Quantum computing tagged posts

Quantum internet leaves the lab with first real-world entanglement over busy telecom fiber

Quantum internet leaves the lab
Entangled photons are distributed over 24.4 km of deployed fiber from Evanston to Chicago. One of the photons is wavelength division multiplexed to propagate with a state-of-the-art classical communications system and optical synchronization clock. BW, bandwidth; EPPS, entangled photon pair source; MUX, wavelength-division multiplexer; OLS Tx (Rx), classical optical line system transmitter (receiver); SNSPD, superconducting nanowire single photon detector; TDC, time-to-digital converter; WR, White Rabbit synchronizer. Credit: Optica Quantum (2026). DOI: 10.1364/opticaq.592786

Quantum information is notoriously fragile. Internet traffic is anything but. Yet Northwestern University scientists have demonstrated they can peacefully coexist inside the same fiber-optic cable.

In a new...

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Back to the future: Is light-speed analog computing on the horizon?

Back to the future: Is light-speed analog computing on the horizon?
Fabricated unitary universal device and its power-divider layer. Credit: UTS / Dr Rasool Keshavarz

Scientists have achieved a breakthrough in analog computing, developing a programmable electronic circuit that harnesses the properties of high-frequency electromagnetic waves to perform complex parallel processing at light-speed.

The discovery points to a new era of computing that operates far beyond the limits of conventional digital electronics, using less energy, while performing massive calculations.

The study, “Programmable circuits for analog matrix computations,” has been published in Nature Communications.

The research was led by Dr...

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Clearing significant hurdle to quantum computing

Harvard physicists working to develop game-changing tech demonstrate 3,000 quantum-bit system capable of continuous operation

One often-repeated example illustrates the mind-boggling potential of quantum computing: A machine with 300 quantum bits could simultaneously store more information than the number of particles in the known universe.

Now process this: Harvard scientists just unveiled a system that was 10 times bigger and the first quantum machine able to operate continuously without restarting.

In a paper published in the journal Nature, the team demonstrated a system of more than 3,000 quantum bits (or qubits) that could run for more than two hours, surmounting a series of technical challenges and representing a significant step toward building the super computers, wh...

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‘Nanodot’ control could fine-tune light for sharper displays, quantum computing

Illustration of light emission from a molybdenum diselenide nanodot embedded in tungsten diselenide.
On the left is an illustration of the experimental setup from this study. Molybdenum diselenide nanodots, represented by red triangles, are embedded in tungsten diselenide and encapsulated by hexagonal boron nitride (hBN) on top and bottom. A focused electron beam, shown in green, in a scanning transmission electron microscope (STEM) is aimed at the structure. The emitted light is collected to generate an intensity map. On the upper right is a dark-field STEM image of the molybdenum diselenide nanodot embedded inside tungsten diselenide. The contour of the nanodot is marked by dotted green lines. On the lower right is an artificially colored light emission intensity map of the same region, with the localized emission from the nanodot clearly visible. Credit: Provided by the researchers...
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