The Knowledge Factory - Sur le même thème https://www.cea.fr/drf/english/Pages/News/Scientific-results/2022/observation-of-the-electric-dipole-associated-with-spin-waves-in-graphene.aspx DRF english version en-US https://www.cea.fr/_layouts/15/images/i2i/icon-144x144-1033.png The Knowledge Factory - Sur le même thème https://www.cea.fr/drf/english Record coherence time for a hole spin in natural silicon https://www.cea.fr/drf/english/Pages/News/Scientific-results/2022/record-coherence-time-for-a-hole-spin-in-natural-silicon.aspx Researchers at the CEA-Irig have demonstrated that there is an optimal configuration for bringing the coherence times of hole spins closer to those of electron spins. Spintronics ; Quantum Physics ; Micro-nanotechnologies general public ; Journalists ; Researchers Découvertes et avancées ; Scientific result Thu, 22 Sep 2022 10:00:00 GMT A key role for quantum entanglement https://www.cea.fr/drf/english/Pages/News/Scientific-results/2022/a-key-role-for-quantum-entanglement.aspx A method known as quantum key distribution has long held the promise of communication security unattainable in conventional cryptography. An international team of scientists has now demonstrated experimentally, for the first time, an approach to quantum key distribution that is based on high-quality quantum entanglement — offering much broader security guarantees than previous schemes. Quantum Physics ; Communications ; Defence & security general public ; Journalists ; Researchers IPhT Découvertes et avancées ; Scientific result Wed, 27 Jul 2022 15:00:00 GMT Developing an identity card for each quantum bit on silicon https://www.cea.fr/drf/english/Pages/News/Scientific-results/2022/developing-an-identity-card-for-each-quantum-bit-on-silicon.aspx Using a “pump-probe” spectroscopic technique, researchers at the CEA-Irig have succeeded in creating an authentic identity map of individual quantum bits, based on the spin of holes in silicon. This is an essential task that can easily be extrapolated to high qubit densities! Spintronics ; Micro-nanoelectronics ; Quantum Physics general public ; Journalists ; Researchers IRIG Découvertes et avancées ; Scientific result Tue, 18 Jan 2022 11:00:00 GMT Detecting spins with a single photon counter https://www.cea.fr/drf/english/Pages/News/Scientific-results/2022/detecting-spins-with-a-single-photon-counter.aspx According to researchers from the CEA-Iramis, it is now possible to detect spins thanks to an original method using a single photon sensor that is insensitive to noise. This is a major step forward for the measurement of spin quantum bits or their conversion into photons. Quantum Physics ; Spintronics general public ; Journalists ; Researchers Iramis Découvertes et avancées ; Scientific result Fri, 17 Dec 2021 11:00:00 GMT Observation of the electric dipole associated with spin waves in graphene https://www.cea.fr/drf/english/Pages/News/Scientific-results/2022/observation-of-the-electric-dipole-associated-with-spin-waves-in-graphene.aspx Using an electronic analog of a Mach-Zehnder interferometer, researchers from the CEA-Iramis and their partners observed for the first time the electric dipole associated with spin waves (magnons) in a ferromagnet in the quantum Hall regime. These spin waves could be used in particular to transfer information from one quantum bit to another. Quantum Physics ; Micro-nanoelectronics general public ; Journalists ; Researchers Iramis Découvertes et avancées ; Scientific result Fri, 17 Dec 2021 11:00:00 GMT Quantum physics: a record coherence time for erbium spins https://www.cea.fr/drf/english/Pages/News/Scientific-results/2022/quantum-physics-a-record-coherence-time-for-erbium-spins.aspx Researchers from CEA-Iramis have demonstrated that, contrary to what is generally believed, the electronic spin carried by erbium can have a long coherence time. This makes it a good candidate for relaying quantum information via photons. Quantum Physics ; Spintronics general public ; Journalists ; Researchers Iramis Découvertes et avancées ; Scientific result Fri, 17 Dec 2021 11:00:00 GMT Paired with quantum memory, quantum computers can “shrink” by a factor of a thousand! https://www.cea.fr/drf/english/Pages/News/Scientific-results/2021/paired-with-quantum-memory-quantum-computers-can-shrink-by-a-factor-of-a-thousand.aspx Theoretical physicists at the IPhT have shown that by equipping a quantum processor with quantum memory, it is possible to reduce the number of quantum bits needed to solve an emblematic problem by three orders of magnitude. Computing ; Quantum Physics general public ; Journalists ; Researchers IPhT Découvertes et avancées ; Scientific result Tue, 28 Sep 2021 10:00:00 GMT Quantum physics finds its way into