2 Qubits: Coupled pair of DQD Physical system and effective Hamiltonian Electrostatic coupling between DQD1 and DQD2 Computational basis and operators Operators:, Basis: New Basis: with Definitive computational basis General Hamiltonian With Ground State Resonances CROT First Excited State Levels are resonant at values given by and lines. Quantum Logic Operations CROT First order process = a single electron tunnels Quantum Logic Operations SWAP, FLIP 2nd. Order= simultaneous tunneling Experimental steps Initialization at if are controled by gates voltages. coherent evolution time. Independent measurement of each DQD sub-systems Results: coherent oscilations Damped oscilations between |LR> and |RR> (Fig.a) and |LL> and |RL> (Fig.b). Initialization |LR> at |LL> at CROT operations Results: coherent oscilations Damped oscilations between |LR> and |RR> (Fig.a) and |LL> and |RL> (Fig.b). Initialization |LR> at |LL> at CROT operations t p =0.25ns Results: coherent oscilations CROT operations t p =0.25ns Results: Second order process Next slide Results: Second order process First order process Numerical Simulations How to prove there is a correlated dynamics?