Spin Qubits and more in a Triple Quantum Dot Circuit - Andrew Sachrajda

We have developed few electron triple quantum dot devices which are suitable for quantum information applications. In this talk I will review our recent experiments in these devices. The talk will describe (i) some novel properties that a triple quantum dot system posesses such as bipolar spin blockade where spin can be evoked to transform the device into an insulator (‘spinsulator’), (2) Quantum backaction where we show that sound waves generated incidentally in the device by our measurement technique can be ‘heard’ by our qubits by a process that involves a quantum interference phenomena and (3) coherent manipulation of our qubit states. The talk will carefully describe the measurement techniques used in such investigations developed by several groups over the last decade.