Fig. 5: Bell state lifetime.
From: Bell inequality violation in gate-defined quantum dots
a Protocol for conducting (I) Ramsey and (II) Hahn echo experiments on maximally entangled Bell states. The density matrix is measured by quantum state tomography. b Bell signal S as a function of wait time τwait after preparation of the four maximally entangled Bell states at T = 0.1 K. c Bell signal S of the four maximally entangled Bell states as a function of a total wait time τwait being equally separated by a single, consecutive refocusing π pulse on Q1 and Q2 at 0.1 K. The Q1 and Q2 single qubit coherence times are indicated by the blue and red dashed lines, respectively. Error bars represent the 95% confidence level.
