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re: MIT advances quantum magnetism
Josato   1/4/2013 2:06:52 PM
Quantum entanglement transmits information instantaneously, so faster than the speed of light.

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re: MIT advances quantum magnetism
Bert22306   12/30/2012 8:18:52 PM
But this article was not about quantum communications in general, but rather about the discovery of a third type of magnetism, the quantum spin liquid (actually a crystal substance, but the magnetic particles in it behave like a liquid). But the really big deal is that these magnetic particles can take on non-discrete quantum states. Fractional states, in other words, which is a really foreign concept in quantum mechanics so far. http://www.sciencedaily.com/releases/2012/12/121220143745.htm

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re: MIT advances quantum magnetism
Bert22306   12/30/2012 7:58:44 PM
Quantum communications means communications which are based on quantum mechanics. Instead of thinking in terms of voltage and current, for instance, one approaches comms which depend on the emission of single photons, from an atom at the source to an atom at a destination. One photon through a cavity, along with that photon's polarity, changes the state of one atom at the opposite end of that cavity. That single atom change of state can represent a zero or one bit value of information transfer. Think of the single photon exciting an electron at the destination to a higher energy level, with + or - spin. If the atom at the end of the cavity can be retained in a given state, the scheme can also be used for data storage. Point being, though, that photons must still trevel through the cavity (transmission channel). Which says that info transfer is still limited to the speed of light.

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re: MIT advances quantum magnetism
MeirG   12/27/2012 6:59:07 PM
Dear Sylvie, "Quantum communication, based on quantum entanglement, which does not rely on information transmission, would be a near instantaneous way of propagating information. The change in the state of one particle would simply change the state of another particle." Please check your physics again...

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re: MIT advances quantum magnetism
DCH0   12/26/2012 4:19:49 PM
from Wikipedia: "Dr. George Frederick Herbert Smith (1872–1953), was a British mineralogist who worked for the British Museum of Natural History.[1] He discovered the mineral paratacamite in 1906. He also developed the first efficient jeweller's refractometer."

As data rates begin to move beyond 25 Gbps channels, new problems arise. Getting to 50 Gbps channels might not be possible with the traditional NRZ (2-level) signaling. PAM4 lets data rates double with only a small increase in channel bandwidth by sending two bits per symbol. But, it brings new measurement and analysis problems. Signal integrity sage Ransom Stephens will explain how PAM4 differs from NRZ and what to expect in design, measurement, and signal analysis.

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