Quantum

Credit: Vexlum
Vexlum’s CEO Jussi-Pekka Penttinen (left) and Stefan Truppe, managing director of the company’s new U.K. R&D lab.
Vexlum’s CEO and Cofounder Jussi-Pekka Penttinen shares how the Finnish company differentiates itself, why they’re expanding operations into the U.K., and three intriguing trends...
Aug. 5, 2026
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Aug. 3, 2026
Credit: Marcus Albrechtsen/Niels Bohr Institute
Illustration of the telecom single-photon device. A resonant pulsed laser (top left) excites a single quantum dot embedded within a photonic-crystal waveguide, and the dot emits telecom-wavelength photons one at a time into the on-chip circuit. Gold contacts apply the bias that stabilizes the dot's charge environment.
Aug. 3, 2026
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Following the Photons: A Photonics Podcast
July 28, 2026
Credit: MPL
This shot shows the group’s highly broadband and bright optical parametric amplifier in action.
July 27, 2026
Credit: Yiming Gong
Schematic comparison of carrier injection through a) 1 + 2 and b) 2 + 3 quantum interference within a semiconductor. The higher-order 2 + 3 process concentrates carriers into a narrower range of momentum-space directions and produces a more directional photocurrent.
July 20, 2026
The different architectures of quantum computers.
July 17, 2026
Credit: Thomas Walker
To build a quantum sensor, light must be prepared in a carefully controlled state where its frequency, polarization, and intensity are well controlled. The polarization of blue light is altered before it’s used to cool the atoms to near absolute zero.
July 16, 2026
FIGURE 1. Top: An OFC generated by a modelocked laser. Bottom: A periodic pulse train in the time domain corresponds to a series of discrete frequencies in the frequency domain. The frequency comb is shifted in frequency space by a carrier-envelope offset frequency fceo, which arises from the carrier envelope phase slip Δφ between successive pulses. Apart from this offset, the comb consists of equally spaced spectral lines separated by the repetition rate frep.
July 1, 2026

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