Have you ever seen Schrodinger’s cat? Probably not, because cats are macroscopic, and quantum effects typically emerge in microscopic objects. Nanostructures provide a toolbox and playground for exploring the interesting, strange, and downright bizarre features of quantum mechanics. We are interested in quantum computing, quantum sensing, and many-body quantum coherence.
Isolated spins in solid state systems can retain their quantum phase coherence for long times, making them attractive qubits. In fact, single spins can be manipulated with gate fidelities far exceeding the threshold for quantum error correction. We seek to build on these advances by investigating sources of decoherence for spins and inventing new ways to entangle and transmit information between distant spins.
For more information, check out Coherent spin state transfer via Heisenberg exchange, Low-frequency charge noise in Si/SiGe quantum dots, Conditional Teleportation of Quantum-Dot Spin States, and Rapid high-fidelity spin state readout in Si/SiGe quantum dots via radio-frequency reflectometry
Many-body quantum coherence
Individual spins in solids can have long coherence times, yet large ensembles of spins, or spin baths, cause decoherence. For example, fluctuating nuclear spins in semiconductors cause dephasing in electron spin qubits. What happens to the coherence of individual spins in large ensembles remains an important question both for quantum information processing and the foundations of quantum mechanics. We are interested in investigating the dynamics of many-body quantum coherence in spin ensembles.
For more information, check out Stabilization and manipulation of multi-spin states in quantum dot time crystals with Heisenberg Interactions, Coherent multi-spin exchange in a quantum-dot spin chain.