Chinese researchers teleported information 500 kilometers away from Earth to space by means of “spooky action at a distance” on 16th of August 2016.
“Einstein’s spooky action at a distance is known as entanglement”
Laboratories worldwide are currently teleported. Thanks to the entanglement technique, information can not be intercepted because of A disappears and B appears, information does not transport in motion.
Action at a distance
Chinese researchers see this successful test a big step towards the quantum internet, the new form of internet. Safer and faster.
The Chinese researchers have teleported information to a satellite that spins 500 kilometers above the earth. Their research is published on the scientific website Arxiv.
In the publication, you read how two photons get entangled and send one of the two photons to the satellite while the other one remained on earth.
When they carried out measurements on Earth and space, it appeared that the information was entangled.
The researchers repeated this experiment with millions of photons and hundreds of photons remained entangled.
In theory, you can send entangled particle to the other side of the universe. The problem is that photons can easily interact with the environment and, as a result, lose the entanglement.
Below is a brief explanation of the action at a distance test.
A. The background of Ngari ground station in Tibet
B. The multi-photon-set-up. The 390 nm pulsed laser passes through two closely mounted BiBO crystals and produces two photons pairs through collinear SPDC (the two photons are in the same spatial mode 1’) and non-collinear SPDC (the two photons are separated in the spatial modes 2’ and 3’).
The photon 2’ and 3’ are then superposed on a PBS to disentangle their frequency information from polarization information for the preparation of entangled photons (labeled as 2 and 3) with both high brightness and high fidelity16.
The two photons from collinear SPDC in the spatial mode 1’ are first separated from the pump beam using a dichroic mirror (DM), and then separated by a PBS where the state of the transmitted photon (labeled as 1) is to be teleported whereas the reflected photon serves as a trigger. Photon 1 and 2 are then combined on another PBS for Bell-state measurement. Narrowband filters with 3 nm and 8 nm are used to erase the frequency correlation of the down-converted photons. The teleported photon 1 is collected by a single-mode fiber and guided to c. To increase the overall four-photon count rate, a second four-photon module (not shown) with the same design and using the same pump laser is prepared and used for multiplexing (see Methods).
C. The transmitting antenna. A faster steering mirror (FSM) and two-axis gimbal mirrors are used for fine and coarse tracking. The DM is used to separate the signal and beacon light. The top right panel illustrates a 671 nm CW laser and 1064 nm pulsed laser with a repetition rate of 10-kHz shooting from the ground to the satellite for APT and time synchronization, respectively. A CMOS camera is used to image the beacon laser from the satellite.
D. The receiver on the satellite. A similar APT system is implemented as the ground station. A polarization analysis consisting of a QWP, a HWP, and a PBS is used, followed by two single-photon detectors.
If they can manage to let the photons wear a horse tack they can not be distracted. If this problem can be eliminated, this can be the future of the new internet. Faster, more reliable, and safer.
— Lions Ground (@lionsground) July 11, 2017
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