Article
Quantum Science & