Scientists achieve breakthrough on quantum signaling at room temperature

Good news!

"In brief

• Researchers developed a room-temperature quantum communication device, removing the need for super-cooling and enhancing practical applications.
• The device utilizes twisted light from molybdenum diselenide to entangle photons and electrons, stabilizing quantum states for effective communication.
• Researchers are refining the device to achieve greater quantum performance, aiming to eventually miniaturize quantum systems for embedding in everyday devices.

Present-day quantum computers are big, expensive, and impractical, operating at temperatures near -459 degrees Fahrenheit, or “absolute zero.” In a new paper, however, materials scientists at Stanford University introduce a new nanoscale optical device that works at room temperature to entangle the spin of photons (particles of light) and electrons to achieve quantum communication – an approach that uses the laws of quantum physics to transmit and process data. The technology could usher in a new era of low-cost, low-energy quantum components able to communicate over great distances. ..."

From the abstract:

"Transition metal dichalcogenides possess valley pseudospin, enabling coupling between photon spin and electron spin for classical and quantum information processing. However, rapid valley-dephasing processes have impeded the development of scalable, high-performance valleytronic devices operating at room temperature.

Here we demonstrate that a chiral resonant metasurface can enable room-temperature valley-selective emission in MoSe2 monolayers independent of excitation polarization. This platform provides circular eigen-polarization states with a high quality factor (Q-factor) and strong chiral near-field enhancement. The fabricated Si chiral metasurfaces exhibit chiroptical resonances with Q-factors up to 450 at visible wavelengths.

We reveal degrees of circular polarization (DOP) reaching a record high of 0.5 at room temperature. Our measurements show that the high DOP can be attributed to the significantly increased chiroptical local density of states, which enhances valley-specific radiative transition rates by a factor of ~13. Our work could facilitate the development of ultracompact chiral classical and quantum light sources."

Scientists achieve breakthrough on quantum signaling | Stanford Report "A tiny device that entangles light and electrons without super-cooling could revolutionize quantum tech in cryptography, computing, and AI."

Room-temperature valley-selective emission in Si-MoSe2 heterostructures enabled by high-quality-factor chiroptical cavities (open access sort of)

Room-temperature valley-selective emission in Si-MoSe2 heterostructures enabled by high-quality-factor chiroptical cavities (preprint, open access)

The nanoscale optical device works at room temperature to entangle the spin of photons and electrons to achieve quantum communication.