Metalens-array–based high-dimensional and multiphoton quantum source

The development of two-dimensional metasurfaces has shown great potential in quantum-optical technologies because of the excellent flexibility in light-field manipulation. By integrating a metalens array with a nonlinear crystal, we demonstrate a 100-path spontaneous parametric down-conversion photon-pair source in a 10 × 10 array, which shows promise for high-dimensional entanglement and multiphoton-state generation. We demonstrate two-, three- and four-dimensional two-photon path entanglement with different phases encoded by metalenses with fidelities of 98.4, 96.6, and 95.0%, respectively. Furthermore, four-photon and six-photon generation is observed with high indistinguishability of photons generated from different metalenses. Our metalens-array–based quantum photon source is compact, stable, and controllable, indicating a new platform for integrated quantum devices.

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The biaxial nonlinear crystal BiB3O6 as a polarization entangled photon source using non-collinear type-II parametric down-conversion

Research in Optical Sciences ◽

10.1364/qim.2012.qt5a.1 ◽

2012 ◽

Author(s):

A. Halevy ◽

E. Megidish ◽

L. Dovrat ◽

H. S. Eisenberg ◽

P. Becker ◽

...

Keyword(s):

Nonlinear Crystal ◽

Type Ii ◽

Parametric Down Conversion ◽

Down Conversion ◽

Photon Source

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

Modern Physics Letters B ◽

10.1142/s0217984906009566 ◽

2006 ◽

Vol 20 (01) ◽

pp. 1-23 ◽

Cited By ~ 11

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.

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The biaxial nonlinear crystal BiB_3O_6 as a polarization entangled photon source using non-collinear type-II parametric down-conversion

Optics Express ◽

10.1364/oe.19.020420 ◽

2011 ◽

Vol 19 (21) ◽

pp. 20420 ◽

Cited By ~ 18

Author(s):

A. Halevy ◽

E. Megidish ◽

L. Dovrat ◽

H.S. Eisenberg ◽

P. Becker ◽

...

Keyword(s):

Nonlinear Crystal ◽

Type Ii ◽

Parametric Down Conversion ◽

Down Conversion ◽

Photon Source

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Creating high-dimensional time-bin entanglement using mode-locked lasers

Quantum Information and Computation ◽

10.26421/qic2.6-1 ◽

2002 ◽

Vol 2 (6) ◽

pp. 425-433

Author(s):

H. de Riedmatten ◽

I. Marcikic ◽

H. Zbinden ◽

N. Gisin

Keyword(s):

High Dimensional ◽

Photon State ◽

Two Photon ◽

Length Difference ◽

Fabry Perot ◽

Parametric Down Conversion ◽

Path Length Difference ◽

Mode Locked Lasers ◽

Down Conversion ◽

Feasible Experiment

We present a new scheme to generate high dimensional entanglement between two photonic systems. The idea is based on parametric down conversion with a sequence of pump pulses generated by a mode-locked laser. We prove experimentally the feasibility of this scheme by performing a Franson-type Bell test using a 2-way interferometer with path-length difference equal to the distance between 2 pump pulses. With this experiment, we can demonstrate entanglement for a two-photon state of at least dimension D=11. Finally, we propose a feasible experiment to show a Fabry-Perot like effect for a high dimensional two-photon state.

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Generation of Pure State Photon Triplets in the C-Band

Micromachines ◽

10.3390/mi10110775 ◽

2019 ◽

Vol 10 (11) ◽

pp. 775 ◽

Cited By ~ 1

Author(s):

Xi-Rong Su ◽

Yi-Wen Huang ◽

Tong Xiang ◽

Yuan-Hua Li ◽

Xian-Feng Chen

Keyword(s):

Pure State ◽

Schmidt Number ◽

Second Order ◽

Conversion Process ◽

Gaussian Filter ◽

Periodically Poled ◽

Two Photon ◽

Parametric Down Conversion ◽

Photon States ◽

Down Conversion

In this work, the cascaded second-order spontaneous parametric down-conversion (SPDC) is considered to produce pure state photon triplets in periodically poled lithium niobite (PPLN) doped with 5% MgO. A set of parameters are optimized through calculating the Schmidt number of two-photon states generated by each down-conversion process with different pump durations and crystal lengths. We use a Gaussian filter in part and obtain three photons with 100% purity in spectrum. We provide a feasible and unprecedented scheme to manipulate the spectrum purity of photon triplets in the communication band (C-band).

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