Peter P. Orth
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View article: Optimal spatial searches with long-range tunneling
Optimal spatial searches with long-range tunneling Open
A quantum walk on a lattice is a paradigm of a quantum search in a database. The database qubit strings are the lattice sites, qubit rotations are tunneling events, and the target site is tagged by an energy shift. For quantum walks on a c…
View article: Discovery of an unconventional quantum echo by interference of Higgs coherence
Discovery of an unconventional quantum echo by interference of Higgs coherence Open
Detecting photon echoes from superconducting Higgs modes is challenging due to the necessity of preserving and retrieving phase coherence encoded in multiple Higgs and quasiparticle (QP) excitations. Here, we demonstrate the emergence of a…
View article: Classical Benchmarks for Variational Quantum Eigensolver Simulations of the Hubbard Model
Classical Benchmarks for Variational Quantum Eigensolver Simulations of the Hubbard Model Open
Simulating the Hubbard model is of great interest to a wide range of applications within condensed matter physics, however its solution on classical computers remains challenging in dimensions larger than one. The relative simplicity of th…
View article: Observation of the axion quasiparticle in 2D MnBi2Te4
Observation of the axion quasiparticle in 2D MnBi2Te4 Open
View article: Adaptive variational quantum dynamics simulations with compressed circuits and fewer measurements
Adaptive variational quantum dynamics simulations with compressed circuits and fewer measurements Open
The adaptive variational quantum dynamics simulation (AVQDS) method performs real-time evolution of quantum states using automatically generated parametrized quantum circuits that often contain substantially fewer gates than Trotter circui…
View article: Data generation for fidelity of spatial search on cubic geometries with long-range tunneling
Data generation for fidelity of spatial search on cubic geometries with long-range tunneling Open
Optimal spatial searches with long-range tunnelingby Emma C. King, Moritz Linnebacher, Peter P. Orth, Matteo Rizzi, Giovanna Morigi [arXiv:2501.08148] This Python notebook computes and visualizes the data for $\chi_\alpha$, cf. Fig. 3 of t…
View article: Spiral Spin Liquid State in the Corrugated Honeycomb Lattice of CaMn$_2$P$_2$
Spiral Spin Liquid State in the Corrugated Honeycomb Lattice of CaMn$_2$P$_2$ Open
CaMn$_2$P$_2$ exemplifies the realization of a frustrated $J_1$-$J_2$-$J_3$ Heisenberg model of a corrugated honeycomb magnetic lattice. Previous studies show that below the Néel temperature ($T_{\rm N}$), the system forms a cycloidal $6\t…
View article: Overcoming Ck1a Liability in the Discovery of a Series of Iso-Indolinone Glutarimides as Selective Ikzf2 Molecular Glue Degraders
Overcoming Ck1a Liability in the Discovery of a Series of Iso-Indolinone Glutarimides as Selective Ikzf2 Molecular Glue Degraders Open
View article: Problem-tailored Simulation of Energy Transport on Noisy Quantum Computers
Problem-tailored Simulation of Energy Transport on Noisy Quantum Computers Open
The transport of conserved quantities like spin and charge is fundamental to characterizing the behavior of quantum many-body systems. Numerically simulating such dynamics is generically challenging, which motivates the consideration of qu…
View article: Probing Majorana Wave Functions in Kitaev Honeycomb Spin Liquids with Second-Order Two-Dimensional Spectroscopy
Probing Majorana Wave Functions in Kitaev Honeycomb Spin Liquids with Second-Order Two-Dimensional Spectroscopy Open
Two-dimensional coherent terahertz spectroscopy (2DCS) emerges as a valuable tool to probe the nature, couplings, and lifetimes of excitations in quantum materials. It thus promises to identify unique signatures of spin liquid states in qu…
View article: Quantum subspace expansion in the presence of hardware noise
Quantum subspace expansion in the presence of hardware noise Open
Finding ground state energies on current quantum processing units (QPUs) using algorithms such as the variational quantum eigensolver (VQE) continues to pose challenges. Hardware noise severely affects both the expressivity and trainabilit…
View article: Adaptive variational quantum dynamics simulations with compressed circuits and fewer measurements
Adaptive variational quantum dynamics simulations with compressed circuits and fewer measurements Open
The adaptive variational quantum dynamics simulation (AVQDS) method performs real-time evolution of quantum states using automatically generated parameterized quantum circuits that often contain substantially fewer gates than Trotter circu…
View article: Two-dimensional coherent spectrum of high-spin models via a quantum computing approach
Two-dimensional coherent spectrum of high-spin models via a quantum computing approach Open
We present and benchmark a quantum computing approach to calculate the two-dimensional coherent spectrum (2DCS) of high-spin models. Our approach is based on simulating their real-time dynamics in the presence of several magnetic field pul…
View article: Quantum subspace expansion in the presence of hardware noise
Quantum subspace expansion in the presence of hardware noise Open
Finding ground state energies on current quantum processing units (QPUs) using algorithms like the variational quantum eigensolver (VQE) continues to pose challenges. Hardware noise severely affects both the expressivity and trainability o…
View article: Theory for <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Cd</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mi>As</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math> thin films in the presence of magnetic fields
Theory for thin films in the presence of magnetic fields Open
Here we present a theory for thin films of the Dirac semimetal Cd3As2 in the presence of magnetic fields. We show that, above a critical thickness, specific subbands n of thin film Cd3As2 are i…
View article: Chiral and flat-band magnetic quasiparticles in ferromagnetic and metallic kagome layers
