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Articles by Daniel Loss
Condensed Matter > Superconductivity
Collective modes in a superconductor correspond to fluctuations in the amplitude (Higgs mode) or the phase (Goldstone mode) of the order parameter. Starting from the BCS Hamiltonian, we derive a microscopic Hamiltonian for the coupled Higgs-Goldstone-electron system that contains all interactions among these degrees of freedom.
Fully tunable strong spin orbit interactions in light hole germanium quantum channels
Abstract Spin-orbit interaction is a fundamental component for electrically driven spin qubits and hybrid superconducting-semiconducting systems. In particular, Rashba spin-orbit interaction is a key mechanism enabling all-electrical spin manipulation schemes. However, in common planar systems, Rashba interaction is weak because of the small mixing between heavy-holes and light-holes, and instead relies on complex strain and interface phenomena that are hard to reliably harness in experiment.
Publisher Correction: Reply to: Conductance measurements cannot distinguish crossed Andreev reflection from elastic co-tunnelling in normal–superconductor–normal junctions
Correction to: Nature Physics https://doi.org/10.1038/s41567-026-03376-3, published online 28 July 2026. In the version of the article initially published, in the second paragraph, the text “…similar in magnitude to the ECT contribution \({T}_{12}^{{ee}}\), such that \({T}_{12}^{{ee}}\)” should have read “…similar in magnitude to the ECT contribution \({T}_{12}^{{ee}}\), such that \({T}_{12}^{{he}}\approx {T}_{12}^{{ee}}\)”.
Reply to: Conductance measurements cannot distinguish crossed Andreev reflection from elastic co-tunnelling in normal–superconductor–normal junctions
replying to E. S. Tikhonov & V. S. Khrapai Nature Physics https://doi.org/10.1038/s41567-026-03377-2 (2026) In our recent article1, we reported the presence of a long-range crossed Andreev reflection (CAR) contribution to the non-local conductance in a proximitized topological insulator nanowire. Our work also highlighted the intricate interplay of CAR and elastic co-tunnelling (ECT) transmission in mesoscopic superconducting systems. In particular, the conclusion of ref.
Condensed Matter > Mesoscale and Nanoscale Physics
[Submitted on 21 Apr 2026 (v1), last revised 16 Oct 2026 (this version, v2)] View PDF HTML (experimental) Comments: Subjects: Mesoscale and Nanoscale Physics (cond-mat.mes-hall); Materials Science (cond-mat.mtrl-sci); Quantum Physics (quant-ph) Cite as: arXiv:2604.19304 [cond-mat.mes-hall] (or arXiv:2604.19304v2 [cond-mat.mes-hall] for this version) https://doi.org/10.48550/arXiv.2604.19304 Journal reference: Adv. Electron. Mater. e70614 (2026) Related DOI: https://doi.org/10.1002/aelm.70614
[2604.19687] Spin Kerr-cat qubits
[Submitted on 21 Apr 2026 (v1), last revised 20 Oct 2026 (this version, v2)] View PDF HTML (experimental) Subjects: Quantum Physics (quant-ph) Cite as: arXiv:2604.19687 [quant-ph] (or arXiv:2604.19687v2 [quant-ph] for this version) https://doi.org/10.48550/arXiv.2604.19687 Related DOI: https://doi.org/10.1103/z3dj-95j6
Compromise-free scaling of qubit speed and coherence - Nature Communications
Abstract Across leading qubit platforms, a common trade-off persists: increasing coherence comes at the cost of operational speed, reflecting the notion that protecting a qubit from its noisy surroundings also limits control over it. This speed-coherence dilemma limits qubit performance across various technologies.
Long-range crossed Andreev reflection in a topological insulator nanowire proximitized by a superconductor - Nature Physics
Abstract Crossed Andreev reflection is a non-local transport phenomenon that creates and detects Cooper pair correlations between distant locations. It is also the basis of Cooper pair splitting to generate remote entanglement. Although crossed Andreev reflection has been extensively studied in semiconductors proximity-coupled to a superconductor, observing it in a topological insulator has been very difficult.
Strong hole-photon coupling in planar Ge for probing charge degree and strongly correlated states - Nature Communications
Abstract Semiconductor quantum dots (QDs) in planar germanium (Ge) heterostructures have emerged as front-runners for future hole-based quantum processors. Here, we present strong coupling between a hole charge qubit, defined in a double quantum dot (DQD) in planar Ge, and microwave photons in a high-impedance (Zr = 1.3 kΩ) resonator based on an array of superconducting quantum interference devices (SQUIDs).
