Spontaneous parametric down-conversion for an arbitrary monochromatic pump beam

We report an experiment to generate and propagate two entangled spatial qudits, [Formula: see text]-dimensional quantum systems, using spontaneous parametric down-conversion. The manipulation, via pump beam, of the transverse spatial correlation between the photon pairs is explored. Inserting apertures with [Formula: see text]-slits in the arms of the down-converted photons, we associate the qudit space with the [Formula: see text] possible paths followed by each photon. Experimental results for qudits with [Formula: see text] and 8 are shown. We demonstrate that the generated states cannot be classically correlated. We also show the propagation of entangled states of spatial qudits. Their free-space distribution is performed at the laboratory scale and the propagated states maintain a high fidelity with their original form.

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Optimizing focused pump beam characteristics for maximum correlated photon pairs in non-collinear degenerate parametric down conversion

2015 Workshop on Recent Advances in Photonics (WRAP) ◽

10.1109/wrap.2015.7806002 ◽

2015 ◽

Author(s):

Ali Anwar ◽

Nijil Lal ◽

P Chithrabhanu ◽

Gangi Reddy Salla ◽

Ravindra P Singh ◽

...

Keyword(s):

Pump Beam ◽

Photon Pairs ◽

Parametric Down Conversion ◽

Down Conversion ◽

Beam Characteristics

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ANGULAR DISPERSION IN SPONTANEOUS PARAMETRIC DOWN CONVERSION: A TOOL TO GENERATE NARROW TEMPORAL BIPHOTONS AND PURE HERALDED SINGLE PHOTONS

International Journal of Quantum Information ◽

10.1142/s0219749909004906 ◽

2009 ◽

Vol 07 (supp01) ◽

pp. 9-15

Author(s):

ALEJANDRA VALENCIA ◽

MARTIN HENDRYCH ◽

XIAOJUAN SHI ◽

JUAN P. TORRES

Keyword(s):

Fourier Transform ◽

Pump Beam ◽

Single Photons ◽

Angular Dispersion ◽

Joint Spectrum ◽

Full Control ◽

Parametric Down Conversion ◽

Down Conversion

In this paper, we describe how introducing angular dispersion into the pump beam and the downconverted photons in spontaneous parametric downconversion allows us to manipulate the joint spectrum of the paired photons. In particular, when collinear geometries are used, we demonstrate an increase of the photons' bandwidth and discuss the implications of this method for the generation of narrow temporal Fourier transform limited biphotons. Additionally, we describe the situation in which angular dispersion is combined with noncollinear geometries. In this case, a full control of the joint spectrum is achieved and heralded pure single photons with controllable bandwidth can be obtained.

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Quantum imaging of nonlocal spatial correlations in parametric down-conversion induced by the pump-beam profile

2005 Quantum Electronics and Laser Science Conference ◽

10.1109/qels.2005.1548721 ◽

2005 ◽

Author(s):

K.G. Koprulu ◽

G.A. Barbosa ◽

P. Kumar

Keyword(s):

Pump Beam ◽

Beam Profile ◽

Spatial Correlations ◽

Quantum Imaging ◽

Parametric Down Conversion ◽

Down Conversion

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MULTIMODE HONG–OU–MANDEL INTERFEROMETRY

Modern Physics Letters B ◽

10.1142/s0217984905008050 ◽

2005 ◽

Vol 19 (01n02) ◽

pp. 1-19 ◽

Cited By ~ 4

Author(s):

S. P. WALBORN ◽

W. A. T. NOGUEIRA ◽

A. N. de OLIVEIRA ◽

S. PÁDUA ◽

C. H. MONKEN

Keyword(s):

Quantum Information ◽

Pump Beam ◽

Basic Theory ◽

Experimental Results ◽

Two Photon ◽

Photon Pairs ◽

Transverse Profile ◽

Parametric Down Conversion ◽

Pump Signal ◽

Down Conversion

We review some recent experiments based upon multimode two-photon interference of photon pairs created by spontaneous parametric down-conversion. The new element provided by these experiments is the inclusion of the transverse spatial profiles of the pump, signal and idler fields. We discuss multimode Hong–Ou–Mandel interference, and show that the transverse profile of the pump beam can be manipulated in order to control two-photon interference. We present the basic theory and experimental results as well as several applications to the field of quantum information.

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