Publications (14)
Aluminium-oxide wires for superconducting high kinetic inductance circuits
H. Rotzinger, S. T. Skacel, M. Pfirrmann +7
We investigate thin films of conducting aluminium-oxide, also known as granular aluminium, as a material for superconducting high quality, high kinetic inductance circuits. The fil…
Evidence of Dilute Ferromagnetism in Rare-Earth doped YAG
W. G. Farr, M. Goryachev, J. M. le Floch +2
This work demonstrates strong coupling regime between an Erbium ion spin ensemble and microwave Hybrid Cavity-Whispering Gallery Modes in a Yttrium Aluminium Garnet dielectric crys…
Strong coupling of an Er3+ doped YAlO3 crystal to a superconducting resonator
A. Tkalcec, S. Probst, D. Rieger +7
Quantum memories are integral parts of both quantum computers and quantum communication networks. Naturally, such a memory is embedded into a hybrid quantum architecture, which has…
Quantitative evaluation of defect-models in superconducting phase qubits
J. H. Cole, C. Müller, P. Bushev +5
We use high-precision spectroscopy and detailed theoretical modelling to determine the form of the coupling between a superconducting phase qubit and a two-level defect. Fitting th…
Measuring the temperature dependence of individual two-level systems by direct coherent control
J. Lisenfeld, C. Müller, J. H. Cole +4
We demonstrate a new method to directly manipulate the state of individual two-level systems (TLS) in phase qubits. It allows one to characterize the coherence properties of TLS us…
Scanning Near-Field Optical Coherent Spectroscopy of Single Molecules at 1.4 Kelvin
I. Gerhardt, G. Wrigge, M. Agio +3
We present scanning near-field extinction spectra of single molecules embedded in a solid matrix. By varying the molecule-tip separation, we modify the line shape of the spectra, d…
Low-Temperature Microwave Properties of Biaxial YAlO3
N. C. Carvalho, M. Goryachev, J. Krupka +2
Low-loss crystals with defects due to paramagnetic or rare earth impurity ions is a major area of investigation for quantum hybrid systems at both optical and microwave frequencies…
Strong extinction of a laser beam by a single molecule
I. Gerhardt, G. Wrigge, P. Bushev +3
We present an experiment where a single molecule strongly affects the amplitude and phase of a laser field emerging from a subwavelength aperture. We achieve a visibility of -6% in…
Shot-noise limited monitoring and phase locking of the motion of a single trapped ion
P. Bushev, G. Hetet, L. Slodicka +5
We perform high-resolution real-time read-out of the motion of a single trapped and laser-cooled Ba ion. By using an interferometric setup we demonstrate shot-noise limited measure…
Entangling microscopic defects via a macroscopic quantum shuttle
G. J. Grabovskij, P. Bushev, J. H. Cole +4
In the microscopic world, multipartite entanglement has been achieved with various types of nanometer sized two-level systems such as trapped ions, atoms and photons. On the macros…
Rare earth spin ensemble magnetically coupled to a superconducting resonator
P. Bushev, A. K. Feofanov, H. Rotzinger +6
Interfacing superconducting quantum processors, working in the GHz frequency range, with optical quantum networks and atomic qubits is a challenging task for the implementation of…
Vacuum-field level shifts in a single trapped ion mediated by a single distant mirror
M. A. Wilson, P. Bushev, J. Eschner +4
A distant mirror leads to a vacuum-induced level shift in a laser-excited atom. This effect has been measured with a single mirror 25 cm away from a single, trapped barium ion. Thi…
Experimental and theoretical challenges for the trapped electron quantum computer
I. Marzoli, P. Tombesi, G. Ciaramicoli +11
We discuss quantum information processing with trapped electrons. After recalling the operation principle of planar Penning traps we sketch the experimental conditions to load, coo…
Trapped electron coupled to superconducting devices
P. Bushev, D. Bothner, J. Nagel +8
We propose to couple a trapped single electron to superconducting structures located at a variable distance from the electron. The electron is captured in a cryogenic Penning trap…