Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Against probability: A quantum state is more than a list of probability distributions
Ladina Hausmann, Renato Renner·Jan 26, 2026
The state $ρ$ of a quantum system can be represented by a vector $\mathbf{P}_{\mathcal{M}}(ρ)$ of outcome probabilities for a set of measurements $\mathcal{M}$. Such representations appear throughout physics, for example, in quantum field theory via ...
Eigenstate condensation in quantum systems with finite-dimensional Hilbert spaces
Christopher David White, Michael Winer, Noam Bernstein·Jan 26, 2026
Random quantum states drawn from the Haar ensemble with a constraint on the energy expectation value $E_{\mathrm{av}} = \langle ψ| H | ψ\rangle$ display \textit{eigenstate condensation}: for $E_{\mathrm{av}}$ below a critical value $E_c$, they develo...
Post-selection games
Víctor Calleja Rodríguez, Ivan A. Bocanegra-Garay, Mateus Araújo·Jan 26, 2026
In this paper, we introduce post-selection games, a generalization of nonlocal games where each round can be not only won or lost by the players, but also discarded by the referee. Such games naturally formalize possibilistic proofs of nonlocality, s...
Tame Complexity of Effective Field Theories in the Quantum Gravity Landscape
Thomas W. Grimm, David Prieto, Mick van Vliet·Jan 26, 2026
Effective field theories consistent with quantum gravity obey surprising finiteness constraints, appearing in several distinct but interconnected forms. In this work we develop a framework that unifies these observations by proposing that the definin...
Jordan-Wigner mapping between quantum-spin and fermionic Casimir effects
Katsumasa Nakayama, Kei Suzuki·Jan 26, 2026
The Jordan-Wigner transformation connects spin operators in one-dimensional spin systems and fermionic operators. In this work, we elucidate the relationship between the finite-size corrections in the spin representation and the fermionic Casimir eff...
Hamiltonian Decoded Quantum Interferometry for General Pauli Hamiltonians
Kaifeng Bu, Weichen Gu, Xiang Li·Jan 26, 2026
In this work, we study the Hamiltonian Decoded Quantum Interferometry (HDQI) for the general Hamiltonians $H=\sum_ic_iP_i$ on an $n$-qubit system, where the coefficients $c_i\in \mathbb{R}$ and $P_i$ are Pauli operators. We show that, given access to...
Practical block encodings of matrix polynomials that can also be trivially controlled
Martina Nibbi, Filippo Della Chiara, Yizhi Shen +2 more·Jan 26, 2026
Quantum circuits naturally implement unitary operations on input quantum states. However, non-unitary operations can also be implemented through block encodings, where additional ancilla qubits are introduced and later measured. While block encoding ...
Efficient Trotter-Suzuki Schemes for Long-time Quantum Dynamics
Marko Maležič, Johann Ostmeyer·Jan 26, 2026
Accurately simulating long-time dynamics of many-body systems is a challenge in both classical and quantum computing due to the accumulation of Trotter errors. While low-order Trotter-Suzuki decompositions are straightforward to implement, their rapi...
Coherent control of photon pairs via quantum interference between second- and third-order quantum nonlinear processes
Alessia Stefano, Samuel E. Fontaine, J. E. Sipe +1 more·Jan 26, 2026
Genuine quantum interference between independent nonlinear processes of different order provides a route to coherent control that cannot be reduced to a classical field interference. Here we present an all-optical analogue of coherent carrier injecti...
Approximate level-by-level maximum-likelihood decoding based on the Chase algorithm for high-rate concatenated stabilizer codes
Takeshi Kakizaki·Jan 26, 2026
Fault-tolerant quantum computation (FTQC) is expected to address a wide range of computational problems. To realize large-scale FTQC, it is essential to encode logical qubits using quantum error-correcting codes. High-rate concatenated codes have rec...
On the Stochastic-Quantum Correspondence
Sami Calvo·Jan 26, 2026
This paper aims to first explain, somewhat more clearly, the Stochastic-Quantum correspondence put forward in by Barandes in 2023. Specifically, the quantum-mechanical bra-ket notation is used, illuminating some results of previous results. With this...
Nontrivial bounds on extractable energy in quantum energy teleportation for gapped manybody systems with a unique ground state
Taisanul Haque·Jan 26, 2026
We establish an exponentially decaying upper bound on the average energy that can be extracted in quantum energy teleportation (QET) protocols executed on finite-range {gapped} lattice systems possessing a unique ground state. Under mild regularity a...
Analyzing Images of Blood Cells with Quantum Machine Learning Methods: Equilibrium Propagation and Variational Quantum Circuits to Detect Acute Myeloid Leukemia
A. Bano, L. Liebovitch·Jan 26, 2026
This paper presents a feasibility study demonstrating that quantum machine learning (QML) algorithms achieve competitive performance on real-world medical imaging despite operating under severe constraints. We evaluate Equilibrium Propagation (EP), a...
Data-Driven Qubit Characterization and Optimal Control using Deep Learning
Paul Surrey, Julian D. Teske, Tobias Hangleiter +2 more·Jan 26, 2026
Quantum computing requires the optimization of control pulses to achieve high-fidelity quantum gates. We propose a machine learning-based protocol to address the challenges of evaluating gradients and modeling complex system dynamics. By training a r...
Operationally induced preferred basis in unitary quantum mechanics
Vitaly Pronskikh·Jan 26, 2026
The preferred-basis problem and the definite-outcome aspect of the measurement problem persist even when the detector is modeled unitarily. Experimental data are represented in a Boolean event algebra of mutually exclusive records, while the theoreti...
Error-mitigation aware benchmarking strategy for quantum optimization problems
Marine Demarty, Bo Yang, Kenza Hammam +1 more·Jan 26, 2026
Assessing whether a noisy quantum device can potentially exhibit quantum advantage is essential for selecting practical quantum utility tasks that are not efficiently verifiable by classical means. For optimization, a prominent candidate for quantum ...
Quantum Rotation Diversity in Displaced Squeezed Binary Phase-Shift Keying
Ioannis Krikidis·Jan 26, 2026
We propose a quantum rotation diversity (QRD) scheme for optical quantum communication using binary phase-shift-keying displaced squeezed states and homodyne detection over Gamma-Gamma turbulence channels. Consecutive temporal modes are coupled by a ...
Universality of Many-body Projected Ensemble for Learning Quantum Data Distribution
Quoc Hoan Tran, Koki Chinzei, Yasuhiro Endo +1 more·Jan 26, 2026
Generating quantum data by learning the underlying quantum distribution poses challenges in both theoretical and practical scenarios, yet it is a critical task for understanding quantum systems. A fundamental question in quantum machine learning (QML...
Bayesian Optimization for Quantum Error-Correcting Code Discovery
Yihua Chengyu, Richard Meister, Conor Carty +2 more·Jan 26, 2026
Quantum error-correcting codes protect fragile quantum information by encoding it redundantly, but identifying codes that perform well in practice with minimal overhead remains difficult due to the combinatorial search space and the high cost of logi...
Sufficient conditions for additivity of the zero-error classical capacity of quantum channels
Jeonghoon Park, Jeong San Kim·Jan 26, 2026
The one-shot zero-error classical capacity of a quantum channel is the amount of classical information that can be transmitted with zero probability of error by a single use. Then the one-shot zero-error classical capacity equals to the logarithmic v...