Stanford University researchers say they have developed a nanoscale optical device that could shift the direction of quantum communication.<\/p>\n
Unlike today\u2019s quantum computers that operate near absolute zero, this new approach works at room temperature. <\/p>\n
The device entangles the spin of photons and electrons, which is essential for transmitting and processing quantum information.<\/p>\n
\u201cThe material in question is not really new, but the way we use it is,\u201d says Jennifer Dionne, professor of materials science and engineering and senior author of the paper.<\/p>\n
\u201cIt provides a very versatile, stable spin connection between electrons and photons that is the theoretical basis of quantum communication.\u201d<\/p>\n
She notes that electrons typically lose their spin too quickly for reliable use.<\/p>\n
Twisted light and quantum spin<\/p>\n
The device combines a patterned layer of molybdenum diselenide placed on a nanopatterned silicon chip. <\/p>\n
The material belongs to a class known as transition metal dichalcogenides, which are known for their strong optical responses.<\/p>\n
\u201cThe Silicon nanostructures enable what we call \u2018twisted light,\u201d says Feng Pan, a postdoctoral scholar and the study\u2019s first author.<\/p>\n
\u201cThe photons spin in a corkscrew fashion, but more importantly, we can use these spinning photons to impart spin on electrons that are the heart of quantum computing.\u201d<\/p>\n
Dionne explains that the patterns created on the chip are extremely small.<\/p>\n
\u201cThe patterned nanostructures are imperceptible to the human eye, about the size of the wavelength of visible light,\u201d she says.<\/p>\n
Pan adds that this twisted light can entangle with electron spins to create qubits, which serve as the building blocks of quantum communication.<\/p>\n
The spin of a qubit functions much like the zeros and ones in traditional computing, but with far more complexity.<\/p>\n
Smaller and more practical<\/p>\n
Traditional quantum systems must remain extremely cold to avoid decoherence, which causes qubits to lose their quantum behavior.<\/p>\n
That requirement makes existing systems large, expensive, and limited to specialized laboratories. <\/p>\n
The Stanford researchers believe their design moves the field closer to practical and accessible quantum technology.<\/p>\n
Room-temperature operation reduces cost and complexity. The researchers say this could eventually drive applications in secure communications, artificial intelligence, advanced sensing, and computing.<\/p>\n
Pan says the functional pairing of TMDC materials and silicon was a key factor. \u201cIt all comes down to this material and our Silicon<\/a> chip,\u201d he says.<\/p>\n \u201cTogether, they efficiently confine and enhance the twisting of light to create a strong coupling of spin between photons and electrons.\u201d<\/p>\n Dionne and Pan are now working to improve the device and are testing other material combinations that may offer stronger performance.<\/p>\n They are also studying how the platform could connect to larger quantum systems. <\/p>\n That transition will require new light sources, detectors, interconnects, and other supporting hardware.<\/p>\n \u201cIf we can do that, maybe someday we could do quantum<\/a> computing in a cell phone,\u201d Pan says. \u201cBut that\u2019s a 10-plus-year plan.\u201d<\/p>\n