Fig. 1
From: Spin decoherence in a two-qubit CPHASE gate: the critical role of tunneling noise
Schematic energy diagrams. a Energy diagram of singlet states for two electrons in a DQD. Detuning \(\epsilon = \epsilon _0 + \hat n_\epsilon\) and tunneling \(t = t_0 + \hat n_t\) are indicated, in which \(\hat n_\epsilon\) \(\left( {\hat n_t} \right)\) is detuning (tunneling) fluctuation from charge noise. b The energy diagram of control-qubit (CQ) states, two-qubit (2Q) states without exchange interaction (i.e. t0 = 0), and two-qubit eigenstates with exchange interaction J
