World’s 1st multinode quantum network is a breakthrough for the quantum internetIt is the first time that more than two quantum bits, or “qubits,” that do the calculations in quantum computing have been linked together as “nodes,” or network endpoints. “Right now, all of our nodes are within 10 to 20 meters [32 to 66 feet] of each other,” Pompili said. With all of this done, the middle node entangles its two qubits, causing the qubits of the outer nodes to become entangled. Second, the photons used in the entanglement can’t travel very long distances before they are absorbed or scattered, — destroying the signal being sent between two nodes. Like the bit, the qubit can be either a 1 or a 0, which represent two possible positions in a two-state system. The problem is, unlike classical networks, you cannot amplify quantum signals. When they meet, the two photons also become entangled, thereby entangling the qubits.
Article from Livescience.com.