the heart of flowers https://www.cea.fr/drf/english/Pages/News/Scientific-results/2021/quantum-physics-finds-its-way-into-the-heart-of-flowers.aspx Researchers from the CEA-Joliot (I2BC) and their partners have deciphered for the first time the quantum process of energy dissipation in aggregates of natural flower carotenoids. This fundamental biological mechanism could inspire the design of photovoltaic materials capable of supplying two electrons for every photon. Molecular mechanisms ; Vegetal physiology ; Quantum Physics ; Photovoltaic solar power general public ; Journalists ; Researchers Joliot Découvertes et avancées ; Scientific result Fri, 03 Sep 2021 10:00:00 GMT A microwave photon disappears in an array of superconducting Josephson junctions https://www.cea.fr/drf/english/Pages/News/Scientific-results/2021/a-microwave-photon-disappears-in-an-array-of-superconducting-josephson-junctions.aspx It is as if a microwave photon interacting with a small superconducting junction was split into several photons of lower energy! This is the scenario proposed by an IRIG researcher to interpret recent experiments using a network of superconducting Josephson junctions. Quantum Physics ; Micro-nanotechnologies ; Photonics ; Theoretical physics general public ; Journalists ; Researchers IRIG Découvertes et avancées ; Scientific result Wed, 09 Jun 2021 10:00:00 GMT Accelerating electrons without diverting them using a radially polarized laser https://www.cea.fr/drf/english/Pages/News/Scientific-results/2021/accelerating-electrons-without-diverting-them-using-a-radially-polarized-laser.aspx Researchers from the CEA-Iramis and the Laboratoire d’Optique Appliquée (ENSTA/X/CNRS) have succeeded for the first time in efficiently accelerating electrons to relativistic energies using a radially polarized laser. Particle accelerator ; Laser ; Quantum Physics general public ; Journalists ; Researchers Découvertes et avancées ; Scientific result Tue, 27 Apr 2021 10:00:00 GMT Cryo-CMOS electronics for quantum applications https://www.cea.fr/drf/english/Pages/News/Scientific-results/2021/cryo-cmos-electronics-for-quantum-applications.aspx Scientists at CEA-Irig, in close collaboration with CEA-Leti, achieved a unique integration of classical electronics with a quantum system. They demonstrate the possibility of measuring current through quantum dots by CMOS circuitry on a single chip cooled to 10 millikelvin, in Fully Depleted Silicon On Insulator (FD-SOI) technology. Micro-nanoelectronics ; Micro-nanotechnologies ; New technologies ; Quantum Physics general public ; Journalists ; Researchers IRIG Scientific result Thu, 25 Mar 2021 11:00:00 GMT Fortunately enough, a high resistance does not make a superconducting Josephson junction insulating! https://www.cea.fr/drf/english/Pages/News/Scientific-results/2021/fortunately-enough-a-high-resistance-does-not-make-a-superconducting-josephson-junction-insulating.aspx Researchers from CEA-Iramis and their partners refute a widely accepted assertion that the coupling of a Josephson junction to a high resistance is constrained. They thus open the way to new high-impedance devices, previously considered unfeasible. Quantum Physics ; Micro-nanoelectronics ; Micro-nanotechnologies ; New technologies general public ; Journalists ; Researchers Iramis Scientific result Thu, 11 Mar 2021 11:00:00 GMT Quantum science: when an artificial atom makes a microwire oscillate https://www.cea.fr/drf/english/Pages/News/Scientific-results/2021/quantum-an-artificial-atom-sets-a-micro-wire-in-motion.aspx A collaboration involving CEA-Irig has succeeded in setting in motion an 18-µm-long mechanical oscillator by optically exciting an embedded artificial atom. This result is an important step towards the realization of interfaces that connect the quantum and classical worlds. Micro-nanotechnologies ; Photonics ; Quantum Physics ; Laser Journalists ; Researchers ; general public IRIG Scientific result Wed, 24 Feb 2021 11:00:00 GMT One entanglement can hide another! https://www.cea.fr/drf/english/Pages/News/Scientific-results/2021/one-entanglement-can-hide-another.aspx A theoretical physicist at the IPhT and his partners at the EPFL (Switzerland) and MIT (USA) have just revealed a temporal form of quantum entanglement. For the first time, this has allowed them to demonstrate a very strong entanglement between a photon and a phonon, in a diamond crystal at room temperature. Their experiment makes it possible to probe the coherence of single phonons on very short time scales, which opens the door to the search for materials for ultrafast quantum technologies. Quantum Physics ; Theoretical physics ; Laser general public ; Journalists ; Researchers IPhT Scientific result Fri, 19 Feb 2021 