Chiral and flat-band magnetic quasiparticles in ferromagnetic and metallic kagome layers Open
View article: Adaptive variational ground state preparation for spin-1 models on qubit-based architectures
Adaptive variational ground state preparation for spin-1 models on qubit-based architectures Open
Here, we apply the adaptive variational quantum imaginary time evolution (AVQITE) method to prepare ground states of one-dimensional spin S = 1 models. We compare different spin-to-qubit encodings (standard binary, Gray, unary, and multipl…
View article: Quantum order by disorder in frustrated spin nanotubes
Quantum order by disorder in frustrated spin nanotubes Open
Here we investigate quantum order by disorder in a frustrated spin nanotube formed by wrapping a J1–J2 Heisenberg model at 45° around a cylinder. Using Schwinger boson theory and density matrix renormalization group (DMRG), we have compute…
View article: Anisotropic multiband superconductivity in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mn>2</mml:mn><mml:mi>M</mml:mi><mml:mtext>−</mml:mtext><mml:msub><mml:mtext>WS</mml:mtext><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math> probed by controlled disorder
Anisotropic multiband superconductivity in probed by controlled disorder Open
The intrinsically superconducting Dirac semimetal 2M−WS2 is a promising candidate for realizing proximity-induced topological superconductivity in its protected surface states. A precise characterization of the bulk superconducting state i…
View article: Electron irradiation reveals robust fully gapped superconductivity in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>LaNiGa</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>
Electron irradiation reveals robust fully gapped superconductivity in Open
The effects of 2.5-MeV electron irradiation were studied in the superconducting phase of single crystals of LaNiGa2, using measurements of electrical transport and radio-frequency magnetic susceptibility. The London penetration …
View article: Theory for Cd$_3$As$_2$ thin films in the presence of magnetic fields
Theory for Cd$_3$As$_2$ thin films in the presence of magnetic fields Open
We present a theory for thin films of the Dirac semimetal Cd$_3$As$_2$ in the presence of magnetic fields. We show that, above a critical thickness, specific subbands $n$ of thin film Cd$_3$As$_2$ are in a quantum spin Hall insulator regim…
View article: Competing magnetic fluctuations and orders in a multiorbital model of doped <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>SrCo</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>As</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>
Competing magnetic fluctuations and orders in a multiorbital model of doped Open
Here, we revisit the intriguing magnetic behavior of the paradigmatic itinerant frustrated magnet SrCo2As2, which shows strong and competing magnetic fluctuations yet does not develop long-range magnetic order. By cal…
View article: Discovery of an Unconventional Quantum Echo by Interference of Higgs Coherence
Discovery of an Unconventional Quantum Echo by Interference of Higgs Coherence Open
Nonlinearities in quantum systems are fundamentally characterized by the interplay of phase coherences, their interference, and state transition amplitudes. Yet the question of how quantum coherence and interference manifest in transient, …
View article: Two-dimensional coherent spectrum of high-spin models via a quantum computing approach
Two-dimensional coherent spectrum of high-spin models via a quantum computing approach Open
We present and benchmark a quantum computing approach to calculate the two-dimensional coherent spectrum (2DCS) of high-spin models. Our approach is based on simulating their real-time dynamics in the presence of several magnetic field pul…
View article: Electron irradiation reveals robust fully gapped superconductivity in LaNiGa$_{2}$
Electron irradiation reveals robust fully gapped superconductivity in LaNiGa$_{2}$ Open
The effects of 2.5 MeV electron irradiation were studied in the superconducting phase of single crystals of LaNiGa$_2$, using measurements of electrical transport and radio-frequency magnetic susceptibility. The London penetration depth is…
View article: Kitaev model on a quantum computer using VQE with Majorana fermions
Kitaev model on a quantum computer using VQE with Majorana fermions Open
We study the simulation of the Kitaev spin model on quantum computers. In particular we focus on the models defined on the honeycomb, and square-octagon lattices. Using a fermionic language to describe these models reveals a region of the …
View article: Preparing quantum many-body scar states on quantum computers
Preparing quantum many-body scar states on quantum computers Open
Quantum many-body scar states are highly excited eigenstates of many-body systems that exhibit atypical entanglement and correlation properties relative to typical eigenstates at the same energy density. Scar states also give rise to infin…
View article: Quantum logic gate synthesis as a Markov decision process
Quantum logic gate synthesis as a Markov decision process Open
Reinforcement learning has witnessed recent applications to a variety of tasks in quantum programming. The underlying assumption is that those tasks could be modeled as Markov decision processes (MDPs). Here, we investigate the feasibility…
View article: Short-range magnetic correlations in quasicrystalline <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>i</mml:mi></mml:mrow></mml:math>-Tb-Cd
Short-range magnetic correlations in quasicrystalline -Tb-Cd Open
Here, we report on elastic and inelastic neutron scattering from single-grain isotopically enriched samples to elucidate the local magnetic correlations between Tb3+ moments in quasicrystalline i-Tb-Cd. The inelastic ne…
View article: Ab-initio simulations of coherent phonon-induced pumping of carriers in zirconium pentatelluride
Ab-initio simulations of coherent phonon-induced pumping of carriers in zirconium pentatelluride Open