Paper Classical certification of quantum gates under the dimension assumption Jan Nöller, Nikolai Miklin, Martin Kliesch, and Mariami Gachechiladze, Quantum 9, 1825 (2025). The rapid advancement of quantum hardware necessitates the development of reliable methods to certify its correct functioning. However, existing certification tests fall short, as they eithe…
Paper Quantum control of continuous systems via nonharmonic potential modulation Piotr T. Grochowski, Hannes Pichler, Cindy A. Regal, and Oriol Romero-Isart, Quantum 9, 1824 (2025). We present a theoretical proposal for preparing and manipulating a state of a single continuous-variable degree of freedom confined to a nonharmonic potential. By utilizing optimally control…
Paper Density matrix representation of hybrid tensor networks for noisy quantum devices Hiroyuki Harada, Yasunari Suzuki, Bo Yang, Yuuki Tokunaga, and Suguru Endo, Quantum 9, 1823 (2025). The hybrid tensor network (HTN) method is a general framework allowing for the construction of an effective wavefunction with the combination of classical tensors and quantum tensors, i.e.,…
Paper Nonlinear Spectroscopy via Generalized Quantum Phase Estimation Ignacio Loaiza, Danial Motlagh, Kasra Hejazi, Modjtaba Shokrian Zini, Alain Delgado, and Juan Miguel Arrazola, Quantum 9, 1822 (2025). Response theory has a successful history of connecting experimental observations with theoretical predictions. Of particular interest is the optical response of matter, from which spectrosco…
Paper Families of $d=2$ 2D subsystem stabilizer codes for universal Hamiltonian quantum computation with two-body interactions Phattharaporn Singkanipa, Zihan Xia, and Daniel A. Lidar, Quantum 9, 1821 (2025). In the absence of fault tolerant quantum error correction for analog, Hamiltonian quantum computation, error suppression via energy penalties is an effective alternative. We construct famili…
Paper A little bit of self-correction Michael J. Kastoryano, Lasse B. Kristensen, Chi-Fang Chen, and Andras Gilyén, Quantum 9, 1820 (2025). We investigate the emergence of stable subspaces in the low-temperature quantum thermal dynamics of finite spin chains. Our analysis reveals the existence of effective decoherence-free qudit…
Paper Connecting extended Wigner’s friend arguments and noncontextuality Laurens Walleghem, Yìlè Yīng, Rafael Wagner, and David Schmid, Quantum 9, 1819 (2025). The Local Friendliness argument is an extended Wigner's friend no-go theorem that provides strong constraints on the nature of reality – stronger even than those imposed by Bell's theorem or…
Paper Multipartite Embezzlement of Entanglement Lauritz van Luijk, Alexander Stottmeister, and Henrik Wilming, Quantum 9, 1818 (2025). Embezzlement of entanglement refers to the task of extracting entanglement from an entanglement resource via local operations and without communication while perturbing the resource arbitrar…
Paper Learning unitaries with quantum statistical queries Armando Angrisani, Quantum 9, 1817 (2025). We propose several algorithms for learning unitary operators from quantum statistical queries with respect to their Choi-Jamiolkowski state. Quantum statistical queries capture the capabilit…
Paper Dual-unitary shadow tomography Ahmed A. Akhtar, Namit Anand, Jeffrey Marshall, and Yi-Zhuang You, Quantum 9, 1816 (2025). We introduce “dual-unitary shadow tomography'' (DUST), a classical shadow tomography protocol based on dual-unitary brick-wall circuits. To quantify the performance of DUST, we study operato…
Paper Conservation Laws For Every Quantum Measurement Outcome Daniel Collins and Sandu Popescu, Quantum 9, 1815 (2025). In the paradigmatic example of quantum measurements, whenever one measures a system which starts in a superposition of two states of a conserved quantity, it jumps to one of the two states,…
Paper Exact Model Reduction for Continuous-Time Open Quantum Dynamics Tommaso Grigoletto, Yukuan Tao, Francesco Ticozzi, and Lorenza Viola, Quantum 9, 1814 (2025). We consider finite-dimensional many-body quantum systems described by time-independent Hamiltonians and Markovian master equations, and present a systematic method for constructing smaller-d…
Paper Quantum Learning Theory Beyond Batch Binary Classification Preetham Mohan and Ambuj Tewari, Quantum 9, 1813 (2025). Arunachalam and de Wolf (2018) [1] showed that the sample complexity of quantum batch learning of boolean functions, in the realizable and agnostic settings, has the…
Paper Low variance estimations of many observables with tensor networks and informationally-complete measurements Stefano Mangini and Daniel Cavalcanti, Quantum 9, 1812 (2025). Accurately estimating the properties of quantum systems is a central challenge in quantum computing and quantum information. We propose a method to obtain unbiased estimators of multiple obs…
Paper Experiments with Schrödinger Cellular Automata Kees van Berkel, Jan de Graaf, and Kees van Hee, Quantum 9, 1811 (2025). We derive a class of cellular automata for the Schrödinger Hamiltonian, including scalar and vector potentials. It is based on a multi-split of the Hamiltonian, resulting in a multi-step uni…
Paper Circuit-level fault tolerance of cat codes Long D. H. My, Shushen Qin, and Hui Khoon Ng, Quantum 9, 1810 (2025). Bosonic codes encode quantum information into a single infinite-dimensional physical system endowed with error correction capabilities. This reduces the need for complex management of many p…
