To cor­rect these errors, a quan­tum error cor­rec­tion (QEC) sys­tem will be essen­tial.
To cor­rect these errors, a quan­tum error cor­rec­tion (QEC) sys­tem will be essen­tial. This gen­er­al­ly involves encod­ing a bit of quan­tum infor­ma­tion onto a set of qubits that act togeth­er as a sin­gle “log­i­cal qubit”. One such tech­nique is sur­face cod­ing, in which a quan­tum infor­ma­tion bit is encod­ed onto an array of qubits. A prob­lem with this approach, how­ev­er, is that adding extra qubits to the sys­tem in turn adds extra sources of error.