Partial projected ensembles reveal slow tilt-constrained information spreadingProjected ensembles reveal information about quantum many-body dynamics beyond the reduced density matrix. Here we investigate how spatial constraints affect the emergence of this information in a…Yi-Rui Zhang, Yu-Jun Zhao, Han-Ze Li et al.·Sep 15, 2026SaveLearn
Phantom Codes: Hardness, Rate Optimal qLDPC Constructions, and Distance LimitsAn [[n,k,d]] stabilizer code is phantom if every in-block logical CNOT gate can be realized by a permutation of its physical qubits. This eliminates the large and complicated physical overhead…Rui Mao, Weixiao Sun, Shengyu Zhang·Sep 15, 2026SaveLearn
Truncated hybrid tensor networks for distributed quantum simulationSimulation of quantum many-body systems is a principal application of quantum computing, but available devices remain limited by the number of qubits and cannot accommodate systems of the desired…Yong Liu, Guangyao Huang, Weixu Shi et al.·Sep 15, 2026SaveLearn
Exact Ionization Amplitudes for a Delta-Function Well in an Arbitrary-Strength DC Electric FieldWe investigate finite-time field-induced ionization from a one-dimensional attractive delta-function well in a uniform dc electric field of arbitrary strength. Our aim is to determine the physical…Ilki Kim, Gerald J. Iafrate·Sep 15, 2026SaveLearn
A complete classification of the existence of finite-dimensional quantum solutions to inconsistent linear constraint systemsLinear constraint systems (LCS) provide a compact algebraic language for nonlocal games and state-independent contextuality. In the binary case the Mermin--Peres square shows that inconsistent LCS…Markus Frembs·Sep 15, 2026SaveLearn
Error-Bounded Fixed-Point Design of Super-Sample-Rate IIR Filters for Real-Time Superconducting Qubit Flux PredistortionFlux-activated two-qubit gates in superconducting processors require correction of line distortion, which otherwise produces residual detuning, conditional-phase error, and leakage. Prior…Matt Huszabianlou, Angelos Ioannou, Nirmalendu Bikash Patra et al.·Sep 15, 2026SaveLearn
Environmental records unlock universal quantum computation from thermal decoherenceAt a fixed thermal exposure, the same stabilizer processor can be classically simulable or quantum universal, depending on which environmental records its controller retains. We give an exact…Chenfeng Cao, Qi Zhao·Sep 15, 2026SaveLearn
Low-Depth Initial-State Preparation for Ground-State Energy Estimation of Two-Dimensional Strongly Correlated SystemsQuantum algorithms for ground-state energy estimation require initial states with non-negligible fidelity to the ground state. Guided by classical simulations, we design shallow circuits for the…Ryo Watanabe, Keisuke Fujii·Sep 15, 2026SaveLearn
Parametric two-qubit gates via Landau-Zener interferenceWe propose and demonstrate gates between two superconducting qubits based on quantum interference of consecutive Landau-Zener (LZ) transitions. This gate mechanism bridges between baseband and…Simon Geisert, Albert Hertel, Soeren Ihssen et al.·Sep 15, 2026SaveLearn
Adaptive Record Consistency in a Schulman-Type ModelAdaptive measurements test whether a retrocausal model preserves observable records when experiments are connected by classical feedback. We establish exact and quantitative composition constraints…D. M. Theshan N. Weerasinghe·Sep 14, 2026SaveLearn
Exact Work Characteristic Functions for Time-Dependent Bosonic Quadratic HamiltoniansWe derive an exact analytical expression for the characteristic function of work in closed many-body bosonic systems governed by general time-dependent quadratic Hamiltonians. This is made possible…F. Nicacio, R. N. P. Maia·Sep 14, 2026SaveLearn
Pump-Free Microwave-Optical Bell Pair Generation for Teleportation-Based Quantum TransductionThe coherent conversion between microwave and optical photons, known as quantum transduction, is critical for connecting superconducting processors to optical networks. Existing methods are limited…Fangxin Li, Jaesung Heo, Zhaoyou Wang et al.·Sep 14, 2026SaveLearn
