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ABSTRACT: A broadband source of polarization entangled photons based on type-II spontaneous parametric down conversion from a chirped PPKTP crystal is presented. With numerical simulation and experimental evaluation, we report a source of broadband polarization entangled states with a bandwidth of approximately 125 nm for use in quantum interferometry. The technique has the potential to become a basis for the development of flexible broadband sources with designed spectral properties.
Optics Letters 06/2012; 37(11):1910-2. · 3.40 Impact Factor
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ABSTRACT: A polarization mode dispersion (PMD) measurement of a commercial telecommunication wavelength selective switch (WSS) using a quantum interferometric technique with polarization-entangled states is presented. Polarization-entangled photons with a broad spectral width covering the telecom band are produced using a chirped periodically poled nonlinear crystal. The first demonstration of a quantum metrology application using an industrial commercial device shows a promising future for practical high-resolution quantum interference.
Optics Express 01/2012; 20(3):2025-33. · 3.59 Impact Factor
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ABSTRACT: The use of quantum correlations between photons to separate measure even- and odd-order components of polarization mode dispersion (PMD) and chromatic dispersion in discrete optical elements is investigated. Two types of apparatus are discussed which use coincidence counting of entangled photon pairs to allow sub-femtosecond resolution for measurement of both PMD and chromatic dispersion. Group delays can be measured with a resolution of order 0.1 fs, whereas attosecond resolution can be achieved for phase delays.
Optics Express 11/2011; 19(23):22820-36. · 3.59 Impact Factor
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ABSTRACT: It is shown that the use of phase conjugation in one arm of a correlated two-photon imaging apparatus allows undistorted ghost imaging through a region with randomly-varying phase shifts. The images are formed from correlated pairs of photons in such a way that turbulence-induced phase shifts gained by the photons during passage through the medium cancel pairwise.
07/2011;
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ABSTRACT: We introduce two new devices, the correlation confocal and twin-photon microscopes. Like the standard two photon confocal microscope, they use spatially-correlated photon pairs to improve lateral resolution, but with the correlation enforced in different manners. Ocis codes: (180.1790) Confocal microscopy; (180.5810) Scanning microscopy; (190.4970) Parametric oscillators and amplifiers.
Lasers and Electro-Optics (CLEO), 2011 Conference on; 06/2011
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ABSTRACT: The use of quantum correlations between photons to measure polarization mode
dispersion (PMD) and chromatic dispersion is investigated. Two types of
apparatus are discussed which use coincidence counting of entangled photon
pairs to allow sub-femtosecond resolution for measurement of both PMD and
chromatic dispersion, as well as separation of even-order and odd-order
chromatic effects in the PMD. Group delays can be measured with a resolution of
order 0.1 fs, whereas attosecond resolution can be achieved for phase delays.
03/2011;
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P. Ben Dixon,
Gregory Howland,
Kam Wai Clifford Chan,
Colin O'Sullivan-Hale,
Brandon Rodenburg,
Nicholas D. Hardy,
Jeffrey H. Shapiro, D. S. Simon,
A. V. Sergienko,
R. W. Boyd,
John C Howell
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ABSTRACT: We investigate the effect of turbulence on quantum ghost imaging. We use
entangled photons and demonstrate that for a novel experimental configuration
the effect of turbulence can be greatly diminished. By decoupling the entangled
photon source from the ghost imaging central image plane, we are able to
dramatically increase the ghost image quality. When imaging a test pattern
through turbulence, this method increased the imaged pattern visibility from V
= 0.14 +/- 0.04 to V = 0.29 +/- 0.04.
02/2011;
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ABSTRACT: A recently introduced two-channel confocal microscope with correlated detection promises up to 50% improvement in transverse spatial resolution [Simon, Sergienko, Optics Express 18, 9765 (2010)] via the use of photon correlations. Here we achieve similar results in a different manner, introducing a triple-confocal correlated microscope which exploits the correlations present in optical parametric amplifiers. It is based on tight focusing of pump radiation onto a thin sample positioned in front of a nonlinear crystal, followed by coincidence detection of signal and idler photons, each focused onto a pinhole. This approach offers further resolution enhancement in confocal microscopy.
Optics Express 10/2010; 18(21):22147-57. · 3.59 Impact Factor
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ABSTRACT: We discuss a correlated two-photon imaging apparatus that is capable of producing images that are free of the effects of odd-order aberration introduced by the optical system. We show that both quantum-entangled and classically correlated light sources are capable of producing the desired spatial-aberration cancelation.
08/2010;
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ABSTRACT: A new type of confocal microscope is described which makes use of intensity correlations between spatially correlated beams of light. It is shown that this apparatus leads to significantly improved transverse resolution.
Optics Express 05/2010; 18(10):9765-79. · 3.59 Impact Factor
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ABSTRACT: We show that a recently discussed apparatus for aberration-cancelled interferometry may be modified to perform correlated-photon imaging in the so-called "ghost" imaging configuration. For objects in the vicinity of a particular plane, the images are free of object-induced phase distortions. This apparatus has the distinctive feature that it may be used to superimpose images of two objects in a manner that could lead to useful effects and applications. We show that the apparatus works using either quantum-entangled or classically correlated light sources.
11/2009;
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ABSTRACT: We investigate cancellation of spatial aberrations induced by an object placed in a quantum coincidence interferometer with type-II parametric down conversion as a light source. We analyze in detail the physical mechanism by which the cancellation occurs, and show that the aberration cancels only when the object resides in one particular plane within the apparatus. In addition, we show that for a special case of the apparatus it is possible to produce simultaneous cancellation of both even-order and odd-order aberrations in this plane. Comment: To Appear in Phys. Rev. A. 8 pages, 5 figures
11/2009;
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ABSTRACT: We consider Mach-Zehnder and Hong-Ou-Mandel interferometers with nonclassical states of light as input, and study the effect that dispersion inside the interferometer has on the sensitivity of phase measurements. We study in detail a number of different one- and two-photon input states, including Fock, dual Fock, N00N states, and photon pairs from parametric downconversion. Assuming there is a phase shift $\phi_0$ in one arm of the interferometer, we compute the probabilities of measurement outcomes as a function of $\phi_0$, and then compute the Shannon mutual information between $\phi_0$ and the measurements. This provides a means of quantitatively comparing the utility of various input states for determining the phase in the presence of dispersion. In addition, we consider a simplified model of parametric downconversion for which probabilities can be explicitly computed analytically, and which serves as a limiting case of the more realistic downconversion model. Comment: 12 pages, 14 figures. Submitted to Physical Review A
10/2008;
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Kam Wai Clifford Chan, D S Simon,
A V Sergienko,
Nicholas D Hardy,
Jeffrey H Shapiro,
P Ben Dixon,
Gregory A Howland,
John C Howell,
Joseph H Eberly,
Malcolm N O'Sullivan,
Brandon Rodenburg,
Robert W Boyd
Physical Review a. 84(4).
