Sebastian P. Horvath
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View article: There may be exactly $n$ $Q$-points
There may be exactly $n$ $Q$-points Open
We generalize the main result of arXiv:2505.17960 and show the consistency of the statement ``There are exactly $n$ $Q$-points up to isomorphism" for any finite $n$. Furthermore, we show that the above statement for $n=2$ can alternatively…
View article: Leveraging erasure errors in logical qubits with metastable $^{171}$Yb atoms
Leveraging erasure errors in logical qubits with metastable $^{171}$Yb atoms Open
Implementing large-scale quantum algorithms with practical advantage will require fault-tolerance achieved through quantum error correction, but the associated overhead is a significant cost. The overhead can be reduced by engineering phys…
View article: Enhancement of microwave to optical spin-based quantum transduction via a magnon mode
Enhancement of microwave to optical spin-based quantum transduction via a magnon mode Open
We propose a method for converting single microwave photons to single optical sideband photons based on spinful impurities in magnetic materials. This hybrid system is advantageous over previous proposals because (i) the implementation all…
View article: There may be a unique $Q$-point
There may be a unique $Q$-point Open
We show that in the model obtained by iteratively pseudo-intersecting a Ramsey ultrafilter via a length-$ω_2$ countable support iteration of restricted Mathias forcing over a ground model satisfying $\textsf{CH}$, there is a unique $Q$-poi…
View article: Spin-Photon Entanglement of a Single <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>Er</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math> Ion in the Telecom Band
Spin-Photon Entanglement of a Single Ion in the Telecom Band Open
Entanglement between photons and a quantum memory is a key component of quantum repeaters, which allow long-distance quantum entanglement distribution in the presence of fiber losses. Spin-photon entanglement has been implemented with a nu…
View article: Spectroscopy and Modeling of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>Yb</mml:mi></mml:mrow><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>171</mml:mn></mml:mrow></mml:mmultiscripts></mml:mrow></mml:math> Rydberg States for High-Fidelity Two-Qubit Gates
Spectroscopy and Modeling of Rydberg States for High-Fidelity Two-Qubit Gates Open
Highly excited Rydberg states and their interactions play an important role in quantum computing and simulation. These properties can be predicted accurately for alkali atoms with simple Rydberg level structures. However, an extension of t…
View article: Spin-photon entanglement of a single Er$^{3+}$ ion in the telecom band
Spin-photon entanglement of a single Er$^{3+}$ ion in the telecom band Open
Long-distance quantum communication using quantum repeaters is an enabling technology for secure communication, distributed quantum computing and quantum-enhanced sensing and metrology. As a building block of quantum repeaters, spin-photon…
View article: Spectroscopy and modeling of $^{171}$Yb Rydberg states for high-fidelity two-qubit gates
Spectroscopy and modeling of $^{171}$Yb Rydberg states for high-fidelity two-qubit gates Open
Highly excited Rydberg states and their interactions play an important role in quantum computing and simulation. These properties can be predicted accurately for alkali atoms with simple Rydberg level structures. However, an extension of t…
View article: Stark control of solid-state quantum memory with spin-wave storage
Stark control of solid-state quantum memory with spin-wave storage Open
Quantum memories for quantum communication need to be able to store photons for an extended time and then to release them on demand. This can be achieved in atomic frequency comb ensemble-based quantum memories by control pulses that trans…
View article: Optical coherence properties of Kramers' rare-earth ions at the nanoscale for quantum applications
Optical coherence properties of Kramers' rare-earth ions at the nanoscale for quantum applications Open
International audience
View article: Strong Purcell enhancement of an optical magnetic dipole transition
Strong Purcell enhancement of an optical magnetic dipole transition Open
Engineering the local density of states with nanophotonic structures is a powerful tool to control light-matter interactions via the Purcell effect. At optical frequencies, control over the electric field density of states is typically use…
View article: Replication Data for: Indistinguishable telecom band photons from a single erbium ion in the solid state
Replication Data for: Indistinguishable telecom band photons from a single erbium ion in the solid state Open
Data of the figures in Indistinguishable telecom band photons from a single erbium ion in the solid state
View article: Optical coherence properties of Kramers' rare-earth ions at the nanoscale for quantum applications
Optical coherence properties of Kramers' rare-earth ions at the nanoscale for quantum applications Open
Rare-earth (RE) ion doped nano-materials are promising candidates for a range of quantum technology applications. Among RE ions, the so-called Kramers' ions possess spin transitions in the GHz range at low magnetic fields, which allows for…
View article: Indistinguishable telecom band photons from a single erbium ion in the solid state
Indistinguishable telecom band photons from a single erbium ion in the solid state Open
Atomic defects in the solid state are a key component of quantum repeater networks for long-distance quantum communication. Recently, there has been significant interest in rare earth ions, in particular Er$^{3+}$ for its telecom-band opti…
View article: Stark control of solid-state quantum memory with spin-wave storage
Stark control of solid-state quantum memory with spin-wave storage Open
