Authors: George Rajna
Single-photon detectors (SPDs) are now key to research areas ranging from optical communications and astrophysics to cutting-edge information technologies based on quantum physics, such as quantum cryptography and quantum teleportation.  "The realization of such all-optical single-photon devices will be a large step towards deterministic multi-mode entanglement generation as well as high-fidelity photonic quantum gates that are crucial for all-optical quantum information processing," says Tanji-Suzuki.  Researchers at ETH have now used attosecond laser pulses to measure the time evolution of this effect in molecules.  A new benchmark quantum chemical calculation of C2, Si2, and their hydrides reveals a qualitative difference in the topologies of core electron orbitals of organic molecules and their silicon analogues.  A University of Central Florida team has designed a nanostructured optical sensor that for the first time can efficiently detect molecular chirality-a property of molecular spatial twist that defines its biochemical properties.  UCLA scientists and engineers have developed a new process for assembling semiconductor devices.  A new experiment that tests the limit of how large an object can be before it ceases to behave quantum mechanically has been proposed by physicists in the UK and India.  Phonons are discrete units of vibrational energy predicted by quantum mechanics that correspond to collective oscillations of atoms inside a molecule or a crystal.  This achievement is considered as an important landmark for the realization of practical application of photon upconversion technology.  Considerable interest in new single-photon detector technologies has been scaling in this past decade.  Engineers develop key mathematical formula for driving quantum experiments. 
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[v1] 2019-12-21 01:59:44
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