11:00:00 GMT “Quantum supremacy” on a laptop computer? https://www.cea.fr/drf/english/Pages/News/Scientific-results/2021/quantum-supremacy-on-a-laptop-computer.aspx A researcher at the CEA-Irig and his partners have demonstrated that a real (and therefore imperfect) quantum computer is several billion times easier to simulate than a perfect quantum computer! Their conclusion: before increasing the number of quantum bits, it is essential to improve their fidelity. Quantum Physics general public ; Journalists ; Researchers IRIG Scientific result Tue, 12 Jan 2021 11:00:00 GMT New two-dimensional materials for skyrmions https://www.cea.fr/drf/english/Pages/News/Scientific-results/2021/new-two-dimensional-materials-for-skyrmions.aspx Researchers from the CEA-Irig and their partners in France and China are proposing a new family of asymmetric, two-dimensional materials that could produce magnetic skyrmions. These “nano-whirlpools” of magnetization hold promise for next-generation magnetic memories. Spintronics ; Micro-nanotechnologies ; Quantum Physics general public ; Journalists ; Researchers IRIG Scientific result Thu, 17 Dec 2020 11:00:00 GMT When an electron submerged in the Fermi Sea resurfaces... https://www.cea.fr/drf/english/Pages/News/Scientific-results/2021/when-an-electron-submerged-in-the-fermi-sea-resurfaces--.aspx Researchers at Iramis and their partners have succeeded in following the fate of single electrons injected into one-dimensional electronic channels of the quantum Hall regime. These electrons “dissolve” in collective excitations distributed across all parallel channels, and can reappear as a result of constructive interference between these excitations. This is a step forward in the understanding of electron quantum optics. Micro-nanoelectronics ; Micro-nanotechnologies ; Quantum Physics general public ; Journalists ; Researchers Iramis Scientific result Wed, 16 Dec 2020 11:00:00 GMT A single photon takes two optical paths by “entangling” them! https://www.cea.fr/drf/english/Pages/News/Scientific-results/2020/a-single-photon-takes-two-optical-paths-by-entangling-them.aspx An IPhT researcher and his partners from the Universities of Geneva and Basel have succeeded for the first time in “entangling” the outputs of two optical fibers sharing a single photon at a distance of 2 km. In this amazing feat, they show how a form of quantum entanglement that is simple to produce can be distributed and then detected over long distances. This is an important step towards the construction of a secure quantum internet! Quantum Physics ; Fundamental Research ; Communications general public ; Journalists ; Researchers IPhT Scientific result Fri, 02 Oct 2020 10:00:00 GMT Quantum physics: adding “noise” as a means to completely secure communication https://www.cea.fr/drf/english/Pages/News/Scientific-results/2020/quantum-physics-adding-noise-as-a-means-to-completely-secure-communication.aspx How can the confidentiality of communications be protected if we cannot absolutely trust the devices used to communicate? Researchers from the IPhT, the University of Basel and the ETH Zürich are addressing this question, which is at the heart of quantum cryptography research. Communications ; Quantum Physics general public ; Journalists ; Researchers IPhT Scientific result Wed, 23 Sep 2020 10:00:00 GMT European SpinTronicFactory network publishes spintronics road map https://www.cea.fr/drf/english/Pages/News/Institutional-news/2020/european-spintronicfactory-network-publishes-spintronics-road-map.aspx On August 19, 2020, the European consortium SpinTronicFactory, led by the French laboratories[1] Spintec (CEA, CNRS, Université Grenoble Alpes) and Thales-CNRS Joint Unit (Palaiseau), published an ambitious spintronics road map in Nature Electronics. The field, at the frontier between magnetism and microelectronics, is coming of age, and offers wide possibilities for innovation. Spintronics ; New technologies ; Micro-nanoelectronics general public ; Journalists ; Researchers IRIG Europe Wed, 09 Sep 2020 10:00:00 GMT Cooling electron spins with microwave photons https://www.cea.fr/drf/english/Pages/News/Scientific-results/2020/cooling-electron-spins-with-microwave-photons.aspx A team from the CEA-Iramis has shown that it is possible to bring an ensemble of electron spins to a temperature lower than that of the supporting crystal, thanks to their being coupled to an electromagnetic field within a resonant microwave cavity. This patented discovery greatly improves the detection of EPR (Electron Paramagnetic Resonance) and NMR (Nuclear Magnetic Resonance) signals. Spintronics ; Quantum Physics general public ; Journalists ; Researchers Iramis Scientific result Mon, 15 Jun 2020 10:00:00 GMT