Decoherence by quantum entanglement (+)+-)|1) H ihtt +|()/|-() +C C|)8()+C|+8|r() (S()=CC(r(o)r() +81()+)8()
Decoherence by quantum entanglement I t( ) + + I t( ) − − ( + + − ) I I t I t ( ) ( ) + + − + − * S t C C I t I t ( ) ( ) ( ) + − + + − = ( ) ( ) ( ) H C C I C I t C I t − + − + − + − + + ⎯⎯→ − + + ( ) H iH t I I t e I ⎯⎯→ −
Decoherence under Dynamical decouling +丌、1 H h>
t t Decoherence under Dynamical decouling H H H H + − − + ⎯⎯→ ⎯⎯→
DD under simulated noise Michael J. Biercuk et al. Nature 458 996(2009) L O=0.5 S(o)-oo Vmax=0.9 V 0.0020.40.6081.0三0b ●cPMG eeaa Full opt △UDD -15 ms Nma=0.9V Stall Tot FP time (ms) o(tHZ Total free precession time(ms) ota free precession time ( ms
DD under simulated noise Michael J. Biercuk et al. Nature 458 996 (2009)
DD in solids: ensemble system JF Du et al. Nature 461 1265(2009) on C-H radical e cHc●o- Hydrogen bond /2 echo UDDi UDD2 UDD3 UDD4 UDD5 UDD6 UDD7 PDD7 number of control pulses After 7 pulses the coherence enhancement is saturated due to the electron-electron spin coupling
J.F Du et al. Nature 461 1265 (2009) DD in solids: ensemble system After 7 pulses, the coherence enhancement is saturated due to the electron-electron spin coupling