Single qubit coherence time record

[Dragonfall]

Is it possible yet to store a single qubit for an extended period of time? If I only care about storing a BB84 state, is it possible to take (say) 128 of these single qubit storages? They're not entangled and I don't need to send them through any general quantum circuitry.

 

[Strilanc]

Storing unentangled qubits is just as hard as storing entangled qubits. You won't be able to store 128 of them anytime soon. Not for more than a tiny fraction of a second, anyways.

Give it another year or five.