Quantum Physics

   

Two-Ion Quantum Logic Gate

Authors: George Rajna

The theory group led by Gonzalo Muga of the UPV/EHU's Department of Physical Chemistry has teamed up with the experimental group of the National Institute of Standards and Technology in Boulder, United States, led by David Wineland, the 2012 Nobel Physics Laureate, to design a two-ion, robust, ultrarapid quantum logic gate capable of functioning in less than a microsecond. [20] The new substance may be useful for phonon-based quantum computers, and it may also shed light on the conditions required to form biological Fröhlich condensates of collective modes. [19] Scientists have built tiny logic machines out of single atoms that operate completely differently than conventional logic devices do. [18] Extremely short, configurable "femtosecond" pulses of light demonstrated by an international team could lead to future computers that run up to 100,000 times faster than today's electronics. [17] Physicists from the Faculty of Physics at the University of Warsaw have developed a holographic atomic memory device capable of generating single photons on demand in groups of several dozen or more. The device, successfully demonstrated in practice, overcomes one of the fundamental obstacles towards the construction of a quantum computer. [16] Random number generators are crucial to the encryption that protects our privacy and security when engaging in digital transactions such as buying products online or withdrawing cash from an ATM. For the first time, engineers have developed a fast random number generator based on a quantum mechanical process that could deliver the world's most secure encryption keys in a package tiny enough to use in a mobile device. [15] Researchers at the University of Rochester have moved beyond the theoretical in demonstrating that an unbreakable encrypted message can be sent with a key that's far shorter than the message—the first time that has ever been done. [14] Quantum physicists have long thought it possible to send a perfectly secure message using a key that is shorter than the message itself. Now they’ve done it. [13] What once took months by some of the world's leading scientists can now be done in seconds by undergraduate students thanks to software developed at the University of Waterloo's Institute for Quantum Computing, paving the way for fast, secure quantum communication. [12] The artificial intelligence system's ability to set itself up quickly every morning and compensate for any overnight fluctuations would make this fragile technology much more useful for field measurements, said co-lead researcher Dr Michael Hush from UNSW ADFA. [11] Quantum physicist Mario Krenn and his colleagues in the group of Anton Zeilinger from the Faculty of Physics at the University of Vienna and the Austrian Academy of Sciences have developed an algorithm which designs new useful quantum experiments. As the computer does not rely on human intuition, it finds novel unfamiliar solutions. [10] Researchers at the University of Chicago's Institute for Molecular Engineering and the University of Konstanz have demonstrated the ability to generate a quantum logic operation, or rotation of the qubit, that - surprisingly—is intrinsically resilient to noise as well as to variations in the strength or duration of the control. Their achievement is based on a geometric concept known as the Berry phase and is implemented through entirely optical means within a single electronic spin in diamond. [9]

Comments: 32 Pages.

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[v1] 2017-03-24 05:25:22

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