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Author: Il’ichev, E. ×

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    How to test the “quantumness” of a quantum computer?
    (Lausanne : Frontiers Research Foundation, 2014) Zagoskin, A.M.; Il’ichev, E.; Grajcar, M.; Betouras, J.J.; Nori, F.
    Recent devices, using hundreds of superconducting quantum bits, claim to perform quantum computing. However, it is not an easy task to determine and quantify the degree of quantum coherence and control used by these devices. Namely, it is a difficult task to know with certainty whether or not a given device (e.g., the D-Wave One or D-Wave Two) is a quantum computer. Such a verification of quantum computing would be more accessible if we already had some kind of working quantum computer, to be able to compare the outputs of these various computing devices. Moreover, the verification process itself could strongly depend on whether the tested device is a standard (gate-based) or, e.g., an adiabatic quantum computer. Here we do not propose a technical solution to this quantum-computing “verification problem,” but rather outline the problem in a way which would help both specialists and non-experts to see the scale of this difficult task, and indicate some possible paths toward its solution.
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    Experimental system design for the integration of trapped-ion and superconducting qubit systems
    (Dordrecht : Springer Science + Business Media B.V., 2016) De Motte, D.; Grounds, A.R.; Rehák, M.; Rodriguez Blanco, A.; Lekitsch, B.; Giri, G.S.; Neilinger, P.; Oelsner, G.; Il’ichev, E.; Grajcar, M.; Hensinger, W.K.
    We present a design for the experimental integration of ion trapping and superconducting qubit systems as a step towards the realization of a quantum hybrid system. The scheme addresses two key difficulties in realizing such a system: a combined microfabricated ion trap and superconducting qubit architecture, and the experimental infrastructure to facilitate both technologies. Developing upon work by Kielpinski et al. (Phys Rev Lett 108(13):130504, 2012. doi:10.1103/PhysRevLett.108.130504), we describe the design, simulation and fabrication process for a microfabricated ion trap capable of coupling an ion to a superconducting microwave LC circuit with a coupling strength in the tens of kHz. We also describe existing difficulties in combining the experimental infrastructure of an ion trapping set-up into a dilution refrigerator with superconducting qubits and present solutions that can be immediately implemented using current technology.