Assistant Professor, Department of Nuclear Science and Engineering, MIT
Paola Cappellaro is an Assistant Professor in the Nuclear Science and
Engineering Department at MIT, where she is also affiliated with the
Research Laboratory of Electronics.
Before joining MIT, she was a postdoctoral fellow at the Institute for
Theoretical Atomic, Molecular and Optical Physics at Harvard
University. Her research group, the Quantum Engineering Group, is
exploring the dynamics and coherent control of electronic and nuclear
spins, using techniques from magnetic resonance and quantum optics.
Spin chains have been proposed as quantum wires in many quantum-information processing architectures. Coherent transmission of quantum information over short distances is enabled by internal couplings among spins in the chain. Given the practical challenge of preparing the chain in a pure state, we propose to use a chain that is initially in the maximally mixed state. In this talk, I will show how similarities between the transport properties of pure and mixed-state chains enable protocols for the perfect transfer of quantum information and entanglement in mixed-state chains. Remarkably, mixed-state chains allow the use of a broader class of Hamiltonians, which are more readily obtainable from the naturally occurring magnetic dipolar interaction. I will conclude discussing how these results open the possibility of experimental implementations using defect centers in diamond.