Popular Science

What is Quantum Teleportation?

Quantum teleportation is a way of transferring a quantum state from one place to another without actually sending a particle in that state through space. (Source – Physicsworld.com)

Anton Zeilinger (right) of the University of Vienna has extended this distance to 143 km by teleporting quantum states across the stretch of sea separating two of the Canary Islands. The team claims that its triumph takes the prospect of quantum teleportation to and from satellites one step closer.

Zeilinger and co-workers teleported quantum states from La Palma to Tenerife, and to pull it off they had to develop several new technologies including a new source of entangled photon pairs and “ultra-low-noise” single-photon detectors. Timing also proved to be a challenge, because the 10 ns uncertainty in GPS timing signals was not good enough to achieve the teleportation. Instead, the team had to develop a new “entanglement-assisted clock synchronization” technique that relies on the detection of the entangled photons

What’s the use of Quantum Teleportation?

Read more at

• http://physicsworld.com/cws/article/news/2012/may/21/physicists-claim-new-quantum-teleportation-record
• http://physicsworld.com/blog/2012/05/quantum_teleportation_record_b.html

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Mystery Spot and Physics

Mystery spot is a tourist attraction located near Santa Cruz , California. It is a place where the laws of physics and gravity do not apply.
The Mystery Spot is a gravity hill, a tilt indused visual illusion. In the tilted room of the mystery spot , misperceptions of the height and orientation of objects occur. Explain.

(Asked by G Saranya)

Answer:

The question on gravity hills (also called magnetic hills) is already answered. Please refer to http://askphysics.com/gravitation/magnetic-hills-gravity-hills/

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You are standing on a bathroom scale in an elevator the is moving upward at constant speed, when suddenly the cable breaks. from just before to just after the cable breaks, the reading on the scale will be?