Acoustic waves in gases, liquids, and solids usually travel at an almost constant speed of sound. Rotons are an exception: their speed of sound changes significantly with the wavelength, it is also possible that the […]
The other night Dana and I watched “The Internet’s Own Boy,” the 2014 documentary about the life and work of Aaron Swartz, which I’d somehow missed when it came out. Swartz, for anyone who doesn’t […]
Photo by Carles Rabada on Unsplash Defined Geographical Location In size and geographic region, Silicon Valley (the Santa Clara Valley) covers an area from the city of San Jose to Palo Alto, though many people include […]
Hiromitsu Takeuchi, a lecturer at the Graduate School of Science, Osaka City University, and a researcher at the Nambu Yoichiro Institute of Theoretical and Experimental Physics (NITEP), has theoretically identified the nature of a mysterious […]
Inside each proton or neutron there are three quarks bound by gluons. Until now, it has often been assumed that two of them form a “stable” pair known as a diquark. It seems, however, that […]
Quantum coherence is a key ingredient of many fundamental tests and applications in quantum technology, including quantum communication, imaging, computing, sensing and metrology. However, the transfer of quantum coherence in free-space has so far been […]
Quantum 5, 474 (2021). https://doi.org/10.22331/q-2021-06-10-474 At the dawn of Quantum Physics, Wigner and Weisskopf obtained a full analytical description (a $textit{photon portrait}$) of the emission of a single photon by a two-level system, using the […]
Quantum 5, 473 (2021). https://doi.org/10.22331/q-2021-06-10-473 Recently a new class of quantum algorithms that are based on the quantum computation of the connected moment expansion has been reported to find the ground and excited state energies. […]
Quantum 5, 472 (2021). https://doi.org/10.22331/q-2021-06-10-472 This work analyzes correlations arising from quantum systems subject to sequential projective measurements to certify that the system in question has a quantum dimension greater than some $d$. We refine […]
Over the past century, quantum field theory has proved to be the single most sweeping and successful physical theory ever invented. It is an umbrella term that encompasses many specific quantum field theories — the […]
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