A theorized scheme uses lasers to produce space-time quasicrystals in a plasma—density fluctuations that could be used as diffraction gratings for high-intensity laser pulses.
In modern computers, errors during processing and storage of information have become a rarity due to high-quality fabrication. However, for critical applications, where even single errors can have serious effects, error correction mechanisms based on redundancy of the processed data are still used.
In modern computers, errors during processing and storage of information have become a rarity due to high-quality fabrication. However, for critical applications, where even single errors can have serious effects, error correction mechanisms based on redundancy of the processed data are still used.
Quantum computers are inherently much more susceptible to disturbances and will thus probably always require error correction mechanisms, because otherwise errors will propagate uncontrolled in the system and information will be lost. Because the fundamental laws of quantum mechanics forbid copying quantum information, redundancy can be achieved by distributing logical quantum information into an entangled state of several physical systems, for example multiple individual atoms.
The team led by Thomas Monz of the Department of Experimental Physics at the University of Innsbruck and Markus Müller of RWTH Aachen University and Forschungszentrum Jülich in Germany has now succeeded for the first time in realizing a set of computational operations on two logical quantum bits that can be used to implement any possible operation. “For a real-world quantum computer, we need a universal set of gates with which we can program all algorithms,” explains Lukas Postler, an experimental physicist from Innsbruck.
Scientists realize quantum teleportation between remote, non-neighboring nodes in a quantum network. The network employs three optically connected nodes based on solid-state spin qubits. The teleporter is prepared by establishing remote entanglement on the two links, followed by entanglement swapping on the middle node and storage in a memory qubit.
They demonstrate that once successful preparation of the teleporter is heralded, arbitrary qubit states can be teleported with fidelity above the classical bound, even with unit efficiency. These results are enabled by key innovations in the qubit readout procedure, active memory qubit protection during entanglement generation and tailored heralding that reduces remote entanglement infidelities.
This demonstrates a prime building block for future quantum networks and opens the door to exploring teleportation-based multi-node protocols and applications.
Marcus said the Turing test is not a reliable measure of intelligence because humans are susceptible, and machines can be evasive. Philosopher John Searle introduced the Chinese Room Argument that asserts programming a digital computer may make it appear to understand the language but could not produce real understanding. Even if a computer can interpret symbols and provide sensical responses, it can’t be said to be truly “conscious” because it doesn’t really understand what the symbols mean.
Hector Levesque, a computer scientist at the University of Toronto, proposed the Winograd schema challenge in 2011. Ernest Davis, Leora Morgenstern, Charles Ortiz, and Gary Marcus developed the schema further. Hector designed it as an improvement of the Turing test. The test is structured with multiple-choice questions called Winograd schemas.
Winograd schemas were named after Terry Winograd, professor of computer science at Stanford University. It is a pair of sentences whose intended meaning can be flipped by changing just one word. They generally involve unclear pronouns or possessives.
Posted in computing
Circa 2010 😀 😍
Molecules that arrange themselves into predictable patterns on silicon chips could lead to microprocessors with much smaller circuit elements.
Circa 2021
Simple system revealed for controlling the properties of graphene electrons.
Circa 2021 a room temperature scalable quantum computer 😁
Microcombs operating in the deterministic quantum regime could lead to new applications. Here, the authors demonstrate a quantum microcomb consisting of 20 two-mode squeezed comb pairs, in an optical microresonator on a silicon chip.
Who you gonna call?An Elon Musk deepfake video is doing the rounds on the internet again, hoping to trap crypto holders in a ‘get-rich-quick’ scheme and then steal their deposits, Bleeping Computer reported.
Channel 24 in Ukraine broadcast a deepfake of Ukrainian president Zelenskyy telling Ukrainians to put down their arms and surrender.
