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Dresden 2014 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 101: Transport - Poster Session

TT 101.25: Poster

Thursday, April 3, 2014, 15:00–19:00, P2

Spin relaxation of phosporus donors in silicon at millikelvin temperatures — •Christoph W. Zollitsch1,2, Felix Hoehne3, Martin S. Brandt3, Rudolf Gross1,2, and Hans Huebl11Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Garching — 2Physik-Department, Technische Universität München, Garching — 3Walter Schottky Institut, Technische Universität München, Garching

In the field of quantum information processing spin ensembles are promising candidates for quantum memories. To allow for the transfer of quantum information to the memory, the spin ensembles used are typically coupled to a microwave resonator, acting as a quantum bus. Regarding practical realizations, phosphorus dopants in silicon are very attractive due to their long spin coherence times [1,2]. Here, we investigate the coupling between an ensemble of phosphorus donors in silicon and a superconducting coplanar waveguide microwave resonator (CPWR) at temperatures below 1.4 K and study the electron spin resonance (ESR) saturation behavior to extract the relaxation time of the spin system. We find the expected linear dependence of the relaxation time on temperature between 1.4 K and 200 mK [3]. Additionally, we present initial pulsed ESR experiments allowing to access the full dynamics of the system.

Financial support by the DFG via SFB 631 and the Excellence Initiative via NIM is gratefully acknowledged.
A. M. Tyryshkin, Nat. Mater. 11, 143 (2012)
M. Steger, Science 336, 1280 (2012)
G. Feher, Phys. Rev. 114, 1245 (1959)

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