qdmag: A Python package for simulating nonequilibrium magnetization of molecules using quantum master equationsWe present qdmag, a computational utility for calculating the magnetization of magnetic molecules in a time-varying external magnetic field by solving a generalized Lindblad quantum master equation…Shuanglong Liu, Xiao Chen, Andrew Cupo et al.·Sep 14, 2026SaveLearn
Geometric View of Iterative Fixed-Node DynamicsThe sign-structure of a quantum many-body ground state is a central quantity in fixed-node approaches to mitigating the Fermion sign problem. For continuum electronic-structure Hamiltonians, the…Pranav Kairon, Bryan K. Clark·Sep 14, 2026SaveLearn
Towards Surrogate Based Dequantization of Quantum Reinforcement LearningIn recent years, the utility of parameterized quantum circuits as function approximators has been widely studied. In the context of reinforcement learning, this approach has led to variational…Pablo Rodriguez-Grasa, Sofiene Jerbi, Mikel Sanz et al.·Sep 14, 2026SaveLearn
Error-corrected function estimation advantage in multiparameter HamiltoniansWe establish the ultimate precision limits for estimating a function of multiple Hamiltonian parameters in the presence of Markovian noise. By reducing multiparameter function estimation to an…Erfan Abbasgholinejad, Lorcán O. Conlon, Sean R. Muleady et al.·Sep 14, 2026SaveLearn
d-pod realization of nonadiabatic holonomic quantum computationHolonomic quantum computation (HQC) realizes quantum gates through non-Abelian geometric phases, providing an experimentally accessible approach to quantum control. While the nonadiabatic HQC…Oskar Axelsson, Claes Fälth, Elias Henriksson Lindberg et al.·Sep 14, 2026SaveLearn
Link-middle-cut lower bounds for Clifford circuit synthesisMinimizing the number of CNOT gates required to synthesize a Clifford operator is a central problem in quantum circuit optimization. We extend the link--middle--cut (LMC) framework for linear…Søren Fuglede Jørgensen·Sep 14, 2026SaveLearn
Utility-Based Path Selection and Configuration in Quantum Networks via Layered Shortest PathsA path in a quantum network is a chain of repeaters that distributes entanglement between two users. Selecting a path requires balancing the rate and quality (e.g., fidelity) of the delivered…Leonardo Bacciottini, Subhransu Maji, Don Towsley et al.·Sep 14, 2026SaveLearn
Why Are We Unrolling? The Importance of Structured Quantum Programs for CompilationAs quantum software stacks scale up to support future fault-tolerant quantum hardware and algorithms, quantum compilation is becoming an increasingly important component of the stack. How do we…Damian Rovara, Daniel Haag, Mark Koch et al.·Sep 14, 2026SaveLearn
Noise-induced classical phases in optimally-unraveled random quantum circuitsWe study the classical simulability of open quantum dynamics using random Clifford circuits doped with non-Clifford phase rotations and subject to local noise. We unravel the dynamics into stochastic…Lorenzo Fioroni, Filippo Ferrari, Emanuele Tirrito·Sep 14, 2026SaveLearn
Towards Block-Level Fault-Tolerant Quantum Simulation on Small High-Rate Non-CSS CodesSmall high-rate non-CSS stabilizer codes provide compact platforms for encoded quantum computation, but mixed-Pauli checks and limited native transversal logical gates complicate fault-tolerant…Zhuangzhuang Chen, Narayanan Rengaswamy·Sep 14, 2026SaveLearn
Investigating Interacting Fermionic Models with Locality-Preserving Qubit EncodingsWe investigate the utility of the locality-preserving Derby-Klassen (DK) fermion-to-qubit mapping [arXiv:2003.06939] for variational quantum simulation of two-dimensional t-V and Fermi-Hubbard…Ashutosh P. Tripathi, Debasish Banerjee, Sandip Maiti et al.·Sep 14, 2026SaveLearn
Designs without disorder: unitary k-designs from a single-site bulk defectWe show that an O(1) local defect is sufficient to generate approximate unitary k-designs from an otherwise integrable quantum many-body system. Using a two-Pauli-kick (2PK) protocol with…Samudra Sur, Pratik Nandy·Sep 14, 2026SaveLearn
Pulse-Level Compilation of Measurement-Free Recovery in Transmon CircuitsQuantum error correction commonly relies on syndrome measurement, decoding, and conditional feedback. We numerically show that the conditional spectrum of an interacting transmon circuit can compile…Yi-Han Yu, Kai Xu, Heng Fan·Sep 14, 2026SaveLearn