Fractional charge carriers make some noise with photons! https://www.cea.fr/drf/english/Pages/News/Scientific-results/2019/fractional-charge-carriers--make-some-noise-with-photons.aspx Researchers from CEA-Iramis have designed a new experimental method using microwave photons that brings additional proof that the electrical charge of carriers may amount to a third or a fifth of the elementary charge of the electron. Moreover, the experiment shows that these fractionally charged carriers (called “anyons”) interact with microwave photons and can therefore be manipulated. This discovery is the first step towards the study of anyons’ quantum and statistical properties. Fundamental Research ; Micro-nanoelectronics ; Quantum Physics general public ; Journalists ; Researchers Iramis Scientific result Mon, 29 Apr 2019 13:03:55 GMT Superconductivity: let’s shake correlated electrons! https://www.cea.fr/drf/english/Pages/News/Scientific-results/2019/superconductivity-lets-shake-correlated-electrons.aspx Theoretical physicists from the IPhT designed a model of a system of highly correlated electrons subjected to a periodic disturbance. This model could be the first step towards the creation of superconducting materials maintaining room temperature, illuminated by a femtosecond laser… Fundamental Research ; Quantum Physics ; Theoretical physics Journalists ; Researchers ; general public IPhT Scientific result Mon, 08 Apr 2019 10:00:00 GMT Measuring MOS quantum bits by radiofrequency reflectometry https://www.cea.fr/drf/english/Pages/News/Scientific-results/2017/measuring-mos-quantum-bits-by-radiofrequency-reflectometry.aspx A team from the Inac has proposed a new method to measure a semiconductor quantum dot by radiofrequency reflectometry. This method, which utilizes MOS technology on silicon, can easily be extrapolated on a larger scale to produce dense quantum bit architectures. Micro-nanoelectronics Researchers ; general public ; Journalists Inac Scientific result Tue, 05 Dec 2017 11:00:00 GMT Stolen Images from a Very Discreet Magnetic Order https://www.cea.fr/drf/english/Pages/News/Scientific-results/2017/stolen-images-from-a-very-discreet-magnetic-order.aspx Physicists from IRAMIS were successful in producing images of the antiferromagnetic order in bismuth ferrite by generating a second harmonic using a femtosecond laser. This result is the first step towards the control of these materials which are seen as promising for data storage applications. Micro-nanoelectronics Researchers ; general public ; Journalists Iramis Scientific result Thu, 26 Oct 2017 10:00:00 GMT The Strange Negative Magnetoresistance of MoSe2 https://www.cea.fr/drf/english/Pages/News/Scientific-results/2017/the-strange-negative-magnetoresistance-of-mose2.aspx A team from INAC has produced and characterized, for the first time, a layer of molybdenum diselenide (MoSe2) with a triatomic thickness on an extended surface of about 1 cm². Electric conduction is more elaborate than in a classic semiconductor (“Mott gaps”) and decreases in the presence of a magnetic field. These properties provide the compounds of the MoSe2 family with a high potential for electronics, optoelectronics, and valleytronics (named after the property of electrons called the “valley index”). Tools & research instruments ; Simulation & modelling ; Micro-nanoelectronics Scientific result Tue, 14 Mar 2017 11:00:00 GMT Detecting and Producing a Spin Current in Germanium https://www.cea.fr/drf/english/Pages/News/Scientific-results/2017/detecting-and-producing-a-spin-current-in-germanium.aspx A team from INAC has successfully carried out the conversion of a spin current into a charge current at the interface between iron and germanium, thanks to spin–orbit coupling. According to the reciprocity principle, the reverse process is also possible. This result implies that the generation and detection of a spin current are a priori feasible with current CMOS technology. It constitutes a first step toward a spin transistor relying entirely on spin–orbit coupling. Tools & research instruments ; Micro-nanoelectronics general public ; Journalists ; Researchers Inac Scientific result Wed, 01 Mar 2017 11:00:00 GMT An Optomecanic Mapping of the Magnetic Field https://www.cea.fr/drf/english/Pages/News/Scientific-results/2017/optomecanic-mapping-of-the-magnetic-field.aspx Scientists from INAC have created an original system for mapping magnetic fields at a micronic scale, in a quantitative manner, and in real time. Its principle consists in observing the deformation across a field of thin, magnetic, light-reflecting “nanoribbons”. Micro-nanotechnologies ; Micro-nanoelectronics general public ; Journalists ; Researchers Inac Scientific result Mon, 30 Jan 2017 11:00:00 GMT