Chinese Academy of Sciences

Xianping Sun

Xin Zhou

Maili Liu

Chaohui Ye

Jun Luo

Lei Shi

Yeqing Han

Xiuchao Zhao

Mingsheng Zhan

An optical-fiber atomic light-filtering apparatus comprising an optical-fiber coupling focusing collimating mirror, a first polarizing optical fiber, a first permanent magnetic ring, a pure iron frame shaped like the Chinese character '', a heat preservation box, a first capillary atomic cell, an armored twisted-pair heating wire, a second permanent magnetic ring, a second polarizing optical fiber, a thermostat, a cable, a third permanent magnetic ring, a temperature sensor, a second capillary atomic cell, a fourth permanent magnetic ring, a third polarizing optical fiber and a photoelectric detector. The two pairs of permanent magnetic rings are matched with the pure iron frame shaped like the Chinese character '' to provide magnetic fields for the two capillary atomic cells working in the same temperature environment; a polarizing plane changes after interaction between a weak signal light and atoms.

Optical-fiber atomic light-filtering apparatus

An inert gas nucleus channel device comprising a magnetic resonance control system, a radio frequency generator, an RF amplifier and AD converter, a frequency synthesizer, a first mixer, a second power amplifier, a second T/R switch, an inert gas nucleus coil, a second pre-amplifier and a second mixer. A magnetic resonance imaging method is also disclosed. The method controls an increase or decrease in a frequency of a pulse or echo signal excited by a radio-frequency signal, implementing magnetic resonance imaging using hyperpolarized inert gases (such as xenon, helium, and krypton), making it possible to apply MRI to lungs and brains using the hyperpolarized inert gases, and expanding the probing range of MRI. The inert gas nucleus channel device is simple in structure and easy to operate and upgrades a hydrogen nucleus magnetic resonance imaging instrument to become a multi-nuclei MRI system using the hyperpolarized inert gases.

Device having inert gas nucleus channel and method for magnetic resonance imaging using the same

The present invention discloses a free-space quantum communication device with atomic filters which are used in the field of quantum cryptography. The free-space quantum communication device of the present invention includes a beam splitter (), two &#x3bb;/2 wave plates (), a &#x3bb;/4 wave plate (), two polarization beam splitters (), two atomic filters (), two light couplers (), two optical fibers () and two single-photon detectors (). In the present invention, the interference filter used in the conventional quantum communication device is replaced by ultra-narrow line-width atomic filters. As the pass-band width of atomic filter is narrower than that of the interference filter in magnitude order of 3 and a light noise rejection ratio of 10can be obtained, error rate generated by background light noise can be reduced by magnitude order of 2-3. Further, the distance for carrying out free-space quantum communication can be increased. Moreover, the free-space quantum cryptography communication device can normally operate in a good manner under background light noise with sunlight or moonlight.

Free-space quantum communication device with atomic filters

Growing community of inventors

Hubei, China

Xianping Sun