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Articles by Daniel Malz
Robust Superradiance and Spontaneous Spin Ordering in Disordered Waveguide Quantum Electrodynamics
It is not necessary to obtain permission to reuse this article or its components as it is available under the terms of the Creative Commons Attribution 4.0 International license. This license permits unrestricted use, distribution, and reproduction in any medium, provided attribution to the author(s) and the published article's title, journal citation, and DOI are maintained. Please note that some figures may have been included with permission from other third parties.
[2602.16067] Contractivity of time-dependent driven-dissipative systems
[Submitted on 17 Feb 2026 ( v1 ), last revised 15 Oct 2026 (this version, v2)] Title:Contractivity of time-dependent driven-dissipative systems View a PDF of the paper titled Contractivity of time-dependent driven-dissipative systems, by Lasse H.
Deterministic generation of two-dimensional multi-photon cluster states - Nature Communications
Abstract Multidimensional cluster states are a key resource for robust quantum communication, measurement-based quantum computing and quantum metrology. Here, we present a device capable of emitting large-scale entangled microwave photonic states in a two dimensional ladder structure. The device consists of a pair of coupled superconducting transmon qubits which are each tuneably coupled to a common output waveguide.
Computational Complexity of Isometric Tensor-Network States
We determine the computational power of isometric tensor-network states (isoTNSs), a variational ansatz originally developed to numerically find and compute properties of gapped ground states and topological states in two dimensions. By mapping two-dimensional isoTNSs to ()D unitary quantum circuits, we find that the computation of local expectation values in isoTNSs (including those with translation-invariant bulk) is BQP-complete.
Quantum and Classical Dynamics with Random Permutation Circuits
The dynamics of complex quantum systems are notoriously hard to simulate classically. That is in part because the number of resources required scales exponentially with the number of constituents or time. The macroscopic phenomenology of such systems, however, appears to be governed by relatively simple emergent laws. An interesting question, then, is to what extent these laws depend on the “quantumness” of the underlying dynamics.
Preparation of Matrix Product States with Log-Depth Quantum Circuits
We consider the preparation of matrix product states (MPS) on quantum devices via quantum circuits of local gates. We first prove that faithfully preparing translation-invariant normal MPS of N sites requires a circuit depth T=Ω(logN). We then introduce an algorithm based on the renormalization-group transformation to prepare normal MPS with an error ε in depth T=O[log(N/ε)], which is optimal.
Efficient adiabatic preparation of tensor network states
Abstract We propose and study a specific adiabatic path to prepare those tensor network states that are unique ground states of few-body parent Hamiltonians in finite lattices, which include normal tensor network states, as well as other relevant nonnormal states. This path guarantees a gap for finite systems and allows for efficient numerical simulation.
Few-Body Analog Quantum Simulation with Rydberg-Dressed Atoms in Optical Lattices
Abstract Most experiments with ultracold atoms in optical lattices have contact interactions and therefore operate at high densities of around one atom per site to observe the effect of strong interactions. Strong ranged interactions can be generated via Rydberg dressing, which opens up the path to exploring the physics of few interacting particles. Rather than the unit cells of a crystal, the sites of the optical lattice can now be interpreted as discretized space.
Topological magnon amplification
Abstract Topology is quickly becoming a cornerstone in our understanding of electronic systems. Like their electronic counterparts, bosonic systems can exhibit a topological band structure, but in real materials it is difficult to ascertain their topological nature, as their ground state is a simple condensate or the vacuum, and one has to rely instead on excited states, for example a characteristic thermal Hall response.
Optical backaction-evading measurement of a mechanical oscillator
Abstract Quantum mechanics imposes a limit on the precision of a continuous position measurement of a harmonic oscillator, due to backaction arising from quantum fluctuations in the measurement field. This standard quantum limit can be surpassed by monitoring only one of the two non-commuting quadratures of the motion, known as backaction-evading measurement. This technique has not been implemented using optical interferometers to date.
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