A Kind of Three-Mode Entangled States of Continuum Variables Generated by Beam Splitter and Parametric Down-Conversion Amplifier

2005 ◽  
Vol 43 (2) ◽  
pp. 208-212 ◽  
Author(s):  
Jiang Nian-Quan ◽  
Fan Hong-Yi
Keyword(s):  
Beam Splitter ◽  
Entangled States ◽  
Parametric Down Conversion ◽  
Down Conversion

scholarly journals Partial Bell-State Analysis with Parametric down Conversion in the Wigner Function Formalism

2010 ◽  
Vol 2010 ◽  
pp. 1-11 ◽  
Author(s):  
A. Casado ◽  
S. Guerra ◽  
J. Plácido
Keyword(s):  
Wigner Function ◽  
Beam Splitter ◽  
Bell State ◽  
Function Formalism ◽  
State Measurement ◽  
Parametric Down Conversion ◽  
Correlation Properties ◽  
Light Beams ◽  
Down Conversion ◽  
State Analysis

We apply the Wigner function formalism to partial Bell-state analysis using polarization entanglement produced in parametric down conversion. Two-photon statistics at a beam-splitter are reproduced by a wave-like description with zeropoint fluctuations of the electromagnetic field. In particular, the fermionic behaviour of two photons in the singlet state is explained from the invariance on the correlation properties of two light beams going through a balanced beam-splitter. Moreover, we show that a Bell-state measurement introduces some fundamental noise at the idle channels of the analyzers. As a consequence, the consideration of more independent sets of vacuum modes entering the crystal appears as a need for a complete Bell-state analysis.

TWO-PHOTON HIGH-DIMENSIONAL SPATIAL ENTANGLEMENT: THEORY AND EXPERIMENT

2006 ◽  
Vol 20 (01) ◽  
pp. 1-23 ◽  
Author(s):  
LEONARDO NEVES ◽  
G. LIMA ◽  
J. G. AGUIRRE GÓMEZ ◽  
C. H. MONKEN ◽  
C. SAAVEDRA ◽  
...  
Keyword(s):  
Quantum Systems ◽  
High Dimensional ◽  
Entangled States ◽  
Type Ii ◽  
Opaque Screen ◽  
Two Photon ◽  
Parametric Down Conversion ◽  
Experimental Works ◽  
Maximally Entangled States ◽  
Down Conversion

We review recent theoretical and experimental works where are proposed and demonstrated how to use photon pairs created by spontaneous parametric down-conversion to generate entangled states of D-dimensional quantum systems, or qudits. This is the first demonstration of high-dimensional entanglement based on the intrinsic transverse momentum entanglement of the type-II down-converted photons. The qudit space is defined by an aperture made up of an opaque screen with D slits (paths), placed in the arms of the twin photons. By manipulating the pump beam profile we can prepare different entangled states of these possible paths. We focus our attention on an important case for applications in quantum information: the maximally entangled states. Experimental results for qudits with D=4 and D=8 are shown and measuring a two-photon conditional interference, we also demonstrate the nonclassical character of the correlations.

Stimulated parametric down conversion and generation of four-path polarization-entangled states

2004 ◽  
Vol 232 (1-6) ◽  
pp. 357-369 ◽  
Author(s):  
Sergey A. Podoshvedov ◽  
Jaewoo Noh ◽  
Kisik Kim
Keyword(s):  
Entangled States ◽  
Parametric Down Conversion ◽  
Down Conversion

GENERATING AND DISTRIBUTING TWO-PHOTON ENTANGLED SPATIAL QUDITS

2007 ◽  
Vol 05 (01n02) ◽  
pp. 69-81 ◽  
Author(s):  
G. LIMA ◽  
LEONARDO NEVES ◽  
IVAN F. SANTOS ◽  
C. H. MONKEN ◽  
J. G. AGUIRRE GÓMEZ ◽  
...  
Keyword(s):  
Free Space ◽  
Pump Beam ◽  
Quantum Systems ◽  
Space Distribution ◽  
Entangled States ◽  
Original Form ◽  
High Fidelity ◽  
Two Photon ◽  
Parametric Down Conversion ◽  
Down Conversion

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.

scholarly journals Two independent photon pairs versus four-photon entangled states in parametric down conversion

2004 ◽  
Vol 51 (11) ◽  
pp. 1637-1649 ◽  
Author(s):  
Hugues De Riedmatten ◽  
Valerio Scarani ◽  
Ivan Marcikic ◽  
Antonio Acín ◽  
Wolfgang Tittel ◽  
...  
Keyword(s):  
Entangled States ◽  
Photon Pairs ◽  
Parametric Down Conversion ◽  
Down Conversion

scholarly journals Counting of Hong-Ou-Mandel Bunched Optical Photons Using a Fast Pixel Camera

Sensors ◽  
2020 ◽  
Vol 20 (12) ◽  
pp. 3475
Author(s):  
Andrei Nomerotski ◽  
Michael Keach ◽  
Paul Stankus ◽  
Peter Svihra ◽  
Stephen Vintskevich
Keyword(s):  
Spatial Resolution ◽  
Time Resolution ◽  
Interference Effect ◽  
Beam Splitter ◽  
Good Time ◽  
Spatial Mode ◽  
Parametric Down Conversion ◽  
Optical Photons ◽  
Down Conversion ◽  
Good Time Resolution

The uses of a silicon-pixel camera with very good time resolution (∼nanosecond) for detecting multiple, bunched optical photons is explored. We present characteristics of the camera and describe experiments proving its counting capabilities. We use a spontaneous parametric down-conversion source to generate correlated photon pairs, and exploit the Hong-Ou-Mandel (HOM) interference effect in a fiber-coupled beam splitter to bunch the pair onto the same output fiber. It is shown that the time and spatial resolution of the camera enables independent detection of two photons emerging simultaneously from a single spatial mode.

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