Multi-photon entangled states from two-crystal geometry parametric down-conversion and their application in quantum teleportation

2005 ◽  
Vol 244 (1-6) ◽  
pp. 285-289 ◽  
Author(s):  
Yongmin Li ◽  
Takayoshi Kobayashi
Keyword(s):  
Quantum Teleportation ◽  
Entangled States ◽  
Parametric Down Conversion ◽  
Down Conversion

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 Pump Spectral Bandwidth, Birefringence, and Entanglement in Type-II Parametric Down Conversion

2009 ◽  
Vol 2009 ◽  
pp. 1-5
Author(s):  
Daniel Erenso
Keyword(s):  
Quantum Teleportation ◽  
Spectral Composition ◽  
Spectral Width ◽  
Degree Of Polarization ◽  
Type Ii ◽  
Spectral Bandwidth ◽  
Potential Source ◽  
Parametric Down Conversion ◽  
Down Conversion ◽  
Exact Numerical Calculation

The twin photons produced by a type-II spontaneous parametric down conversion are well know as a potential source of photons for quantum teleportation due to the strong entanglement in polarization. This strong entanglement in polarization, however, depends on the spectral composition of the pump photon and the nature of optical isotropy of the crystal. By exact numerical calculation of the concurrence, we have shown that how pump photons spectral width and the birefringence nature of the crystal directly affect the degree of polarization entanglement of the twin photons.

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