Community Research and Development Information Service - CORDIS

Periodic Report Summary 1 - SUPTANGO (Steady-state entanglement with superconducting qubits)

During this reporting period I have conducted research on microwave superconducting resonators and qubits. This work has resulted in several publications and yet unpublished manuscripts, notably the following:

A. P. Krantz, A. Bengtsson, M. Simoen, S. Gustavsson, V. Shumeiko, W. D. Oliver, C. M. Wilson, P. Delsing, and J. Bylander. “Single-shot read-out of a superconducting qubit using a Josephson parametric oscillator.” Nature Communications 7, 11417 (2016).

B. M. Simoen, C. W. S. Chang, P. Krantz, J. Bylander, W. Wustmann, V. S. Shumeiko, P. Delsing, and C. M. Wilson. “Characterization of a multimode coplanar waveguide parametric amplifier.” Journal of Applied Physics 118, 154501 (2015).

C. J. Bylander. “Superconducting quantum bits of information – coherence and design improvements.” Ch. 18 in The Oxford Handbook of Small Superconductors, pp. 524-566, Oxford University Press, Ed. A. V. Narlikar (in press, Dec. 2016).

D. S. Gustavsson, F. Yan, G. Catelani, J. Bylander, A. Kamal, J. Birenbaum, D. Hover, D. Rosenberg, G. Samach, A. P. Sears, S. J. Weber, J. L. Yoder, J. Clarke, A. J. Kerman, F. Yoshihara, Y. Nakamura, T. P. Orlando, and W. D. Oliver. “Suppressing relaxation in superconducting qubits by quasiparticle pumping.” Science, accepted for publication (2016).

These results have impact in the scientific community, with potential applications in quantum information technology. In particular, paper A presents a novel and scalable method for ultra-sensitive quantum-state detection; paper B demonstrates amplification of microwaves at the quantum limit of sensitivity and represents a step toward continuous-variable quantum information processing; paper C is an invited review; and paper D provides an improved understanding of nonequilibrium charged quasiparticles as a source of energy relaxation in superconducting quits, and introduces a novel method to suppress this relaxation by dynamically reducing the concentration of quasiparticles.

The Marie Curie CIG has defrayed part of my salary costs, thus liberating funds for equipment and lab fees, and for hiring coworkers. It may have helped me attract other funding: I have secured grants, as PI and co-PI, enough to have a group currently consisting of two PhD students and two postdocs, and I co-advise several others. I get access to lab equipment through close collaboration with senior colleagues, and we have pooled resources to purchase new equipment.

Moreover, I teach courses at the master’s level and have supervised several senior theses; next year I will also supervise junior theses, at the bachelor’s level.

I do academic service on some internal committees and boards, notably as a member of the Faculty Senate. I am co-chair and editor of the proceedings of the upcoming 28th International Conference on Low Temperature Physics (LT28). I have helped organize several smaller conferences, workshops, and a summer school.

I have qualified for a permanent position, pending a decision by the President of the University.

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Life Sciences
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