The Knowledge Factory - Sur le même thème https://www.cea.fr/drf/english/Pages/News/Scientific-results/2021/one-entanglement-can-hide-another.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 When the Higgs boson mass allows the Universe to exist https://www.cea.fr/drf/english/Pages/News/Scientific-results/2022/when-the-higgs-boson-mass-allows-the-universe-to-exist.aspx An IPhT physicist and two collaborators have proposed a theoretical model to explain the low mass of the Higgs boson and the cosmological constant – both of which are considered inconsistent with current physics. This model is expected to be tested soon at CERN. Fundamental Research ; Theoretical physics ; Black energy ; Particle physics general public ; Journalists ; Researchers IPhT Découvertes et avancées ; Scientific result Thu, 02 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 Optimizing the acceleration of electrons in the oscillating field of an ultra-high intensity laser pulse https://www.cea.fr/drf/english/Pages/News/Scientific-results/2021/optimizing-the-acceleration-of-electrons-in-the-oscillating-field-of-an-ultra-high-intensity-laser-pulse.aspx Researchers from the LSI (CEA-Iramis) and their partners are showing that it is possible to accelerate electrons more efficiently by laser-plasma interaction, using a progressive rotation of the laser wave front. Laser ; Particle accelerator ; Simulation & modelling general public ; Journalists ; Researchers Iramis Découvertes et avancées ; Scientific result Wed, 08 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 Green chemistry and biofuel: the mechanism of a key photoenzyme decrypted https://www.cea.fr/drf/english/Pages/News/Scientific-results/2021/Green-chemistry-and-biofuel-the-mechanism-of-a-key-photoenzyme-decrypted-.aspx Green Chemistry ; Chemistry ; 3rd generation biofuel ; Microalgae ; Synchrotron ; Laser ; Molecular mechanisms ; Bioenergy Press release Fri, 09 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 Arctic: Where do wet air masses come from in winter? https://www.cea.fr/drf/english/Pages/News/Scientific-results/2021/arctic--where-do-wet-air-masses-come-from-in-winter.aspx Thanks to the first full-length record of the isotopic composition of water vapor from Svalbard (Norway), climatologists at LSCE (CEA-CNRS-UVSQ) documented the origin of winter air masses during peak moisture events. Climate ; Laser general public ; Journalists ; Researchers LSCE Scientific result Thu, 18 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 Modeling the city: an equation that settles a century-old controversy https://www.cea.fr/drf/english/Pages/News/Scientific-results/2021/modeling-the-city-an-equation-that-settles-a-century-old-controversy.aspx Researchers at the IPhT have proposed a new equation describing the evolution of the population of cities that for the first time embraces the observations of economists, geographers and historians. Theoretical physics ; Environment Researchers ; general public ; Journalists IPhT Scientific result Wed, 18 Nov 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 Anisotropic functionalization of gold nanoparticles assisted by surface plasmons https://www.cea.fr/drf/english/Pages/News/Scientific-results/2020/Anisotropic-functionalization-of-gold-nanoparticles-assisted-by-surface-plasmons.aspx Researchers at the CEA-Iramis and their partners have locally grafted organic molecules onto gold nanoparticles, using two photopolymerization steps. This new flexible functionalization technique can be used for applications ranging from biosensing to photonics. Photonics ; Micro-nanotechnologies ; Chemistry ; Laser ; Diagnosis ; Innovation for industry general public ; Journalists ; Researchers Iramis Scientific result Wed, 05 Aug 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 When electrons spin about https://www.cea.fr/drf/english/Pages/News/Scientific-results/2018/When-electrons-spin-about.aspx Many biological or therapeutic molecules cannot be superimposed on their mirror image (and are called chiral). To distinguish these two molecular species (enantiomers), a collaboration involving the Iramis has proposed an original approach using ultra-short circularly polarized laser pulses. This makes it possible to measure the enantiomers, and even to sort them in the future. New technologies ; Laser Researchers ; general public ; Journalists Iramis Scientific result Fri, 02 Mar 2018 11:00:00 GMT A historic discovery that puts an end to many models! https://www.cea.fr/drf/english/Pages/News/Scientific-results/2018/A-historic-discovery-that-puts-an-end-to-many-models.aspx The announcement on October 16, 2017 of the detection of gravitational waves emitted by the collision of two neutron