Papers
Experimental investigation of the effect of dispersion on squeezing generation in a synchronously pumped optical parametric oscillator
Edoardo Suerra, Samuele Altilia, Stefano Olivares +4 more·Feb 26, 2026
An experimental investigation of intracavity dispersion effects in a synchronously pumped optical parametric oscillator (SPOPO) is presented. A flexible setup combining spectral and phase shaping of both pump and local oscillator fields with frequenc...
Quantum squeezing in an all-resonant periodically poled lithium niobate microresonator
Xinyi Ren, Reshma Kopparapu, Tushar Sanjay Karnik +12 more·Feb 26, 2026
Quantum noise limits the sensitivity of optical measurements, but squeezed states of light enable quantum-enhanced metrology, sensing, and information processing. Most on-chip squeezed-light sources rely on Kerr ($χ^{(3)}$) nonlinearities, remain lim...
Schwinger-Keldysh field theory for operator Rényi entropy and entanglement growth in non-interacting systems with sub-ballistic transports
Priesh Roy, Sumilan Banerjee·Feb 25, 2026
The notion of operator growth in quantum systems furnishes a bridge between transport and the generation of entanglement between different parts of the system under quantum dynamics. We define a measure of operator growth in terms of subsystem operat...
Tuning Wave-Particle Duality of Quantum Light by Generalized Photon Subtraction
Kan Takase, Mamoru Endo, Fumiya Hanamura +11 more·Feb 25, 2026
Wave--particle duality is a hallmark of quantum mechanics. For bosonic systems, there exists a continuum of intermediate states bridging wave-like Schrödinger cat states and particle-like Fock states. Such states have recently been recognized as valu...
Coupling nitrogen vacancy centers in silicon carbide to nanophotonic resonators
Ivan Zhigulin, Konosuke Shimazaki, Samuel M. Stephens +5 more·Feb 25, 2026
Silicon carbide (SiC) is a promising platform for scalable quantum technologies owing to its well-established, wafer-scale industrial processing. SiC also hosts a variety of optically active color centres including the nitrogen vacancy defect that ha...
Optical repumping and atom number balancing in a two-color MOT
Shubha Deutschle, Lőrinc Sárkány, Milán János Negyedi +3 more·Feb 24, 2026
We study a novel repumping transition for $^{88}$Sr atoms trapped in a 'blue' magneto-optical trap. We show that, while the repumping efficiency is about three orders of magnitude smaller than for traditional schemes, it is sufficient for recycling a...
Topological Floquet Green's function zeros
Elio J. König, Aditi Mitra·Feb 24, 2026
Motivated by recent advances in digital quantum emulation using noisy intermediate-scale quantum (NISQ) devices and an increased interest in topological Green's function zeros in condensed matter systems, we here study Green's function zeros in topol...
Quantum geometry-driven photogalvanic responses in semi-Dirac systems
Bristi Ghosh, Malay Bandyopadhyay, Snehasish Nandy·Feb 24, 2026
The photogalvanic effect (PGE), a fundamental nonlinear optical phenomenon in non-centrosymmetric materials, generates direct photocurrent under polarized light. Using quantum kinetic theory within the relaxation-time approximation, we theoretically ...
Generative Deep Learning for the Two-Dimensional Quantum Rotor Model
Yanyang Wang, Feng Gao, Kui Tuo +1 more·Feb 24, 2026
The advancement of diverse generative deep learning models and their variants has furnished substantial insights for investigating quantum many-body problems. In this work, we design two models based on the foundational architecture of generative adv...
Nonlinear quantum optomechanics in a Fano-mirror microcavity system
Lei Du, Juliette Monsel, Witlef Wieczorek +1 more·Feb 23, 2026
We study a Fano-mirror optomechanical system in the quantum nonlinear regime. In this system, two strongly lossy optical modes hybridize through both coherent and dissipative couplings to form an effective optical mode with a drastically reduced line...
