Researchers from the Swiss Federal Institute of Technology Lausanne, or EPFL, Purdue University, and the U.S. Department of Energy’s Oak Ridge National Laboratory recently completed the characterization of an entangled pair of eight-level qudits that formed a 64-dimensional quantum space, quadrupling the previous record for discrete frequency modes. Their findings were recently published in the journal Nature Communications. “We’ve always known that it’s possible to encode 10- or 20-level qudits or even higher using the colors of photons, or optical frequencies, but the problem is that measuring these particles is very difficult,” said Hsuan-Hao Lu, a postdoctoral research associate at ORNL. “That’s the value of this paper — we found an efficient and novel technique that is relatively easy to do on the experimental side.”
Source: New Measurements Provide a Glimpse of the Quantum Future
