1. 2 Qubits: Coupled pair of DQD

2. Physical system and effective Hamiltonian Electrostatic coupling between DQD1 and DQD2

3. Computational basis and operators Operators:, Basis: New Basis:

4. with Definitive computational basis

5. General Hamiltonian With

6. Ground State Resonances CROT

7. First Excited State Levels are resonant at values given by and lines.

8. Quantum Logic Operations CROT First order process = a single electron tunnels

9. Quantum Logic Operations SWAP, FLIP 2nd. Order= simultaneous tunneling

10. Experimental steps Initialization at if are controled by gates voltages. coherent evolution time. Independent measurement of each DQD sub-systems

11. Results: coherent oscilations Damped oscilations between |LR> and |RR> (Fig.a) and |LL> and |RL> (Fig.b). Initialization |LR> at |LL> at CROT operations

12. 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

13. Results: coherent oscilations CROT operations t p =0.25ns

14. Results: Second order process Next slide

15. Results: Second order process First order process Numerical Simulations

16. How to prove there is a correlated dynamics?