Entanglement formation in two-dimensional materials within microcavity
Fabricio Danel Matias, Facundo Arreyes, Juan Sebastián Ardenghi·Feb 23, 2026
In this work, the entanglement generation between two hexagonal-lattice layers embedded in a microcavity is studied, accounting for both electromagnetic coupling and intrinsic spin-orbit interaction (SOI). Utilizing a short-time dynamical approach, w...
Separation of the Kibble-Zurek Mechanism from Quantum Criticality
R. Jafari, Alireza Akbari·Feb 23, 2026
When a system is swept through a quantum critical point (QCP), the Kibble-Zurek mechanism predicts that the average number of topological defects follows a universal power-law scaling with the ramp time scale. This scaling behavior is determined by t...
Co-Propagation of Quantum Time Synchronization and Optical Frequency Transfer over a 122 km Hollow-Core Fiber
Huibo Hong, Xiao Xiang, Runai Quan +15 more·Feb 22, 2026
The co-propagation of quantum and classical signals through shared optical fibers is crucial for scalable quantum networks. However, this coexistence is fundamentally limited by spontaneous Raman scattering (SpRS) from the bright classical light, whi...
High-quality single photons from cavity-enhanced biexciton-to-exciton transition
Nils Heinisch, Francesco Salusti, Mark R. Hogg +7 more·Feb 20, 2026
Resonant laser excitation of a two-level system with subsequent single-photon emission can be used to generate single photons with high indistinguishability or Hong-Ou-Mandel (HOM) visibility. However, spectral overlap between excitation laser and em...
Comparison of security mechanisms of Mathematical cipher, Wyner scheme, QKD, and Quantum stream cipher
Gikyu Yamamoto, Osamu Hirota·Feb 20, 2026
A new generation of global communications technology has been emerging. These systems, which utilize established device technologies and quantum effect devices, require ultra-high speeds, low cost, and strong security. In recent years, global communi...
Experimental certification of ensembles of high-dimensional quantum states with independent quantum devices
Yong-Nan Sun, Meng-Yun Ma, Qi-Ping Su +3 more·Feb 19, 2026
When increasing the dimensionality of quantum systems, high-dimensional quantum state certification becomes important in quantum information science and technology. However, how to certify ensembles of high-dimensional quantum states in a black-box s...
Intermodal quantum key distribution over an 18 km free-space channel with adaptive optics and room-temperature detectors
Edoardo Rossi, Ilektra Karakosta-Amarantidou, Matteo Padovan +9 more·Feb 18, 2026
Intermodal quantum key distribution at telecom wavelengths provides a hybrid interface between fiber connections and free-space links, both essential for the realization of scalable and interoperable quantum networks. Although demonstrated over short...
Quantitative study of Silicon Waveguides for the Generation of Quantum Correlated Photon Pairs Bridging Mid-Infrared and Telecom Bands
Abhishek Kumar Pandey, Deepak Jain, Catherine Baskiotis·Feb 18, 2026
Sources of quantum correlated photons pairs bridging the 3um-4um Mid-infrared (MIR) band and Telecom/Near-Infrared/Visible band are of high importance for quantum technologies. Spontaneous Parametric Down Conversion is generally used for realizing su...
Edge states and quantum optical high-harmonic generation from topological insulators
Christian Saugbjerg Lange, Lars Bojer Madsen·Feb 18, 2026
The strong-field process of high-harmonic generation (HHG) has, in recent years, been treated from a quantum optical perspective in the emerging research area of strong-field quantum optics. These investigations show that HHG radiation is, in general...
DistributedEstimator: Distributed Training of Quantum Neural Networks via Circuit Cutting
Prabhjot Singh, Adel N. Toosi, Rajkumar Buyya·Feb 18, 2026
Circuit cutting decomposes a large quantum circuit into a collection of smaller subcircuits. The outputs of these subcircuits are then classically reconstructed to recover the original expectation values. While prior work characterises cutting overhe...