A single spin is the smallest possible magnetic field sensor, providing the ultimate limit in spatial resolution. Devices comprising one single spin or a few spins provide a revolutionary tool to study magnetic fields at the nanoscale. For example, they could be used to detect nanoscale magnetic fields in nano-electronic devices, biological molecules and complex materials.
Single spins are also excellent systems to store and process information at the quantum level, providing communication and computing capabilities beyond what is possible in the classical world.
Our goal is to individually control single electronic and nuclear spins associated to point defects in solid-state materials, such as silicon carbide and diamond. Such defects effectively behave as single atoms trapped in a solid matrix: they are optically active and the associated electronic spin can be controlled and measured with high precision by a combination of optical and radio-frequency pulses. By working at the interface of quantum optics, magnetic resonance, materials science and nanophotonics, we will develop quantum opto-electronic devices based on single spins for applications in quantum sensing and information processing.
C. Bonato, M. S. Blok, H. T. Dinani, D. W. Berry, M. Markham, D. Twitchen and R. Hanson. Optimized quantum sensing with a single electron spin using real-time adaptive measurements. Nature Nanotechnology 11, 247-252 (2016)
M. S. Blok, C. Bonato, M. Markham, D. Twitchen, V. S. Dobrovitski, and R. Hanson. Manipulating a qubit through the backaction of sequential partial measurements and real-time feedback. Nature Physics 10, 189–193 (2014)
J. N. Hagemeier, C. Bonato, T.-A. Truong, H. Kim, G. J. Beirne, M. Bakker, M. P. van Exter, Y. Luo, P. M. Petroff, and D. Bouwmeester. H1 photonic crystal cavities for hybrid quantum information protocols. Optics Express 20, 24714–24726 (2012)
C. Bonato, F. Haupt, S. S. R. Oemrawsingh, J. Gudat, D. Ding, M. P. Van Exter, and D. Bouwmeester. CNOT and Bell-state analysis in the weak-coupling cavity QED regime. Physical Review Letters 104, 160503 (2010)
C. Bonato, A. V. Sergienko, B. E. A. Saleh, S. Bonora, and P. Villoresi. Even-order aberration cancellation in quantum interferometry. Physical Review Letters 101, 233603 (2008)
P. Villoresi, T. Jennewein, F. Tamburini, M. Aspelmeyer, C. Bonato, R. Ursin, C. Pernechele, V. Luceri, G. Bianco, and A. Zeilinger. Experimental verification of the feasibility of a quantum channel between space and earth. New Journal of Physics 10, 033038 (2008)
Cristian studied physics at the University of Padova (“Laurea” degree, 2004 – PhD, 2008). In Padova, he worked with Prof. Paolo Villoresi on experiments leading to the first demonstration of single photon exchange between an orbiting satellite and a ground-based optical station. During his PhD, he spent two years at Boston University, in the lab of Prof. Alexander Sergienko, studying the spatial properties of photonic entangled states.
After his PhD, his research interests shifted towards quantum optics in solid-state systems, in particular on the interaction between single spins and photons. He moved to the Netherlands for two post-doctoral positions, one in Leiden with Prof. Dirk Boumeester on cavity quantum electrodynamics with self-assembled quantum dots and one in Delft with Prof. Ronald Hanson on single spins associated with defects in diamond.
Currently, Cristian is Assistant Professor at Heriot Watt University.