Dresden 2014 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 30: Superconductivity - Poster Session
TT 30.55: Poster
Montag, 31. März 2014, 15:00–19:00, P2
Controlling the coupling between phosphorus donor spins and a superconducting resonator by light — •Kai Mueller1,2, Christoph W. Zollitsch1,2, Felix Hoehne3, Martin S. Brandt3, Rudolf Gross1,2, and Hans Huebl1 — 1Walther-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, phosphorus spin ensembles are discussed for information storage due to their exceptionally long spin coherence- and lifetimes of the order of seconds [1, 2]. On the other hand, their long lifetime limits the rate at which this quantum memory can be set. One strategy to overcome this problem is to shine light on the system to excite the phosphorus donor electrons.
We investigate a spin ensemble consisting of phosphorus donors in silicon coupled to a superconducting coplanar waveguide resonator operating at GHz frequencies and below 1 K using microwave spectroscopy.
When illuminating the silicon with 1050 nm light, we find that the coupling between the spin ensemble and resonator is reduced, which is compatible with the excitation of donor electrons to the conduction band. Additionally, we will discuss the time constants involved in this process. Financial support via SFB 631 and NIM is gratefully acknowledged.
A. M. Tyryshkin, Nat. Mater. 11, 143-147 (2012)
G. Feher, Phys. Rev. 114, 1245 (1959)