A trapped-ion-based quantum computer that fits in two boxes, each the size of a studio apartment’s shower, can create fully entangled 24-particle state.

Radiotherapy (RT) is generally considered to be one of the most effective cancer treatments. The primary goal of RT is to accurately induce radiation damage to the tumor while limiting radiation toxicity to a level acceptable to normal tissue. This is accomplished by targeting the tumor with radiation. On the other hand, the status of RT procedures as they stand today is not substantial enough ...

A compact mesh architecture for supporting the relation collection step of the number field sieve is described. Differing from TWIRL, only isolated chips without inter-chip communication are used. According to a preliminary analysis for 768-bit numbers, with a 0.13 μm process one mesh-based device fits on a single chip of ≈(4.9 cm)—the largest proposed chips in the TWIRL cluster for 768-bit occ...

The gravitational tug of galaxies on orbiting stars, gas clouds, other galaxies, and light reveals that the galaxies have much more mass than their visible constituents provide [1]. From what we know of the primordial abundances of the lightest elements, over 80% of this dark matter is not made of baryons, that is, particles like protons and neutrons, but rather consists of particles not yet ob...

Several different “hat games” have recently received a fair amount of attention. Typically, in a hat game, one or more players are required to correctly guess their hat colour when given some information about other players’ hat colours. Some versions of these games have been motivated by research in complexity theory and have ties to well-known research problems in coding theory, and some vari...

We describe experiments using single-particle tracking in which mean-square displacement is simply proportional to time (Fickian), yet the distribution of displacement probability is not Gaussian as should be expected of a classical random walk but, instead, is decidedly exponential for large displacements, the decay length of the exponential being proportional to the square root of time. The f...

've always been an avid traveler and often look forward to planning summer trips to faraway destinations. However , whether by train, plane, or automobile , long-distance travel for the majority of us usually comes with some degree of discomfort—long periods of time sitting in a seat with a limited selection of things to do. Fun traveling companions and a good book can help, but faced with a lo...