Papers
Live trends in quantum computing research, updated daily from arXiv.
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Hardware platform mentions in abstracts — Photonic leads
Continuum Limits of Lazy Open Quantum Walks
Lara Janiurek, Viv Kendon·Dec 19, 2025
We derive the continuous spacetime limit of the one dimensional lazy discrete time quantum walk, obtaining explicit macroscopic evolution equations for a three state model in the presence of decoherence. While continuum limits of two state quantum wa...
Inclusion constants for free spectrahedra with applications to quantum incompatibility
Andreas Bluhm, Eric Evert, Igor Klep +2 more·Dec 19, 2025
Building on the matrix cube problem, inclusions of free spectrahedra have been used successfully to obtain relaxations of hard spectrahedral inclusion problems. The quality of such a relaxation is quantified by the inclusion constant associated with ...
Frequency-Multiplexed Millimeter-Wave Fault-Tolerant Superconducting Qubits Enabled by an On-Chip Nonreciprocal Control Bus
Sajjad Taravati·Dec 19, 2025
Scaling superconducting quantum processors is fundamentally limited by the escalating complexity of cryogenic wiring and the debilitating effects of microwave crosstalk and Purcell decay. This paper proposes the concept of frequency-multiplexed milli...
Autonomous Picosecond-Precision Synchronization in Measurement-Device-Independent Quantum Key Distribution
A. P. Pljonkin·Dec 19, 2025
Measurement-device-independent quantum key distribution (MDI-QKD) eliminates detector side-channel attacks by relocating all measurements to an untrusted intermediate node. However, its practical implementation critically relies on picosecond-level t...
Rydberg Atomic RF Sensor-based Quantum Radar
Sourav Banerjee, Neel Kanth Kundu·Dec 19, 2025
Rydberg atom-based RF sensors offer distinct advantages over conventional dipole antennas for electric field detection. This paper presents a system model and performance analysis of a Rydberg atom-based quantum radar, which employs optical readout v...
On-Demand Millisecond Storage of Spectro-Temporal Multimode Telecom Photons
Anuj Sethia, Nasser Gohari Kamel, Daniel Oblak·Dec 19, 2025
The realization of scalable quantum networks for distribution of entanglement over long distances hinges on quantum repeaters. To outperform the exponential transmission loss in optical fibers, quantum repeaters must employ multiplexing schemes in th...
Attosecond Control of Squeezed Light
Russell Zimmerman, Shashank Kumar, Shiva Kant Tiwari +8 more·Dec 18, 2025
Squeezed light has revolutionized quantum metrology by enhancing interferometry for sensitive applications such as the detection of gravitational waves. Squeezed light has also played a pivotal role in quantum information science with numerous applic...
Non-Linear Strong Data-Processing for Quantum Hockey-Stick Divergences
Theshani Nuradha, Ian George, Christoph Hirche·Dec 18, 2025
Data-processing is a desired property of classical and quantum divergences and information measures. In information theory, the contraction coefficient measures how much the distinguishability of quantum states decreases when they are transmitted thr...
QuantumSavory: Write Symbolically, Run on Any Backend -- A Unified Simulation Toolkit for Quantum Computing and Networking
Hana KimLee, Leonardo Bacciottini, Abhishek Bhatt +2 more·Dec 18, 2025
Progress in quantum computing and networking depends on codesign across abstraction layers: device-level noise and heterogeneous hardware, algorithmic structure, and distributed classical control. We present QuantumSavory, an open-source toolkit buil...
Indistinguishable photons from a two-photon cascade
Timon L. Baltisberger, Francesco Salusti, Mark R. Hogg +7 more·Dec 18, 2025
Decay of a four-level diamond scheme via a cascade is a potential source of entangled photon pairs. A solid-state implementation is the biexciton cascade in a semiconductor quantum dot. While high entanglement fidelities have been demonstrated, the t...
Wichmann-Kroll vacuum polarization density in a finite Gaussian basis set
Ryan Benazzouk, Maen Salman, Trond Saue·Dec 18, 2025
This work further develops the calculation of QED effects in a finite Gaussian basis. We focus on the non-linear $α(Zα)^{n\ge 3}$ contribution to the vacuum polarization density, computing the energy shift of 1s$_{1/2}$ states of hydrogen-like ions. ...
Quantum-Inspired Ising Machines for Quantum Chemistry Calculations
Mahmood Hasani, Hadis Salasi, Negar Ashari Astani·Dec 18, 2025
Four decades after Richard Feynman's famous remark, we have reached a stage at which nature can be simulated quantum mechanically. Quantum simulation is among the most promising applications of quantum computing. However, like many quantum algorithms...
Amplifying Decoherence-Free Many-Body Interactions with Giant Atoms Coupled to Parametric Waveguide
Xin Wang, Zhao-Min Gao·Dec 18, 2025
Parametric amplification offers a powerful means to enhance quantum interactions through field squeezing, yet it typically introduces additional noise which accelerates quantum decoherence, a major obstacle for scalable quantum information processing...
Random coding for long-range continuous-variable QKD
Arpan Akash Ray, Boris Skoric·Dec 17, 2025
Quantum Key Distribution (QKD) schemes are key exchange protocols based on the physical properties of quantum channels. They avoid the computational-hardness assumptions that underlie the security of classical key exchange. Continuous-Variable QKD (C...
On the power of moving quantum sensors: fully flexible and noise-resilient sensing
Paul Aigner, Wolfgang Dür·Dec 17, 2025
We show that a single moving quantum sensor provides complete access to spatially correlated scalar fields. We demonstrate that with either trajectory or internal state control, one can selectively measure any linear functional, e.g. a gradient or a ...
Error mitigation for logical circuits using decoder confidence
Maria Dincă, Tim Chan, Simon C. Benjamin·Dec 17, 2025
Fault-tolerant quantum computers use decoders to monitor for errors and find a plausible correction. A decoder may provide a decoder confidence score (DCS) to gauge its success. We adopt a swim distance DCS, computed from the shortest path between sy...
Quadratic power enhancement in extended Dicke quantum battery
Harsh Sharma, Himadri Shekhar Dhar·Dec 17, 2025
We demonstrate a quadratic enhancement of power in a battery consisting of $N$ two-level systems or spins interacting with two photonic cavity modes, where one of the modes is in the dispersive regime. In contrast to Dicke batteries, the power enhanc...
Lower Bounding the Secret Key Capacity of Bosonic Gaussian Channels via Optimal Gaussian Measurements
Giuseppe Ortolano, Stefano Pirandola, Leonardo Banchi·Dec 17, 2025
We find the maximum rate achievable in the private communication over a bosonic quantum channel with a fully Gaussian protocol based on optimal single-mode Gaussian measurements. This rate establishes a lower bound on the secret rate capacity of the ...
The inverse parametric problem
Michele Cortinovis, Fabio Lingua, David B. Haviland·Dec 17, 2025
We present a method to calculate the frequency components of a pump waveform driving a parametric oscillator, which realizes a desired frequency mixing or scattering between modes. The method is validated by numerical analysis and we study its sensit...
A short history of Quantum Illumination
Marco Genovese, Ivano Ruo-Berchera·Dec 17, 2025
Quantum illumination represents one of the most interesting examples of quantum technologies. On the one hand, it can find significant applications; on the other hand, it is one of the few quantum protocols robust against noise and losses. Here we pr...