Contact: Patrice Bertet, patrice.bertet@cea.fr, +33 1 69 08 55 29 |
Summary: |
Full description: Spins in solids are ideal candidates for implementing such a quantum computer, because they are natural two-level systems with a very long coherence time (that can reach one second, or even one hour in certain cases) when embedded in a very pure crystalline matrix. The biggest challenge, unsolved for now on, is to couple several of these spin qubits in order to realize non-trivial quantum logic operations. In the framework of an ERC project, we are exploring an ambitious idea, which consists in coupling each spin to a superconducting circuit that would then mediate the interaction between distant spins. The first step consists in coupling one superconducting circuit called the “flux-qubit” [1] to a single spin, implemented by a NV center in diamond. For that the flux-qubit circuit will be fabricated directly on top of an ultra-pure diamond crystal, made out of isotopically-enriched Carbon 12 material, in which a NV center has been located with nanometric precision. [1] Stern, M. et al., Phys. Rev. Lett. 113, 123601 (2014) |
Experimental Techniques : clean-room techniques (optical and e-beam lithography, fabrication of tunnel junctions, all available in-house), optical detection and characterization of individual NV centers (confocal microscope), low-temperature cryogenics (20mK), ultra-low-noise microwave measurements