Article
Nanoscience & Nanotechnology
Liang Zhai, Giang N. Nguyen, Clemens Spinnler, Julian Ritzmann, Matthias C. Loebl, Andreas D. Wieck, Arne Ludwig, Alisa Javadi, Richard J. Warburton
Summary: This study demonstrates two-photon interference with near-unity visibility using photons from two different GaAs quantum dots, achieving a visibility of 93.0% ± 0.8%. By leveraging quantum interference, a photonic controlled-not circuit and entanglement with fidelity of 85.0% ± 1.0% between photons of different origins were achieved.
NATURE NANOTECHNOLOGY
(2022)
Article
Multidisciplinary Sciences
Tomasz Bigaj
Summary: This article proposes an unconventional approach to the individuation of quantum particles of the same type, using physically meaningful projection operators instead of unphysical labels. It argues for a modification of the standard notion of entanglement to exclude states resulting merely from symmetrization. The article also discusses recent experiments on measurement-induced entanglement, indicating that they support the new concept of entanglement. Furthermore, it explores the difference between non-entangled but non-factorizable states and ordinary product states.
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2023)
Article
Quantum Science & Technology
Matteo Piccolini, Vittorio Giovannetti, Rosario Lo Franco
Summary: This study proposes a procedure for preparing maximally entangled states of identical fermionic qubits and investigates the role of particle statistics in the process. The protocol uses noisy channels to reset the system and generates a mixture of maximally entangled Bell states and NOON states through interference effects. It also demonstrates how any maximally entangled state of two fermionic qubits can be obtained from each other through passive optical transformations.
ADVANCED QUANTUM TECHNOLOGIES
(2023)
Article
Physics, Multidisciplinary
Matteo Piccolini, Farzam Nosrati, Giuseppe Compagno, Patrizia Livreri, Roberto Morandotti, Rosario Lo Franco
Summary: In this study, by leveraging the spatial indistinguishability of identical subsystems, we partially recovered the quantum entanglement disrupted by environmental noise. The research findings demonstrate that the recovery of entanglement is related to the spatial indistinguishability achieved through waveform deformation and localized operations.
Article
Physics, Multidisciplinary
Fabio Benatti, Roberto Floreanini, Ugo Marzolino
Summary: The study explores the role of entanglement and non-locality in quantum protocols with identical particles systems. Second quantization formalism is found to be the only approach that avoids inconsistencies and paradoxes. Inconsistencies arise when entanglement and non-locality are forced to be properties of the identical particles rather than the modes they can occupy.
Article
Quantum Science & Technology
Seungbeom Chin, Jung-Hoon Chun
Summary: This work presents a comprehensive approach to analyzing entanglement between subsystems generated by identical particles using SEA and microcausality, while amending the NLA method for quantifying entanglement of any type of identical particles, especially fermions with the parity superselection rule. The formal correspondence between identical and non-identical particle systems is useful for quantifying non-locality generated by identical particles, such as the violation of the maximal CHSH inequality and the GHJW theorem of identical particles.
QUANTUM INFORMATION PROCESSING
(2021)
Article
Optics
Donghwa Lee, Tanumoy Pramanik, Seongjin Hong, Young-Wook Cho, Hyang-Tag Lim, Seungbeom Chin, Yong-Su Kim
Summary: This work proposes schemes to generate two fundamental classes of genuine tripartite entanglement using linear optics and demonstrates their experimental feasibility with three identical photons. The results support the prediction that particle indistinguishability is a fundamental element for entangling identical particles.
Article
Optics
Zhen Yang, Junya Yang, Shi-Lei Chao, Chengsong Zhao, Rui Peng, Ling Zhou
Summary: A scheme for simultaneously cooling multiple identical mechanical oscillators is proposed, where the frequency of one oscillator is designed using Lyapunov control. By effectively coupling the dark mode with the bright mode, the two identical oscillators can be simultaneously cooled to their ground state. This scheme can also be extended to achieve simultaneous cooling of multiple identical mechanical oscillators.