Quantum memories for quantum communication need to be able to store photons for an extended time and then to release them on demand. This can be achieved in atomic frequency comb ensemble based quantum memories by control pulses that trans…
View article: Er-doped anatase TiO2 thin films on LaAlO3 (001) for quantum interconnects (QuICs)
Er-doped anatase TiO2 thin films on LaAlO3 (001) for quantum interconnects (QuICs) Open
Rare-earth ions (REIs) doped into solid-state crystal hosts offer an attractive platform for realizing quantum interconnects that can function as quantum memories and quantum repeaters. The 4f valence electrons of REIs are shielded by 5s a…
View article: Erbium-implanted materials for quantum communication applications
Erbium-implanted materials for quantum communication applications Open
Erbium-doped materials can serve as spin-photon interfaces with optical transitions in the telecom C band, making them an exciting class of materials for long-distance quantum communication. However, the spin and optical coherence times of…
View article: Slow light frequency reference cavities—proof of concept for reducing the frequency sensitivity due to length fluctuations
Slow light frequency reference cavities—proof of concept for reducing the frequency sensitivity due to length fluctuations Open
Length changes due to thermo-mechanical noise originating from, for example, Brownian motion are a key limiting factor of present day state-of-the-art laser frequency stabilization using Fabry–Pérot cavities. We present a laser-frequency s…
View article: Erbium-Implanted Materials for Quantum Communication Applications
Erbium-Implanted Materials for Quantum Communication Applications Open
Erbium-doped materials can serve as spin-photon interfaces with optical transitions in the telecom C-band, making them an exciting class of materials for long-distance quantum communication. However, the spin and optical coherence times of…
View article: Experimental implementation of precisely tailored light-matter interaction via inverse engineering
Experimental implementation of precisely tailored light-matter interaction via inverse engineering Open
The zip file contains the data for all figures shown in the article Nature npj Quantum Information (2021)7:138. The .fig format can be opened natively in matlab, or with other open languages such as python, and in either case the data can …
View article: Optically Unstable Phase from Ion-Ion Interactions in an Erbium-Doped Crystal
Optically Unstable Phase from Ion-Ion Interactions in an Erbium-Doped Crystal Open
Optical many-body systems naturally possess strong light-matter interactions and are thus of central importance for photonic applications. However, these applications are so far limited within the regime of intrinsic dynamically stable pha…
View article: A simple experimental method for measuring the thermal sensitivity of single-mode fibers
A simple experimental method for measuring the thermal sensitivity of single-mode fibers Open
We present a simple technique to experimentally determine the optical-path length change with temperature for optical single-mode fibers. Standard single-mode fibers act as natural low-finesse cavities, with the Fresnel reflection of the s…
View article: Transferability of crystal-field parameters for rare-earth ions in Y-=SUB=-2-=/SUB=-SiO-=SUB=-5-=/SUB=- tested by Zeeman Spectroscopy -=SUP=-*-=/SUP=-
Transferability of crystal-field parameters for rare-earth ions in Y-=SUB=-2-=/SUB=-SiO-=SUB=-5-=/SUB=- tested by Zeeman Spectroscopy -=SUP=-*-=/SUP=- Open
Zeeman spectroscopy is used to demonstrate that phenomenological crystal-field parameters determined for the two C _1 point-group symmetry sites in Er^3+:Y_2SiO_5 may be transferred to other ions. The two crystallographic six-and seven-coo…
View article: Electron paramagnetic resonance enhanced crystal field analysis for low point-group symmetry systems: C<sub>2<i>v</i></sub>sites in Sm<sup>3+</sup>:CaF<sub>2</sub>/SrF<sub>2</sub>
Electron paramagnetic resonance enhanced crystal field analysis for low point-group symmetry systems: C<sub>2<i>v</i></sub>sites in Sm<sup>3+</sup>:CaF<sub>2</sub>/SrF<sub>2</sub> Open
We present a comprehensive spectroscopic study of C[Formula: see text] point-group symmetry sites in Sm[Formula: see text]:CaF[Formula: see text]/SrF[Formula: see text] codoped with either NaF or LiF. Data includes electron paramagnetic re…
View article: A comprehensive understanding of ground and optically-excited hyperfine structure of $^{167}$Er$^{3+}$:Y$_2$SiO$_5$
A comprehensive understanding of ground and optically-excited hyperfine structure of $^{167}$Er$^{3+}$:Y$_2$SiO$_5$ Open
Using high-performance computing techniques and targeted experimental investigation we have developed a predictive crystal-field model of the complex hyperfine structure of $^{167}$Er$^{3+}$:Y$_2$SiO$_5$ We simultaneously match site-select…
View article: Spin echoes in the ground and an optically excited state of $^{167}$Er$^{3+}$:Y$_2$SiO$_5$ at near-zero magnetic fields using Raman heterodyne spectroscopy
Spin echoes in the ground and an optically excited state of $^{167}$Er$^{3+}$:Y$_2$SiO$_5$ at near-zero magnetic fields using Raman heterodyne spectroscopy Open
Erbium-167-doped yttrium orthosilicate is an ideal candidate for a microwave-addressed quantum memory due to its telecom wavelength optical transition and hyperfine structure with and without an applied magnetic field. However, to date the…
View article: High-resolution spectroscopy and novel crystal-field methods for rare-earth based quantum information processing
High-resolution spectroscopy and novel crystal-field methods for rare-earth based quantum information processing Open
Rare-earth doped insulators have been widely recognized as excellent candidate materials for optical quantum computing and information processing. This is principally due to a combination of optical coherence times of up to milliseconds an…