Magnonic $\ensuremath{\varphi}$ Josephson junctions and synchronized precession
There has been a growing interest in non-Hermitian physics. One of its main goals is to engineer dissipation and to explore ensuing functionality. In magnonics, the effect of dissipation due to local damping on magnon transport has been explored. However, the effects of nonlocal damping on the magnonic analog of the Josephson effect remain missing, despite that nonlocal damping is inevitable and has been playing a central role in magnonics.
Quantum phase transitions and cat states in cavity-coupled quantum dots
We study double quantum dots coupled to a quasistatic cavity mode with high mode-volume compression allowing for strong light-matter coupling. Besides the cavity-mediated interaction, electrons in different double quantum dots interact with each other via dipole-dipole (Coulomb) interaction.
Valley-Free Silicon Fins Caused by Shear Strain
Abstract Electron spins confined in silicon quantum dots are promising candidates for large-scale quantum computers. However, the degeneracy of the conduction band of bulk silicon introduces additional levels dangerously close to the window of computational energies, where the quantum information can leak. The energy of the valley states—typically 0.1 meV—depends on hardly controllable atomistic disorder and still constitutes a fundamental limit to the scalability of these architectures.
High-Fidelity Spin Qubit Shuttling via Large Spin-Orbit Interactions
Popular Summary Scaling up a quantum computer is a formidable challenge. In semiconductor architectures, a key ingredient is spin shuttling, which alleviates the demanding technological constraints of dense architectures, enabling a higher qubit connectivity and leaving space for classical control electronics on chip.
Anisotropic exchange interaction of two hole-spin qubits - Nature Physics Original
Abstract Semiconductor spin qubits offer the potential to employ industrial transistor technology to produce large-scale quantum computers. Silicon hole spin qubits benefit from fast all-electrical qubit control and sweet spots to counteract charge and nuclear spin noise. However, the demonstration of a two-qubit interaction has remained an open challenge. One missing factor is an understanding of the exchange coupling in the presence of a strong spin–orbit interaction.
Spatially correlated classical and quantum noise in driven qubits - npj Quantum Information
Abstract Correlated noise across multiple qubits poses a significant challenge for achieving scalable and fault-tolerant quantum processors. Despite recent experimental efforts to quantify this noise in various qubit architectures, a comprehensive understanding of its role in qubit dynamics remains elusive. Here, we present an analytical study of the dynamics of driven qubits under spatially correlated noise, including both Markovian and non-Markovian noise.
Parity-protected superconducting diode effect in topological Josephson junctions
In bulk superconductors or Josephson junctions formed in materials with spin-orbit interaction, the critical current can depend on the direction of current flow or of applied magnetic field, an effect known as the superconducting (SC) diode effect. Here, we consider the SC diode effect in Josephson junctions in nanowire devices.
Dimensional reduction of the Luttinger-Ward functional for spin-degenerate $D$-dimensional electron gases
We consider an isotropic spin-degenerate interacting uniform D-dimensional electron gas (DDEG) with D>1 within the Luttinger-Ward (LW) formalism. We derive the asymptotically exact semiclassical/infrared limit of the LW functional at large distances, r≫λF, and large times, τ≫1/EF, where λF and EF are the Fermi wavelength and the Fermi energy, respectively. The LW functional is represented by skeleton diagrams, each skeleton diagram consists of appropriately connected dressed fermion loops.
Josephson transistor from the superconducting diode effect in domain wall and skyrmion magnetic racetracks
In superconductors, the combination of broken time-reversal and broken inversion symmetries can result in a critical current being dependent on the direction of current flow. This phenomenon is known as superconducting diode effect (SDE) and has great potential for applications in future low-temperature electronics.
Majorana bound states in germanium Josephson junctions via phase control
Abstract We consider superconductor-normal-superconductor-normal-superconductor (SNSNS) planar Josephson junctions in hole systems with spin-orbit interaction that is cubic in momentum (CSOI). Using only the superconducting phase difference, we find parameter regimes where junctions of experimentally achievable transparency can enter a topological superconducting phase with Majorana bound states (MBSs) at the junction ends.
