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For the first ever time, MIT scientists have quantified the temporal coherence (lifetime) of graphene qubits-meaning to what extent it can keep up a special state that enables it to speak to two coherent states at the same time.

As of late, specialists have been incorporating graphene-based materials into superconducting quantum computing gadgets, which guarantee quicker, progressively proficient computing, among different advantages. Up to this point, be that as it may, there’s been no recorded coherence for these advanced qubits, so there’s no knowing whether they’re feasible for practical quantum computing.

In a new study, scientists demonstrated a coherent qubit made from graphene and exotic materials. These materials empower the qubit to change states through voltage, much like transistors in today’s traditional computer chips — and not at all like most different kinds of superconducting qubits. Also, the specialists put a number to that coherence, timing it at 55 nanoseconds, before the qubit comes back to its ground state.

Information teleported between stationary qubits without a direct link.

https://www.youtube.com/watch?v=HvJGsF4t2Tc

The king is dead, long live the king… of supercomputers!

In this video I discuss New Fastest Supercomputer in the World and the first official Exascale supercomputer — Frontier Supercomputer located at Oak Ridge Lab.

Continue reading “New World’s Fastest Supercomputer Explained” »

As physicists dig deeper into the quantum realm, they are discovering an infinitesimally small world composed of a strange and surprising array of links, knots, and winding. Some quantum materials exhibit magnetic whirls called skyrmions — unique configurations sometimes described as “subatomic hurricanes.” Others host a form of superconductivity that twists into vortices.

Now, in an article published in the journal Nature, a Princeton-led team of scientists has discovered that electrons in quantum matter can link one another in strange new ways. The work brings together ideas in three areas of science – condensed matter physics, topology, and knot theory – in a new way, raising unexpected questions about the quantum properties of electronic systems.

Topology is the branch of theoretical mathematics that studies geometric properties that can be deformed but not intrinsically changed. Topological quantum states first came to the public’s attention in 2016 when three scientists, including Duncan Haldane, who is Princeton’s Thomas D. Jones Professor of Mathematical Physics and Sherman Fairchild University Professor of Physics, were awarded the Nobel Prize for their theoretical prediction of topology in electronic materials.

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The experiment will investigate the Unruh effect, which is produced by a mixture of quantum mechanics and special relativity.

A completely new kind of molecule has been made by combining an extremely cold ion and a super-sized atom. The unusual molecular bond between the two particles was thousands of times longer than those in most room-temperature molecules, and the method to make and study it could kick-start a new branch of ultracold quantum chemistry.

For instance, continuous-variable (CV) QKD has its own distinct advantages at a metropolitan distance^36,37 due to the use of common components of coherent optical communication technology. In addition, the homodyne³⁸ or heterodyne³⁹ measurements used by CV-QKD have inherent extraordinary spectral filtering capabilities, which allows the crosstalk in wavelength division multiplexing (WDM) channels to be effectively suppressed. Therefore, hundreds of QKD channels may be integrated into a single optical fiber and can be cotransmitted with classic data channels. This allows QKD channels to be more effectively integrated into existing communication networks. In CV-QKD, discrete modulation technology has attracted much attention^{31,40,41,42,43,44,45,46,47,48,49,50} because of its ability to reduce the requirements for modulation devices. However, due to the lack of symmetry, the security proof of discrete modulation CV-QKD also mainly relies on numerical methods^{43,44,45,46,47,48,51}.

Unfortunately, calculating a secure key rate by numerical methods requires minimizing a convex function over all eavesdropping attacks related with the experimental data^52,53. The efficiency of this optimization depends on the number of parameters of the QKD protocol. For example, in discrete modulation CV-QKD, the number of parameters is generally \(1000–3000\) depending on the different choices of cutoff photon numbers⁴⁴. This leads to the corresponding optimization possibly taking minutes or even hours⁵¹. Therefore, it is especially important to develop tools for calculating the key rate that are more efficient than numerical methods.

In this work, we take the homodyne detection discrete-modulated CV-QKD⁴⁴ as an example to construct a neural network capable of predicting the secure key rate for the purpose of saving time and resource consumption. We apply our neural network to a test set obtained at different excess noises and distances. Excellent accuracy and time savings are observed after adjusting the hyperparameters. Importantly, the predicted key rates are highly likely to be secure. Note that our method is versatile and can be extended to quickly calculate the complex secure key rates of various other unstructured quantum key distribution protocols. Through some open source deep learning frameworks for on-device inference, such as TensorFlow Lite⁵⁴, our model can also be easily deployed on devices at the edge of the network, such as mobile devices, embedded Linux or microcontrollers.

The famous double-slit experiment–a now classic showcase of how both light and matter are able to behave as both waves, and particles in their “classical” physical definition–seems almost like magic to many of us.

Because of this unusual function of our physical universe, the double-slit experiment has intrigued physicists for decades, as it suggests the possibility of multiple universes or weird quantum events. However, only recently have researchers at the Vienna University of Technology (TU Wien) found a way to fully validate this experiment, using a particular measurement method on the particle.

Can quantum science supercharge genetics? | Jim Al-Khalili for Big Think.

This interview is an episode from The Well, our new publication about ideas that inspire a life well-lived, created with the John Templeton Foundation.

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