Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Ultraviolet structure of entanglement harvesting from energy density and other quadratic couplings
Matheus H. Zambianco, Boris Ragula, Eduardo Martín-Martínez·Jul 14, 2026
We study entanglement harvesting with particle detectors coupled to the renormalized energy density of a massless scalar field. Our analysis identifies the distributional mechanism underlying the persistent ultraviolet divergences previously observed...
High-fidelity entanglement of polar molecules by dynamic geometric control
Scarlett S. Yu, Avikar Periwal, Jiaqi You +6 more·Jul 14, 2026
In quantum information systems made of optical tweezer arrays of ultracold molecules, thermal motion of molecules degrades the coherence of their interactions, which limits entanglement fidelity and the concomitant scientific applicability of these s...
The Infraparticle Edge
Soo-Jong Rey·Jul 14, 2026
I derive the charged-particle spectral edge from the quantum instrument of soft QED. I use two projections of that instrument. Tracing over unresolved photons gives the reduced hard-sector channel. Pushing the outcomes to total energy gives the inclu...
Spin Chain Quantum Communication on a Trapped-Ion Processor
Madhumita Sarkar, Trinity Pointon, Sougato Bose·Jul 14, 2026
Efficient communication between distant qubits is one of the central challenges in scaling quantum processors. Although engineered spin chain protocols have been extensively investigated theoretically, their experimental realization has remained comp...
Expressibility and trainability of a two-dimensional pairwise quantum-circuit ansatz
Shuai Zhang, Wei Liu, Ji-Chong Yang·Jul 14, 2026
Parameterized quantum circuits~(PQCs) constitute a central building block of variational quantum algorithms~(VQAs) and quantum machine learning~(QML) methods. Existing ansatz designs often adopt hardware-agnostic or simplified 1D chain/ring entanglem...
Fixed-Boost Wigner Noise: Strict Trace-Distance Contraction without Quantum Degradability
Maxim V. Churilov·Jul 14, 2026
A Lorentz boost acts on the canonical spin of a massive particle through a momentum-dependent Wigner rotation. We show that, for one fixed observer boost, reducing over an uncertain momentum can strictly contract every pairwise spin-state trace dista...
A Noise-Aware Quantum Algorithm for Credit Valuation Adjustments on Real Quantum Hardware
Guillem Borràs Espert, Francisco Gómez Casanova, Luis de Pedro Sánchez +2 more·Jul 14, 2026
Credit Valuation Adjustment (CVA) requires repeated risk-neutral expectation estimation, making it a natural test bed for quantum amplitude estimation, whose coherent amplification can in principle reduce Monte Carlo sampling cost. Whether this advan...
A cryogenic neutral-atom platform with full optical access and 2-hour trap lifetime
Akhil Kumar, Lorenzo Festa, Avishay Grinberg +10 more·Jul 14, 2026
Neutral-atom quantum processors are rapidly scaling toward system sizes of more than ten thousand qubits, allowing for the realization of a new class of quantum computing algorithms and quantum simulation experiments. However, current neutral-atom pl...
The log log jam in Gaussian state tomography
Sitan Chen, Weiyuan Gong, Qi Ye +1 more·Jul 14, 2026
Unlike in finite dimensions, quantum information in continuous-variable systems has the peculiar feature that without imposing physical constraints, the sample complexity of state tomography can be unbounded. Remarkably, this is even the case for sta...
An Agentic Formalization for Certified Quantum Neural Network Design
Mingrui Jing, Lei Zhang, Yusheng Zhao +2 more·Jul 14, 2026
A central model in quantum machine learning is the quantum neural network (QNN), whose design requires balancing expressivity and trainability. Technically, expressivity is studied through circuit-function analysis, such as quantum signal processing,...
SiMOS quantum-dot spin qubits enabled by extreme-ultraviolet lithography
Thomas Van Caekenberghe, Paul Steinacker, Bart Raes +31 more·Jul 14, 2026
The realization of large-scale silicon quantum processors requires spin qubits compatible with advanced semiconductor manufacturing technologies, demanding lithographic processes that combine nanometer-scale precision with exceptional uniformity. Alt...
Maximal Classicalization of Finite-Group Quantum Reference-Frame Noise
Maxim V. Churilov·Jul 14, 2026
A finite quantum reference token with group-valued misalignment induces a random-unitary channel, but optimal degradation is generally an optimization over all quantum post-processings. For a unitary representation U of a finite group G, we prove tha...
Nonreciprocal Quantum Mpemba Effect
Wei-Bin Yan, Ying-Jie Zhang, Yun-Jie Xia +2 more·Jul 14, 2026
We demonstrate a nonreciprocal quantum Mpemba effect. Consider a broad class of open quantum systems, each coupled to two isomorphic reservoirs through symmetric ports. Interchanging the parameters of the two reservoirs -- a discrete operation we cal...
Active Quantum Nematics: The First Quantization
Ghansham Chandel, Siddhartha Das·Jul 14, 2026
Nematic symmetry entails conserved quantized quantities such as number of topological defects and vorticity cells. Correspondingly, countless quantum analogies have been found in Active Nematics. We formalize Active Nematics and Liquid Crystal theory...
Logical Entangling with Phantom Codes in Hypergraph Products
Keming He, Ziao Tang, Zetong Li +2 more·Jul 14, 2026
Logical entangling gates are a major source of physical spacetime overhead in fault-tolerant quantum computation. Phantom codes reduce this cost by implementing every ordered in-block logical CNOT through physical qubit permutations and Pauli-frame u...
Ancilla-Depth Phase Diagrams for Quantum Reference-Frame Comparison
Maxim V. Churilov·Jul 14, 2026
Comparing two noisy quantum reference frames as statistical experiments depends on the dimension of the ancillary memory available to the decision procedure. For finite-dimensional channels A and B with invertible A, we show that exact simulation of ...
Large sets of mutually orthogonal quantum Latin squares
Simeon Ball, Robin Simoens·Jul 14, 2026
How large can a set of mutually orthogonal quantum Latin squares (MOQLS) get? We show that a set of n - 2 MOQLS of order n is necessarily classical and construct large non-classical sets of MOQLS of orders that are prime powers, improving both the pr...
Heisenberg-limited metrology in the presence of non-Markovian noise with finite control rates
Shravan Shravan, Tyler G. Thurtell·Jul 14, 2026
Recently, it has been shown that protocols utilizing infinitely fast controls, such as quantum error correction, can in principle restore Heisenberg-limited frequency estimation in the presence of a broad class of non-Markovian noise models arising f...
Obstructions to Deformation Quantization of Bundles
Vladimir Baranovsky, Greg Huey·Jul 14, 2026
Let $\left(M, \mathcal{O}_M \right)$ be a smooth algebraic variety over field $κ$ of characteristic $0$ with an algebraic symplectic form $ω$, or a complex manifold with a holomorphic form $ω$. Furthermore, let $E$ be a vector bundle over $\left(M, \...
Unitary Synthesis with Near-Optimal T-Count for Near-Clifford Unitaries
Wang Fang, Chris Heunen, Qisheng Wang·Jul 14, 2026
We present an approach to unitary synthesis that implements an arbitrary $n$-qubit unitary operator $U$ by a Clifford+T circuit with T-count $\widetilde{O}(2^n d_F^{\mathcal{C}}(U))$, where $d_F^{\mathcal{C}}(U)$ is the Frobenius norm distance of $U$...