In 2020, practically speaking, how long (time-wise) will a qubit function normally before decoherence kicks in?
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asked Feb 12, 2020 at 15:59
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$\begingroup$ according to en.wikipedia.org/wiki/Kane_quantum_computer , phosphorous qubits allegedly have decoherence times on the order of 10**18 years $\endgroup$– Mohammad AtharFeb 12, 2020 at 16:24
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1$\begingroup$ @MohammadAthar: It is acutally $10^{18}$ seconds but it is still very long time. $\endgroup$– Martin VeselyFeb 12, 2020 at 19:14
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2 Answers
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On IBM Q, it is a few tens microseconds. The best value of dephasing time T2 is around 500 microseconds. Have a look here IBM Q website and navigate to "Qubits as physical system" and then to "dephasing T2" to see development of T2 in last twenty years.
answered Feb 12, 2020 at 19:12
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Nuclear moments of europium ions have been experimentally measured to have coherence times of over six hours, although there is no currently known way of performing controlled logic gate operations on them.
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$\begingroup$ I think these construction was intended for quantum RAM and future global quantum communication network. $\endgroup$ Feb 13, 2020 at 11:14