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Lots of oxygen existed in the early universe as JWST spectrograph reveals that life may have emerged earlier than previously thought.
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A novel titanium alloy can create load-bearing implants with inherent antibacterial response - enabling safer orthopaedic implant surgeries.
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🤔 What volcanoes and coffeemaking have in common, the physics of playing the didjeridu.
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In physics, the Rabi cycle (or Rabi flop) is the cyclic behaviour of a two-level quantum system in the presence of an oscillatory driving field. A great variety of physical processes belonging to the areas of quantum computing, condensed matter, atomic and molecular physics, and nuclear and particle physics can be conveniently studied in terms of two-level quantum mechanical systems, and exhibit Rabi flopping when coupled to an optical driving field. The effect is important in quantum optics, magnetic resonance and quantum computing, and is named after Isidor Isaac Rabi.
A two-level system is one that has two possible energy levels. These two levels are a ground state with lower energy and an excited state with higher energy. If the energy levels are not degenerate (i.e. not having equal energies), the system can absorb a quantum of energy and transition from the ground state to the "excited" state. When an atom (or some other two-level system) is illuminated by a coherent beam of photons, it will cyclically absorb photons and re-emit them by stimulated emission. One such cycle is called a Rabi cycle, and the inverse of its duration is the Rabi frequency of the system. The effect can be modeled using the Jaynes–Cummings model and the Bloch vector formalism.
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A two-level system is one that has two possible energy levels. These two levels are a ground state with lower energy and an excited state with higher energy. If the energy levels are not degenerate (i.e. not having equal energies), the system can absorb a quantum of energy and transition from the ground state to the "excited" state. When an atom (or some other two-level system) is illuminated by a coherent beam of photons, it will cyclically absorb photons and re-emit them by stimulated emission. One such cycle is called a Rabi cycle, and the inverse of its duration is the Rabi frequency of the system. The effect can be modeled using the Jaynes–Cummings model and the Bloch vector formalism.
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Stratospheric effect boosts global warming as carbon dioxide levels rise.
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Strange metal is quiet when it comes to shot noise. New measurements suggest that quasiparticles don't carry current in strange metals.
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Next-gen atomic clocks run at optical frequencies. The best of them can remain precise to within a second after 50 billion years. And soon, for the first time, you’ll be able to buy one of your very own.
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💧 Water droplets move faster down bundles of fibres than down individual fibres – even when the total perimeter of the two structures is identical.
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If you stack five layers of graphene together, it becomes multiferroic, exhibiting both unconventional magnetism and an exotic electronic behaviour dubbed “ferro-valleytricity”. These properties could be exploited in graphene information-storage devices.
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Speakers at Acoustics 2023 Sydney shared the latest innovations in ultrasound technologies, including pain-free vaccination and monitoring muscle dynamics in real time.
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