# How long can a qubit exist without decoherence?

In 2020, practically speaking, how long (time-wise) will a qubit function normally before decoherence kicks in?

• according to en.wikipedia.org/wiki/Kane_quantum_computer , phosphorous qubits allegedly have decoherence times on the order of 10**18 years Feb 12 '20 at 16:24
• @MohammadAthar: It is acutally $10^{18}$ seconds but it is still very long time. Feb 12 '20 at 19:14