Research

My research interests are in the areas of atomic physics, quantum control, and quantum information processing, more specifically the characterization and control of open quantum systems. My thesis research focuses on developing novel control protocols to characterize the dynamics of single electron spins in diamond interacting with their classical and quantum environment. I am also very interested in contributing to the recent theoretical developments in non-equilibrium statistical mechanics and quantum thermodynamics.

1. Coherent manipulation and readout of an ensemble of electronic spins
My current project aims at studying the dynamics of small ensembles of electronic spins, which are an important source of noise for quantum systems in the solid state. I aim at converting these spins into useful resources for processing quantum information and sensing weak magnetic fields. Towards that goal, I study the dynamics of individual nitrogen-vacancy centers in diamond interacting with few nearby electronic spins. I implement magnetic double-resonance sequences to characterize the dynamics of the spin ensemble and develop protocols for the efficient transfer, storage, and readout of spin polarization. These techniques shall be useful for achieving electron-mediated quantum sensing and polarization transfer to remote nuclear spins.

2. Time-resolved magnetic sensing with electronic spins in diamond
My previous projects focused on the problem of estimating the parameters responsible for the dynamics of an isolated quantum system in the presence of external time-varying fields. My colleagues and I introduced and experimentally demonstrated a coherent acquisition method to accurately reconstruct the temporal profile of time-varying fields using Walsh sequences. These decoupling sequences act as digital filters that efficiently extract spectral information while suppressing decoherence. We showed that the Walsh reconstruction method provide a significant gain in sensitivity over existing strategies, which can be further improved by applying ideas from data compression and compressed sensing. These results can be directly applied to perform time-resolved magnetic sensing with quantum probes at the nanometre scale, e.g., to measure neuronal fields with nitrogen-vacancy centers in diamond. I am now working on extending this protocol to estimate the spectral properties of stochastic fields.

You can learn more about these ideas by watching the videorecording of my presentation at the NSE Graduate Expo 2015 at MIT.