Phys.org August 15, 2019 A team of researchers in the US (New York University, Wayne State University, SUNY Buffalo) have shown the experimental evidence for a topological superconductivity. They analyzed a transition of quantum state from its conventional state to a new topological state, measuring the energy barrier between these states focusing on majorana particles. Majorana particles have the potential to store quantum information in a special computation space where quantum information is protected from the environment noise. As there is no natural host material for these particles the new form of matter provides a platform on which these calculations […]
Tag Archives: Quantum science
Physicists use light waves to accelerate supercurrents, enable ultrafast quantum computing
Science Daily July 1, 2019 A team of researchers in the US (Iowa State University, University of Wisconsin, University of Alabama at Birmingham) is finding new macroscopic supercurrent flowing states and developing quantum controls for switching and modulating them. Experimental data obtained from a terahertz spectroscopy instrument indicates terahertz light-wave tuning of supercurrents is a universal tool and key for pushing quantum functionalities to reach their ultimate limits in many cross-cutting disciplines, design of emergent materials properties and collective coherent oscillations for quantum engineering applications…read more. TECHNICAL ARTICLES
Physicists develop new method to prove quantum entanglement
Phys.org June 25, 2019 Building on a recent theoretical scheme, an international team of researchers (Austria, Serbia) successfully demonstrated that entanglement verification can be undertaken in a surprisingly efficient way and in a very short time, thus making this task applicable also to large-scale quantum systems. To test their new method, they experimentally produced a quantum system composed of six entangled photons. The results show that only a few experimental runs suffice to confirm the presence of entanglement with extremely high confidence, up to 99.99 percent. After a quantum system has been generated in the laboratory, the scientists carefully choose […]
Researchers teleport information within a diamond
EurekAlert June 28, 2019 Researchers in Japan have demonstrated quantum state transfer of photon polarization into a carbon isotope nuclear spin coupled to a nitrogen-vacancy center in diamond based on photon-electron Bell state measurement by photon absorption. The carbon spin is first entangled with the electron spin, which is then permitted to absorb a photon into a spin-orbit correlated eigenstate. Detection of the electron after relaxation into the spin ground state allows post-selected transfer of arbitrary photon polarization into the carbon memory. The study has big implications for quantum information technology…read more. Open Access TECHNICAL ARTICLE
Long-distance quantum information exchange—success at the nanoscale
Phys.org March 15, 2019 An international team of researchers (Denmark, Australia, USA – Purdue University) discovered that by placing a large, elongated quantum dot between the left dots and right dots, it can mediate a coherent swap of spin states, within a billionth of a second, without ever moving electrons out of their dots. In other words, we now have both fast interaction and the necessary space for the pulsed gate electrodes. The research may have profound implications for the architecture of solid-state quantum computers allowing the realization of networks in which the increased qubit-qubit connectivity translated into a significantly […]
Questions in quantum computing—how to move electrons with light
Phys.org February 12, 2019 To study the light-matter interaction an international team of researchers (japan, Ukraine) coupled the cyclotron motion of a collection of electrons on the surface of liquid helium to the microwave field. For the corotating component of the microwave field, the strong coupling is pronouncedly manifested by the normal-mode splitting in the spectrum of coupled field-particle motion. For the counterrotating component of the microwave field, they observed a strong resonance when the microwave frequency is close to both the cyclotron and cavity frequencies. They found that fluctuations in the speed, location or overall charge of individual electrons […]
Scientists move quantum optic networks a step closer to reality
Nanowerk January 2, 2019 A team of researchers in the US (Argonne National Laboratory, University of Chicago, Northwestern University) found that absorption dipoles in individual quasi-two-dimensional nanoplatelets are isotropic in three dimensions at the excitation wavelength. Emission anisotropy can be readily explained by the electric field renormalization effect caused by the dielectric contrast between the NPLs and the surrounding medium. They concluded that emission dipoles in NPLs are isotropic in the plane of the NPLs. The findings present an approach for disentangling the effects of dipole degeneracy and electric field renormalization on emission anisotropy and can be adapted for studying […]
The man turning China into a quantum superpower
MIT Technology Review December 19, 2018 An international team of scientists (Austria, China) made possible an unhackable videoconference between Vienna and Beijing. They include a plan to create a globe-spanning constellation of satellites that constitute a super-secure quantum internet. As funding for government programs is opaque, it could be $1.1 billilon. In spite of this China still trails the US in quantum computing. If China thinks the technology could give it a military edge, it might pull back on international collaborations and keep innovations to itself. Close coordination between Chinese government research groups, the Chinese Academy of Sciences, and the […]
Researchers demonstrate teleportation using on-demand photons from quantum dots
Phys.org December 17, 2018 Despite recent advances, the exploitation of deterministic quantum light sources in push-button quantum teleportation schemes remains a major open challenge. An international team of researchers (Austria, Italy, Sweden) has shown that photon pairs generated on demand by a GaAs quantum dot can be used to implement a teleportation protocol whose fidelity violates the classical limit (by more than 5 SDs) for arbitrary input states. They developed a theoretical framework that matches the experimental observations and that defines the degree of entanglement and indistinguishability needed to overcome the classical limit independently of the input state. The results […]
Quantum artificial life created on the cloud
Phys.org November 16, 2018 An international team of researchers (UK, Spain) has developed a quantum biomimetic protocol that reproduces the characteristic process of Darwinian evolution adapted to the language of quantum algorithms and quantum computing. The research is aimed at designing a set of quantum algorithms based on the imitation of biological processes, which take place in complex organisms, and transfer them to a quantum scale. The researchers anticipate a future in which machine learning, artificial intelligence and artificial life itself will be combined on a quantum scale…read more. Open Access TECHNICAL ARTICLE