A staff of researchers have developed a brand new technique for characterising quantum properties of huge programs utilizing graph principle
Describing the non-classical properties of a fancy many-body system (corresponding to entanglement or coherence) is a crucial a part of quantum applied sciences.
A super instrument for this activity would work nicely with massive programs, be simply computable and simply measurable. Sadly, such a instrument for each scenario doesn’t but exist.
With this purpose in thoughts a staff of researchers – Marcin Płodzień and Maciej Lewenstein (ICFO, Barcelona, Spain) and Jan Chwedeńczuk (College of Warsaw, Poland) – started work on a particular kind of quantum state utilized in quantum computing – graph states.
These states will be visualised as graphs or networks the place every vertex represents a qubit, and every edge represents an interplay between pairs of qubits.
The staff studied 4 totally different shapes of graph states utilizing new mathematical instruments they developed. They discovered that one in every of these specifically, the Turán graph, may very well be very helpful in quantum metrology.
Their technique is (comparatively) easy and doesn’t require many assumptions. Because of this it may very well be utilized to any form of graph past the 4 studied right here.
The outcomes might be helpful in varied quantum applied sciences wherever exact data of many-body quantum correlations is important.
