Quantum-polarization state tomography

A ground-based receiving station for quantum key distribution with a satellite, capable of analyzing the quantum polarization states of photons, is demonstrated. In the experiment on tracking a low-Earth orbit satellite, the residual tracking error by the ground station does not exceed 10 μrad, which ensures stable reception of the optical signal in four channels of the polarization state decoder. An estimation of the efficiency of registration of an optical signal in the mode of tracking satellites is carried out.

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On-Chip Adiabatic Couplers for Broadband Quantum-Polarization State Preparation

Conference on Lasers and Electro-Optics ◽

10.1364/cleo_at.2018.jw2a.34 ◽

2018 ◽

Author(s):

Hung-Pin Chung ◽

Kuang-Hsu Huang ◽

Kai Wang ◽

Sung-Lin Yang ◽

Shih-Yuan Yang ◽

...

Keyword(s):

Polarization State ◽

State Preparation ◽

Quantum Polarization ◽

On Chip

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Full-parallax 3D display using time-multiplexing projection technology

Electronic Imaging ◽

10.2352/issn.2470-1173.2020.2.sda-100 ◽

2020 ◽

Vol 2020 (2) ◽

pp. 100-1-100-6

Author(s):

Takuya Omura ◽

Hayato Watanabe ◽

Naoto Okaichi ◽

Hisayuki Sasaki ◽

Masahiro Kawakita

Keyword(s):

Incident Light ◽

Polarization State ◽

3D Image ◽

3D Display ◽

Time Division Multiplexing ◽

3D Images ◽

Polarization Gratings ◽

Light Rays ◽

Time Division

We enhanced the resolution characteristics of a threedimensional (3D) image using time-division multiplexing methods in a full-parallax multi-view 3D display. A time-division light-ray shifting (TDLS) method is proposed that uses two polarization gratings (PGs). As PG changes the diffraction direction of light rays according to the polarization state of the incident light, this method can shift light rays approximately 7 mm in a diagonal direction by switching the polarization state of incident light and adjusting the distance between the PGs. We verified the effect on the characteristics of 3D images based on the extent of the shift. As a result, the resolution of a 3D image with depth is improved by shifting half a pitch of a multi-view image using the TDLS method, and the resolution of the image displayed near the screen is improved by shifting half a pixel of each viewpoint image with a wobbling method. These methods can easily enhance 3D characteristics with a small number of projectors.

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Entanglement

10.1093/oso/9780198714057.003.0003 ◽

2017 ◽

Author(s):

Richard Healey

Keyword(s):

Quantum Theory ◽

Quantum State ◽

Physical Condition ◽

Physical System ◽

Polarization State ◽

Quantum Systems ◽

Ghz State ◽

Mathematical Representation ◽

Entangled State ◽

Physical Relation

Often a pair of quantum systems may be represented mathematically (by a vector) in a way each system alone cannot: the mathematical representation of the pair is said to be non-separable: Schrödinger called this feature of quantum theory entanglement. It would reflect a physical relation between a pair of systems only if a system’s mathematical representation were to describe its physical condition. Einstein and colleagues used an entangled state to argue that its quantum state does not completely describe the physical condition of a system to which it is assigned. A single physical system may be assigned a non-separable quantum state, as may a large number of systems, including electrons, photons, and ions. The GHZ state is an example of an entangled polarization state that may be assigned to three photons.

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