More Like this

1. Influence of final state interactions in attosecond photoelectron interferometry

   https://doi.org/10.1103/PhysRevResearch.6.043271  

   Luo, S; Weissenbilder, R; Laurell, H; Bello, R Y; Marante, C; Ammitzböll, M; Neoričić, L; Ljungdahl, A; Squibb, R J; Feifel, R; et al (December 2024, Physical Review Research)

   Fano resonances are ubiquitous phenomena appearing in many fields of physics, e.g., atomic or molecular photoionization, or electron transport in quantum dots. Recently, attosecond interferometric techniques have been used to measure the amplitude and phase of photoelectron wave packets close to Fano resonances in argon and helium, allowing for the retrieval of the temporal dynamics of the photoionization process. In this work, we study the photoionization of argon atoms close to the $3s^{1}3p^{6}4p$autoionizing state using an interferometric technique with high spectral resolution. The phase shows a monotonic $2\pi$variation across the resonance or a nonmonotonic less than $\pi$variation depending on experimental conditions, e.g., the probe laser bandwidth. Using three different, state-of-the-art calculations, we show that the measured phase is influenced by the interaction between final states reached by two-photon transitions. Published by the American Physical Society2024 

   more » « less
2. Efficiently Verifiable Quantum Advantage on Near-Term Analog Quantum Simulators

   https://doi.org/10.1103/PRXQuantum.6.010341  

   Liu, Zhenning; Devulapalli, Dhruv; Hangleiter, Dominik; Liu, Yi-Kai; Kollár, Alicia J; Gorshkov, Alexey V; Childs, Andrew M (March 2025, PRX Quantum)

   Existing schemes for demonstrating quantum computational advantage are subject to various practical restrictions, including the hardness of verification and challenges in experimental implementation. Meanwhile, analog quantum simulators have been realized in many experiments to study novel physics. In this work, we propose a quantum advantage protocol based on verification of an analog quantum simulation, in which the verifier need only run an $O\left({\lambda }^2\right)$-time classical computation, and the prover need only prepare $O\left(1\right)$samples of a history state and perform $O\left({\lambda }^2\right)$single-qubit measurements, for a security parameter $\lambda$. We also propose a near-term feasible strategy for honest provers and discuss potential experimental realizations. Published by the American Physical Society2025 

   more » « less
3. Bayesian Search of Massive Scalar Fields from LIGO-Virgo-KAGRA Binaries

   https://doi.org/10.1103/PhysRevLett.134.191402  

   Xie, Yiqi; Chung, Adrian Ka-Wai; Sotiriou, Thomas P; Yunes, Nicolás (May 2025, Physical Review Letters)

   Massive scalar fields are promising candidates for addressing many unresolved problems in fundamental physics. We report the first model-agnostic Bayesian search of massive scalar fields that are nonminimally coupled to gravity in LIGO/Virgo/KAGRA gravitational-wave data. We find no evidence for such fields and place the most stringent upper limits on their coupling for scalar masses $\lesssim 2\times {10}^{-12}\mathrm{eV}$. We exemplify the strength of these bounds by applying them to massive scalar-Gauss-Bonnet gravity, finding the tightest constraints on the coupling constant to date, $\sqrt{{\alpha }_{\mathrm{GB}}}\lesssim 1\mathrm{km}$for scalar masses $\lesssim {10}^{-13}\mathrm{eV}$to 90% credible level. Published by the American Physical Society2025 

   more » « less
4. Irreducible three-loop vacuum-polarization correction in muonic bound systems

   https://doi.org/10.1103/PhysRevD.111.056016  

   Adkins, Gregory S; Jentschura, Ulrich D (March 2025, Physical Review D)

   Three-loop electronic vacuum-polarization corrections due to irreducible diagrams are evaluated for two-body muonic ions with nuclear charge numbers $1\le Z\le 6$. The corrections are of order ${\alpha }^3(Z\alpha {)}^2{m}_r$, where $\alpha$is the fine-structure constant and $m_r$is the reduced mass. Numerically, the energy corrections are found to be of the same order of magnitude as the largest of the order ${\alpha }^2(Z\alpha {)}^6{m}_r$corrections, and are thus phenomenologically interesting. Our method of calculation eliminates numerical uncertainty encountered in other approaches. Published by the American Physical Society2025 

   more » « less
5. Stochastic ultralight dark matter fluctuations in pulsar timing arrays

   https://doi.org/10.1103/PhysRevD.109.055017  

   Kim, Hyungjin; Mitridate, Andrea (March 2024, Physical Review D)

   Metric perturbations induced by ultralight dark matter (ULDM) fields have long been identified as a potential target for pulsar timing array (PTA) observations. Previous works have focused on the coherent oscillation of metric perturbations at the characteristic frequency set by the ULDM mass. In this work, we show that ULDM fields source low-frequency stochastic metric fluctuations and that these low-frequency fluctuations can produce distinctive detectable signals in PTA data. Using the NANOGrav 12.5-yr dataset and synthetic datasets mimicking present and future PTA capabilities, we show that the current and future PTA observations provide the strongest probe of ULDM density within the Solar System for masses in the range of ${10}^{-18}\mathrm{eV}-{10}^{-16}\mathrm{eV}$. Published by the American Physical Society2024 

   more » « less