a poled crystal without affecting the phase-matching
conditions. We designed a crystal with a Gaussian nonlinearity profile and
confirmed successful wave-packet shaping by two-photon interference
experiments. We numerically show how our method can be applied for attaining
one of the currently most important goals of single-photon quantum optics, the
creation of pure single photons without spectral correlations.Comment: 7 pages (4 pages + appendices), 5 figures. Minor formatting changes.
Fixed typos. Some additional reference
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Experimental Implementation of Optical Clockwork without Carrier-Envelope Phase Control
We demonstrate an optical clockwork without camer-envelope phase control using sum-frequency generation between a CW optical parametric oscillator at 3.39 μm and a modelocked Tisapphire laser with dominant spectral peaks at 834 and 670 nm
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Optical Clockwork without Carrier-Envelope Phase Control
We demonstrate optical clockwork without carrier-envelope phase control using sum-frequency generation between a cw optical parametric oscillator at 3.39 μm and a mode-locked Ti:sapphire laser with dominant spectral peaks at 834 nm and 670 nm
Quantum Transduction of Telecommunications-band Single Photons from a Quantum Dot by Frequency Upconversion
The ability to transduce non-classical states of light from one wavelength to
another is a requirement for integrating disparate quantum systems that take
advantage of telecommunications-band photons for optical fiber transmission of
quantum information and near-visible, stationary systems for manipulation and
storage. In addition, transducing a single-photon source at 1.3 {\mu}m to
visible wavelengths for detection would be integral to linear optical quantum
computation due to the challenges of detection in the near-infrared. Recently,
transduction at single-photon power levels has been accomplished through
frequency upconversion, but it has yet to be demonstrated for a true
single-photon source. Here, we transduce the triggered single-photon emission
of a semiconductor quantum dot at 1.3 {\mu}m to 710 nm with a total detection
(internal conversion) efficiency of 21% (75%). We demonstrate that the 710 nm
signal maintains the quantum character of the 1.3 {\mu}m signal, yielding a
photon anti-bunched second-order intensity correlation, g^(2)(t), that shows
the optical field is composed of single photons with g^(2)(0) = 0.165 < 0.5.Comment: 7 pages, 4 figure
Approach to diagnosis and pathological examination in bronchial Dieulafoy disease: a case series
<p>Abstract</p> <p>Background</p> <p>There are limited series concerning Dieulafoy disease of the bronchus. We describe the clinical presentation of a series of 7 patients diagnosed with Dieulafoy disease of the bronchus and provide information about the pathological diagnosis approach.</p> <p>Patients and methods</p> <p>A retrospective review of patients who underwent surgery for massive and unexplained recurrent hemoptysis in a referral center during a 11-year period.</p> <p>Results</p> <p>Seven heavy smoker (49 pack years) patients (5 males) mean aged 54 years experienced a massive hemoptysis (350–1000 ml) unrelated to a known lung disease and frequently recurrent. Bronchial contrast extravasation was observed in 3 patients, combining both CT scan and bronchial arteriography. Efficacy of bronchial artery embolization was achieved in 40% of cases before surgery. Pathological examination demonstrated a minute defect in 3 cases and a large and dysplasic superficial bronchial artery in the submucosa in all cases.</p> <p>Conclusion</p> <p>Dieulafoy disease should be suspected in patients with massive and unexplained episodes of recurrent hemoptysis, in order to avoid hazardous endoscopic biopsies and to alert the pathologist if surgery is performed.</p
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