Topic
Quantum optics research, explained
9 open-access quantum optics studies, each with a flashcard deck and a quiz.
- Can a flat nanostructured surface entangle photons?
A single flat silicon metasurface can entangle pairs of photons into a shared path state and then disentangle them again while keeping their quantum phase intact.
- Can a single photon's twisted light survive a colour change?
Single photons carrying twisted-light orbital angular momentum were shifted from telecom infrared to green light while keeping their spatial shape, quantum correlations and superposition coherence.
- Can a chip change the colour of single photons without loss?
An on-chip lithium niobate modulator shifted single photons' frequency by up to about 641 GHz and squeezed their bandwidth 18-fold, without adding noticeable loss or noise.
- Can cheap quantum-dot films detect very long-wave infrared?
Large mercury telluride quantum dots, with tuned surface chemistry, made solution-processed detectors that respond to infrared light out to 18 micrometres.
- Can a laser write single-atom-scale light sources?
Firing laser pulses just above a carefully measured damage threshold made defects smaller than 5 nm in boron nitride, and nearly every spot became a single, bright, stable source of individual photons.
- Can voltage make a single quantum dot emit photons faster?
Pumping extra electrons into a single quantum dot with a voltage made it emit light up to about 210 times faster while it still emitted photons one at a time.
- Can single photons from a quantum dot secure a link between cities?
A quantum dot that emits one photon at a time in the telecom band produced secure keys between two cities with a very low error rate for more than a day.
- Can a strain-tuned quantum dot make an ideal single-photon source?
A quantum dot built into a tiny curved-mirror cavity on a piezoelectric base can be squeezed into resonance and then emits bright, nearly perfect single photons.
- Can entangled-photon twins sharpen see-through phase images?
Using the noise of a twin photon beam to cancel shot noise lets phase images of transparent objects be retrieved with up to about 40% less uncertainty than the best classical equivalent.