Article
Thermodynamics
Hope A. Michelsen, Emeric Boigne, Paul E. Schrader, K. Olof Johansson, Matthew F. Campbell, Ray P. Bambha, Matthias Ihme
Summary: We have developed a new method for extracting particulates and gas-phase species from flames by directing a small jet of inert gas through the flame to collect the sample. This approach allows for quenching and diluting the sample during extraction while minimizing the perturbations to the flame. Experimental results, TEM analysis, and numerical simulations demonstrate the significant advantages of this jet-entrainment sampling technique.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2023)
Article
Optics
J. Sanchez-Canovas, M. Donaire
Summary: The study investigates the conservative van der Waals forces between two atoms in the limit of identical atoms, revealing the importance of a time-dependent approach in the weak-interaction regime. The resultant force is significantly stronger than that found in dissimilar atoms, raising the possibility of experimental detection. The timedependent conservative forces cannot be expressed as the gradients of the expectation values of the interaction potentials, setting them apart from the usual stationary van der Waals forces.
Article
Mathematics, Interdisciplinary Applications
A-B A. Mohamed, H. A. Hessian, A-S F. Obada
Summary: This paper analytically explores the dynamics of a nonlinear two-qubit system derived from a physical model that describes laser-irradiated two trapped particles in the Lamb-Dicke regime. It investigates the effect of Lamb-Dicke parameter and intrinsic decoherence on particle population inversion, entanglement between trapped particles and their center-of-mass modes, as well as entanglement between trapped particles. The study shows that increasing the Lamb-Dicke parameter can enhance the generated entanglement, but the effects of Lamb-Dicke nonlinearity and intrinsic decoherence become more pronounced with larger values.
CHAOS SOLITONS & FRACTALS
(2021)
Review
Astronomy & Astrophysics
Pan Li, Yi Ling, Zhangping Yu
Summary: We investigate the generation rate of quantum gravity induced entanglement of masses (QGEM) in setups with multiple quantum massive particles, among which only the gravity interaction due to the Newton potential is taken into account. When the distance between any two adjacent Stern-Gerlach devices is fixed, we consider all the possible configurations of the setup with the same number of particles. We find that the prism setup with a massive particle at the center is the most efficient setup for the entanglement generation.
Article
Computer Science, Theory & Methods
Cagan Aksak, Sadi Turgut
Summary: The discussion in the passage mainly focuses on quantum correlations and entanglement in identical-particle systems, introducing an approach based on witness formalism to detect pairing relationships, and discussing separability bounds and their different definitions' impact on bosonic systems.
QUANTUM INFORMATION & COMPUTATION
(2021)
Article
Physics, Multidisciplinary
Alberto Casado, Santiago Guerra
Summary: This paper investigates the relationship between the Bell-state measurement and extracting phase information from the zero-point field. The Wigner representation in the Heisenberg picture is applied in a Bell-type experiment, where the polarisation-entangled photon pairs generated do not overlap. Signal intensities at the detectors are calculated in a four-mode approximation, expressed as functions of the modules and phases of the four zero-point amplitudes. A criterion for identifying correlated detectors is proposed based on the equality of the signal intensities, without involving the calculation of joint detection probabilities. Analysis in different bases shows that the distinguishability of the polarisation Bell states is related to the knowledge of the phases of the vacuum field entering the entanglement source.
Article
Physics, Multidisciplinary
Sebastian Horvat, Borivoje Dakic
Summary: This paper presents and analyzes an information-theoretic task related to learning information by moving particles. The study shows that the task can only be solved when the particles are in particular states. Furthermore, the task does not require any spatial overlap between particles.
