Computer Sciences
A team of researchers affiliated with a host of institutions across China has modified Shor's algorithm in a way that could allow less powerful quantum computers to crack current cryptosystems. The team describes their modifications ...
Computer Sciences
Researchers at Tohoku University, the University of Messina, and the University of California, Santa Barbara (UCSB) have developed a scaled-up version of a probabilistic computer (p-computer) with stochastic spintronic devices ...
Dec 7, 2022
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93
Computer Sciences
Computers help physicists solve complicated calculations. But some of these calculations are so complex that a regular computer is not enough. In fact, some advanced calculations tax even the largest supercomputers. Now, ...
Nov 15, 2022
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107
Telecom
NIST, in collaboration with CU Boulder faculty, published a paper titled: "RF Josephson Arbitrary Waveform Synthesizer with Integrated Superconducting Diplexers" demonstrating results that show a significant step toward a ...
Nov 11, 2022
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114
Energy & Green Tech
As climate change intensifies summer heat, demand is growing for technologies to cool buildings. Now, researchers report in ACS Energy Letters that they have used advanced computing technology and artificial intelligence ...
Nov 2, 2022
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88
Computer Sciences
Neural networks are learning algorithms that approximate the solution to a task by training with available data. However, it is usually unclear how exactly they accomplish this. Two young Basel physicists have now derived ...
Sep 30, 2022
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206
Electronics & Semiconductors
Many state-of-the-art technologies work at incredibly low temperatures. Superconducting microprocessors and quantum computers promise to revolutionize computation, but scientists need to keep them just above absolute zero ...
Sep 16, 2022
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105
Computer Sciences
In modern cryptosystems, users generate public and private keys that guarantee security based on computational complexity and use them to encrypt and decrypt information. Recently however, modern public-key cryptosystems ...
Jul 22, 2022
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154
Electronics & Semiconductors
Acoustic waves are slower than electromagnetic waves of the same frequency but, even in the high-speed world of computing and communications, that's not a bad thing. Short acoustic waves are easy to confine in nanoscale ...
Jun 28, 2022
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247
Electronics & Semiconductors
Logic gates, the basic elements of the digital world, can now be built using one single molecule. An example is XOR, with two inputs. If at least one of them is "1," then the output is "1," as well; otherwise, it is 0. These ...
Jun 15, 2022
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87
In physics, a quantum (plural: quanta) is an indivisible entity of a quantity that has the same units as the Planck constant and is related to both energy and momentum of elementary particles of matter (called fermions) and of photons and other bosons. The word comes from the Latin "quantus", for "how much." Behind this, one finds the fundamental notion that a physical property may be "quantized", referred to as "quantization". This means that the magnitude can take on only certain discrete numerical values, rather than any value, at least within a range. There is a related term of quantum number.
A photon is often referred to as a "light quantum". The energy of an electron bound to an atom (at rest) is said to be quantized, which results in the stability of atoms, and of matter in general. But these terms can be a little misleading, because what is quantized is this Planck's constant quantity whose units can be viewed as either energy multiplied by time or momentum multiplied by distance.
Usually referred to as quantum "mechanics", it is regarded by virtually every professional physicist as the most fundamental framework we have for understanding and describing nature at the infinitesimal level, for the very practical reason that it works. It is "in the nature of things", not a more or less arbitrary human preference.
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