= Fei Wang
{disambiguate=dynamical decoupling}
{c}
= F. Wang
{disambiguate=dynamical decoupling}
{c}
{synonym}
<Fei Wang (dynamical decoupling)> is the first author, printed as F. Wang, of the 2016 experimental study of robust <dynamical decoupling> with finite-strength control pulses. The corresponding 2017 APS abstract identifies Fei Wang and the same five coauthors under the same research title.<Experimental realization of robust dynamical decoupling with bounded controls in a solid-state spin system by Fei Wang and others (APS March Meeting 2017)>[Abstract Y37b.00005, author list]{ref}
The experiment controlled an electron-spin <qubit> at a <nitrogen-vacancy center> in <diamond>. A $532\,\mathrm{nm}$ <laser> initialized and read out the center through <fluorescence>; a transmission line delivered <microwave> control and deliberately injected noise. Comparing pulse sequences tested whether slow, finite-duration pulses could suppress <dephasing> and relaxation noise, rather than requiring ideal instantaneous rotations. The study found that appropriately arranged slow pulses could approach the performance of strong fast pulses.<Experimental realization of robust dynamical decoupling with bounded controls in a solid-state spin system by F. Wang and others>[Introduction, results figure 1 and Appendix, Experimental Setup]{ref}
An original pulse-area example explains the constraint. For resonant control $H_c=\hbar\Omega\sigma_x/2$, a constant pulse of duration $t_p$ rotates through $\Omega t_p$. A $\pi$ pulse with $\Omega=2\pi\times100\,\mathrm{kHz}$ lasts $5\,\mathrm{\mu s}$; at $\Omega=2\pi\times10\,\mathrm{kHz}$ it lasts $50\,\mathrm{\mu s}$. Both have the same rotation angle, but the system experiences noise for ten times longer during the second pulse. The demonstrated sequence design addresses that finite-duration problem; pulse area alone does not establish noise cancellation.
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