NEW JOURNAL OF PHYSICS
(2023)
Article
Chemistry, Physical
Clemens Vittmann, R. Kevin Kessing, James Lim, Susana F. Huelga, Martin B. Plenio
Summary: This study investigates the nonequilibrium dynamics of electron transmission from a straight waveguide to a helix with spin-orbit coupling. Transmission is found to be spin-selective, leading to large spin polarizations of the itinerant electrons. The degree of spin selectivity depends on the width of the interface region, and no polarization is observed for single-point couplings. The study identifies interface structure and conservation of momentum as crucial factors for chiral-induced spin selectivity, and confirms the robustness of this mechanism against static disorder.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Physics, Multidisciplinary
Eldad Bettelheim, Aditya Banerjee, Martin B. Plenio, Susana F. Huelga
Summary: The statistical mechanics characterization of finite subsystems embedded in an infinite system is a fundamental question in quantum physics. In this study, a mathematical framework based on the Riemann-Hilbert approach is developed to address this problem in the one-dimensional case, where the finite system consists of two disjoint intervals and is analyzed in the thermodynamic limit. The method is demonstrated to be useful for computing the change in the entanglement and negativity spectra, providing insights into the quantum correlation structure and extent in fermionic systems subject to local environments.
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2022)
Article
Astronomy & Astrophysics
Kirill Streltsov, Julen Simon Pedernales, Martin Bodo Plenio
Summary: In this study, we investigate the interaction between a harmonic oscillator and a two-level test mass mediated by a local operations and classical communication channel. We demonstrate that a signature, claimed to be exclusive to channels that can transmit quantum information, is generated. By providing an explicit example based on a measurement-and-feedback channel, we explain the failure of the previous proof and discuss the potential applications of setups of this type in testing the nature of gravitational interaction and the fundamental implications an LOCC model of gravity may have in black hole physics.
Article
Physics, Multidisciplinary
Julen S. Pedernales, Kirill Streltsov, Martin B. Plenio
Summary: Feynman suggested in 1957 that the quantum or classical nature of gravity can be evaluated through testing the gravitational interaction of source masses in superposition. However, the weakness of this interaction in proposed matter-wave interferometry experiments requires special initial states. This study tackles the challenge by using a massive body as an amplifying mediator, resulting in a stronger and independent interaction between test systems.
PHYSICAL REVIEW LETTERS
(2022)
Article
Multidisciplinary Sciences
F. Caycedo-Soler, A. Mattioni, J. Lim, T. Renger, S. F. Huelga, M. B. Plenio
Summary: Numerically exact simulations reveal that multimode vibronic mixing in model photosynthetic systems strongly affects optical responses and facilitates coherent dynamics. The generation, transport, and trapping of excitons in pigment-protein complexes (PPCs) are crucial for photosynthesis. The inclusion of full multi-mode vibronic dynamics in numerical calculations of linear spectra leads to significant corrections to electronic parameter estimation. These effects are relevant to the discussion on the origin of long-lived oscillations in multidimensional nonlinear spectra.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Mathematical
Giovanni Ferrari, Ludovico Lami, Thomas Theurer, Martin B. Plenio
Summary: In this study, we examine asymptotic state transformations in continuous variable quantum resource theories. We prove that lower semicontinuity and strong superadditivity can be used to bound asymptotic transformation rates in these settings. We provide applications to optical nonclassicality, entanglement, and quantum thermodynamics resource theories. Our findings offer computable upper bounds for asymptotic transformation rates, including those achievable with linear optical elements.
COMMUNICATIONS IN MATHEMATICAL PHYSICS
(2023)
Article
Chemistry, Physical
Clemens Vittmann, James Lim, Dario Tamascelli, Susana F. Huelga, Martin B. Plenio
Summary: This study examines the role of delocalized phonon modes in electron transport in chiral structures and demonstrates that spin selectivity can originate from spin-dependent energy and momentum conservation in electron-phonon scattering events. The degree of spin polarization, however, depends on environmental factors and the presence of external driving fields. The parametric dependence allows for experimentally testable predictions of the model.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Mathematics, Applied
Andrea Smirne, Dario Tamascelli, James Lim, Martin B. Plenio, Susana F. Huelga
Summary: In this study, we determine the conditions for the equivalence between the multi-time expectation values of a general finite-dimensional open quantum system when interacting with different environments. This non-perturbative evaluation of multi-time expectation values allows for the investigation of open-system multi-time quantities in fully general regimes.
