Map showing path of two-node quantum network through Cambridge and Boston, Massachusetts. Credit: Can Knaut via OpenStreetMapImagining a quantum internet capable of transmitting hacker-proof information globally through photons superimposed in different quantum states is one thing; demonstrating its feasibility in the real world is quite another.
The Harvard team established the practical makings of the first quantum internet by entangling two quantum memory nodes separated by an optical fiber link deployed over a roughly 22-mile loop through Cambridge, Somerville, Watertown, and Boston. The two nodes were located a floor apart in Harvard’s Laboratory for Integrated Science and Engineering.have been created in the past, the Harvard team’s is the longest fiber network between devices that can store, process and move information.
The silicon-vacancy center contains two qubits, or bits of quantum information: one in the form of an electron spin used for communication, and the other in a longer-lived nuclear spin used as a memory qubit to store entanglement . Both spins are fully controllable with microwave pulses. These diamond devices – just a few millimeters square – are housed inside dilution refrigeration units that reach temperatures of -459at Harvard.
“Showing that quantum network nodes can be entangled in the real-world environment of a very busy urban area, is an important step towards practical networking between quantum computers,” Lukin said.
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