Princeton physicists have overcome the limitations of silicon quantum chips

During the experiment, scientists transmitted information between qubits, which were at a distance of about five millimeters from each other.

A team of researchers from Princeton was able to show the possibility of the interaction of two spin qubits located at a great distance from each other.  For the first time, it was possible to do it on silicon chips: when before this was considered impossible. 

Silicon spin qubits have several advantages over superconducting qubits. They are able to maintain a quantum state for longer, and their production is much cheaper.  Their main disadvantage is they are very small in size due to the fact that they consist of individual electrons.

The team of scientists managed to solve the problem of the interconnection of qubits by creating a special ‘transmitter’ consisting of a narrow cavity with one photon, which transmitted the signal between the qubits. 

As a result, the researchers managed to transfer information between qubits, which were at a distance of about five millimeters from each other.