Researchers demonstrate a new quantum memory device that will enable faraway nodes in a network to coordinate in time, a key ingredient for a future quantum Internet.
Category: quantum physics – Page 13
Circular Rydberg atoms set three records, staying stable for 11 milliseconds
Rydberg atoms are considered promising building blocks for quantum computers and their precursors, quantum simulators. Researchers at the 5th Institute of Physics of the University of Stuttgart have achieved record values for the lifetime, size, and storage time of circular Rydberg atoms, a special form of Rydberg atom in which electrons move in a stable circular orbit around the nucleus. The findings were published in Nature Communications.
Quantum simulators replicate quantum systems for research purposes and are the precursors to future quantum computers. “One major challenge in developing high-performance quantum simulators was that Rydberg atoms are highly sensitive and remain stable for only a short time. We overcame this challenge and increased the stability of the atoms by a factor of 20,” says Professor Dr. Tilman Pfau, head of the 5th Institute of Physics.
Rydberg atoms are important building blocks for neutral-atom quantum technologies, which use neutral (i.e., uncharged) atoms that can be trapped and controlled with laser light. They are several thousand times larger than ordinary atoms and can therefore interact with one another over unusually long distances of about 5 µm. Although this is only about one-tenth the thickness of a human hair, it is a huge distance in the tiny world of atoms.
Harvard Scientists Use Tiny Sound Waves To Protect Quantum Information
The same tiny vibrations that carry quantum information across a chip could also keep that information from fading away.
Quantum technologies face a persistent problem: qubits are extraordinarily sensitive to disturbances from their surroundings. Researchers at the Harvard John A. Paulson School of Engineering and Applied Sciences (SEAS) have now protected a qubit using mechanical vibrations, essentially sound waves at the quantum scale.
The advance came from the laboratory of Marko Lončar, Tiantsai Lin Professor of Electrical Engineering. It could help make quantum networks smaller, reduce interference between components, and connect different kinds of qubits within a single hybrid system.
Researchers Turned “Empty Space” Into a Tool for Superconductivity
Researchers used a specially designed cavity to strengthen quantum vacuum fluctuations and enhance superconductivity in a thin material.
Empty space is not truly empty. Even a vacuum contains restless quantum fluctuations, and researchers have now shown for the first time that these normally subtle effects can be engineered to strengthen superconductivity.
The work, led by Changgan Zeng and Guanghui Cheng of the University of Science and Technology of China of the Chinese Academy of Sciences, with Qingdong Jiang of Shanghai Jiao Tong University, Frank Wilczek of the Massachusetts Institute of Technology, and other collaborators, was published in Nature.
Schrödinger’s blunder created the quantum measurement problem
Quantum mechanics is seen as challenging the idea that science provides objective descriptions of reality outside of our minds. The “measurement problem” seems to suggest that the act of observation creates the outcome that is observed. But physicist Antony Valentini, whose Beyond the Quantum was hailed by Lee Smolin as “the best book written this century” on quantum mechanics, argues that this picture rests on an enormous blunder by Erwin Schrödinger. After Louis de Broglie predicted the wave-like trajectories of particles, Schrödinger found the equation describing this. But whereas de Broglie envisaged particles riding on waves, Schrödinger kept the waves and threw away the particles. That single decision birthed the measurement problem—and it was completely unnecessary. Resurrect de Broglie’s original particle-based theory, Valentini argues, and we can dispel quantum mystery.
Antony Valentini will debate Sabine Hossenfelder and Philip Ball live at HowTheLightGetsIn Festival on September 19th, alongside hundreds of other debates, talks, music and comedy. Book your place now.
Reality and the quantum.
Scientists Just Teleported an Image Across 100 Quantum Channels at Once
Quantum teleportation is poised to change the world.
It sounds like science fiction – that the quantum state of one system can be transferred, or ‘teleported’, to another system a great distance away at close to the speed of light.
It’s real, and it has been proven – at relatively small scales. But if quantum computers are ever going to communicate across large networks, they’re going to need a way to send a lot of quantum information at once – which means scaling it up.
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