stars is historic for theoretical physicists. The astronomical observations associated with this event demonstrate that gravitational waves move at the speed of light. This observation disqualifies many of the models of “new” physics! Theoretical physics Researchers ; general public ; Journalists IPhT Scientific result Sun, 14 Jan 2018 08:00:00 GMT Plasmons boost the generation of laser harmonics https://www.cea.fr/drf/english/Pages/News/Scientific-results/2017/plasmons-boost-the-generation-of-laser-harmonics.aspx A collaboration involving Iramis has demonstrated the possibility of amplifying the generation of high-order laser harmonics by a factor greater than ten in a zinc oxide (ZnO) semiconductor crystal, by engraving a network of micro-cones on the crystal surface. The gain obtained makes it possible to lower the required infrared power by the same amount. Laser Researchers ; general public ; Journalists Iramis Scientific result Wed, 20 Dec 2017 11:00:00 GMT LASERLAB-EUROPE, a broad-ranging cooperation on ultra-light and short-pulse laser infrastructure https://www.cea.fr/drf/english/Pages/News/Institutional-news/2017/LASERLAB-EUROPE-broad-ranging-cooperation-ultra-light-short-pulse-laser-infrastructure.aspx Within the framework of the LASERLAB-EUROPE project, CEA is working towards sharing and opening up laser and photonics infrastructure to European scientists. Today, Laserlab is an important tool for the development of laser metrology and laser-based instrumentation for a wide range of applications and societal needs in the fields of health, security, environment, etc. Laser ; Photonics ; Micro-nanotechnologies general public ; Journalists ; Researchers Iramis News ; Newsletter ; CEA Research News ; European & international partnerships femtoseconde;attoseconde;ultra-high intensity;metrology;excellent science; Thu, 15 Jun 2017 14:00:00 GMT Ultrahigh Intensity and XUV “Optical Vortices” https://www.cea.fr/drf/english/Pages/News/Scientific-results/2017/ultrahigh-intensity-and-xuv-optical-vortices.aspx For the first time, a team from IRAMIS has produced very intense infrared laser pulses carrying “orbital angular momentum” (optical vortices) and transferred this momentum to XUV harmonics generated on a “plasma mirror.” The applications of these new effects include the acceleration of ultra-short beams of high-energy particles. Laser ; Tools & research instruments Researchers ; general public ; Journalists DRF Scientific result moment angulaire orbital;miroir plasma;Laser à ultra-haute intensité;harmoniques XUV;vortex optique; Mon, 15 May 2017 10:00:00 GMT LHC Rules Out Some Superstring Theory Constructions https://www.cea.fr/drf/english/Pages/News/Scientific-results/2017/lhc-rules-out-some-superstring-theory-constructions.aspx A team of theoretical physicists has demonstrated that, within the framework of the most “simple” solution of string theory, a close relationship binds the masses of fermions and those of their partner particles; i.e., the supersymmetric bosons. Since supersymmetric bosons are absent in the data collected at the LHC, the newly demonstrated constraint most likely rules out this version of string theory. Theoretical physics Researchers ; general public ; Journalists DRF Scientific result fermions;particules;supersymétrie;bosons;branes;Cordes; Thu, 11 May 2017 10:00:00 GMT Neither a Sphere nor a Pyramid: an Ellipsoid! https://www.cea.fr/drf/english/Pages/News/Scientific-results/2017/neither-a-sphere-nor-a-pyramid-an-ellipsoid.aspx An international team led by IRFU and the Japanese research institute RIKEN was able to study the structure of a neutron-rich zirconium nucleus (110Zr)—a first, calling certain models into question. Produced by an accelerator at RIKEN and measured by the MINOS detector, this heavy nucleus proves to be more deformed than expected. Theoretical physics ; Characterisation general public ; Researchers ; Journalists Irfu Scientific result Fri, 03 Feb 2017 11:00:00 GMT DEDALE provides analysis methods to find the right data https://www.cea.fr/drf/english/Pages/News/Institutional-news/2017/DEDALE-provides-analysis-methods-find-right-data.aspx Helping scientists find their way through the data maze, DEDALE project intends to develop the next generation of data analysis methods for the new era of big data in astrophysics and compressed sensing. Astrophysics ; Statistical physics ; Theoretical physics ; Galaxies ; Mathematics general public ; Journalists ; Researchers Irfu News ; Newsletter ; European & international partnerships Data Analytics;High performance computing;Theoretical physics;Statistical physics;data;galaxies;mathematics;mathematical modeling;astrophysics;excellent science; Thu, 02 Feb 2017 11:00:00 GMT