General scattering and electronic states in a quantum-wire network of moir\'e systems
We investigate electronic states in a two-dimensional network consisting of interacting quantum wires, a model adopted for twisted bilayer systems. We construct general operators which describe various scattering processes in the system. In a twisted bilayer structure, the moiré periodicity allows for generalized umklapp scatterings, leading to a class of correlated states at certain fractional fillings.
Cavity-induced charge transfer in periodic systems: Length-gauge formalism
Abstract We develop a length-gauge formalism for treating one-dimensional periodic lattice systems in the presence of a photon cavity inducing light-matter interaction. The purpose of the formalism is to remove mathematical ambiguities that occur when defining the position operator in the context of the Power-Zienau-Woolley Hamiltonian. We then use a diagrammatic approach to analyze perturbatively the interaction between an electronic quantum system and a photonic cavity mode of long wavelength.
Determination of spin-orbit interaction in semiconductor nanostructures via nonlinear transport
Abstract We investigate nonlinear transport signatures stemming from linear and cubic spin-orbit interactions in one- and two-dimensional systems. The analytical zero-temperature response to external fields is complemented by a finite-temperature numerical analysis, establishing a way to distinguish between linear and cubic spin-orbit interactions.
Trivial Andreev Band Mimicking Topological Bulk Gap Reopening in the Nonlocal Conductance of Long Rashba Nanowires
Abstract We consider a one-dimensional Rashba nanowire in which multiple Andreev bound states in the bulk of the nanowire form an Andreev band. We show that, under certain circumstances, this trivial Andreev band can produce an apparent closing and reopening signature of the bulk band gap in the nonlocal conductance of the nanowire.
Enhancement of the Kondo effect in a quantum dot formed in a full-shell nanowire
Abstract We analyze results of a recent experiment [D. Razmadze, E. C. T. O'Farrell, P. Krogstrup, and C. M. Marcus, Phys. Rev. Lett. 125, 116803 (2020)] on transport through a quantum dot between two full-shell nanowires and show that the observed effects are caused by the Kondo effect enhancement due to a nontrivial geometry (magnetic flux in a full-shell nanowire) rather than the presence of Majorana bound states.
RKKY interaction at helical edges of topological superconductors
Abstract We study spin configurations of classical magnetic impurities placed close to the edge of a two-dimensional topological superconductor both analytically and numerically. First, we demonstrate that the spin of a single magnetic impurity close to the edge of a topological superconductor tends to align along the edge. The strong easy-axis spin anisotropy behind this effect originates from the interaction between the impurity and the gapless helical Majorana edge states.
Superfluid transport in quantum spin chains
Abstract Spin superfluids enable long-distance spin transport through classical ferromagnets by developing topologically stable magnetic textures. For small spins at low dimensions, however, the topological protection suffers from strong quantum fluctuations. We study the remanence of spin superfluidity inherited from the classical magnet by considering the two-terminal spin transport through a finite spin-1/2 magnetic chain with planar exchange.
Planar Josephson junctions in germanium: Effect of cubic spin-orbit interaction
Abstract Planar Josephson junctions comprising semiconductors with strong spin-orbit interaction (SOI) are promising platforms to host Majorana bound states (MBSs). Previous works on MBSs in planar Josephson junctions have focused on electron gases, where SOI is linear in momentum. In contrast, a two-dimensional hole gas in planar germanium (Ge) exhibits SOI that is cubic in momentum. Nevertheless, we show here that due to the particularly large SOI, Ge is a favorable material.
Giant magnetochiral anisotropy from quantum-confined surface states of topological insulator nanowires - Nature Nanotechnology
Abstract Wireless technology relies on the conversion of alternating electromagnetic fields into direct currents, a process known as rectification. Although rectifiers are normally based on semiconductor diodes, quantum mechanical non-reciprocal transport effects that enable a highly controllable rectification were recently discovered1,2,3,4,5,6,7,8,9.
Local and nonlocal quantum transport due to Andreev bound states in finite Rashba nanowires with superconducting and normal sections
Abstract We analyze Andreev bound states (ABSs) that form in normal sections of a Rashba nanowire that is only partially covered by a superconducting layer. These ABSs are localized close to the ends of the superconducting section and can be pinned to zero energy over a wide range of magnetic field strengths even if the nanowire is in the nontopological regime.
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