Conditional Dynamics of Interacting Quantum Dots
Lucio Robledo,1
Jeroen Elzerman,1
Gregor Jundt,1
Mete Atatüre,2
Alexander Högele,1
Stefan Fält,1
Atac Imamoglu1*
Conditional quantum dynamics, where the quantum state of one
system controls the outcome of measurements on another quantum
system, is at the heart of quantum information processing. We
demonstrate conditional dynamics for two coupled quantum dots,
whereby the probability that one quantum dot makes a transition
to an optically excited state is controlled by the presence
or absence of an optical excitation in the neighboring dot.
Interaction between the dots is mediated by the tunnel coupling
between optically excited states and can be optically gated
by applying a laser field of the right frequency. Our results
represent substantial progress toward realization of an optically
effected controlled–phase gate between two solid-state
qubits.
2 Cavendish Laboratory, University of Cambridge, J. J. Thomson Avenue, Cambridge CB3 0HE, UK.
* To whom correspondence should be addressed. E-mail: imamoglu{at}phys.ethz.ch
