Experimental deterministic correction of qubit loss [1]

The successful operation of quantum computers relies on protecting qubits from decoherence and noise, which - if uncorrectet - will lead to erroneous results. Because these errors accumulate during an algorithm, correcting them becomes a key requirement for large-scale and fault-tolerant quantum information processors. Besides computational errors, which can be addressed by quantum error correction [2] – [8] , the carrier of the information can also be completely lost or the information can leak out of the computational space [9] – [13] .