OPEN SYSTEMS & INFORMATION DYNAMICS
(2022)
Article
Quantum Science & Technology
C. Munuera-Javaloy, R. Puebla, B. D'Anjou, M. B. Plenio, J. Casanova
Summary: This article presents a new method for detecting molecular conformational changes using nitroxide electron-spin labels and a nitrogen-vacancy center in diamond. By applying microwave and radiofrequency pulses carefully, stable nitroxide resonances can be achieved. The article also proposes an optimized scheme by using nitroxides with distinct nitrogen isotopes. Additionally, a simple theoretical model is developed and combined with Bayesian inference techniques to demonstrate the ability to detect conformational changes in ambient conditions and extract inter-label distances using the residual effect of random molecular tumbling.
NPJ QUANTUM INFORMATION
(2022)
Article
Physics, Multidisciplinary
Patrick Barthel, Patrick H. Huber, Jorge Casanova, Inigo Arrazola, Dorna Niroomand, Theeraphot Sriarunothai, Martin B. Plenio, Christof Wunderlich
Summary: We demonstrate the experimental implementation of a two-qubit phase gate using a radio frequency controlled trapped-ion quantum processor. The gate is generated by applying a pulsed dynamical decoupling sequence to the ions' carrier transitions, allowing for tunable and high-fidelity phase shift. The gate's performance is robust against various sources of error and holds potential for fast gate speeds.
NEW JOURNAL OF PHYSICS
(2023)
Article
Physics, Multidisciplinary
Alejandro D. Somoza, Nicola Lorenzoni, James Lim, Susana F. Huelga, Martin B. Plenio
Summary: The role of vibrational motion in the charge dynamics of donor-acceptor networks in organic photovoltaics is investigated using non-perturbative simulations. The study addresses the challenge of simulating large electronic-vibrational systems and identifies conditions under which underdamped vibrational motion induces efficient charge separation. The results provide insights into coupling mechanisms and the role of entropic effects, offering a toolbox for designing efficient charge separation pathways in artificial nanostructures.
COMMUNICATIONS PHYSICS
(2023)
Article
Physics, Multidisciplinary
Alastair Marshall, Thomas Reisser, Phila Rembold, Christoph Mueller, Jochen Scheuer, Martin Gierse, Tim Eichhorn, Jakob M. Steiner, Patrick Hautle, Tommaso Calarco, Fedor Jelezko, Martin B. Plenio, Simone Montangero, Ilai Schwartz, Matthias M. Mueller, Philipp Neumann
Summary: This paper utilizes photoexcited triplet state of pentacene-doped naphthalene crystals to polarize surrounding protons and enhance nuclear magnetic resonance signals. Optimal control pulses designed with REDCRAB and a strategy called ARISE are introduced to improve the performance of hyperpolarization sequences.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Optics
Julen S. Pedernales, Martin B. Plenio
Summary: This study designs a method that utilizes spatial correlations to reduce the impact of perturbations from distant sources on the visibility of matter-wave interference patterns, and develops a general framework for correcting the multipole expansion of environmental potential fields. This method works for stochastic field fluctuations at any timescale and does not require quantum correlations.
Article
Quantum Science & Technology
Theodoros Ilias, Dayou Yang, Susana F. Huelga, Martin B. Plenio
Summary: This study proposes a protocol for criticality-enhanced sensing by continuously observing the emitted radiation quanta. The study establishes a scaling theory for the global quantum Fisher information and derives universal scaling laws related to critical exponents. The findings suggest that the precision scaling of continuous detection of emitted quanta exceeds that of direct measurement, indicating the metrological value of this approach in dissipative criticality.
Article
Optics
Giovanni Spaventa, Susana F. Huelga, Martin B. Plenio
Summary: This study combines the concepts of quantum resource theory and divisibility classes of quantum channels to prove that memory effects can increase the efficiency of photoisomerization, which is not achievable under purely thermal Markovian evolution. This provides rigorous evidence that memory effects can serve as a resource in quantum thermodynamics at the nanoscale.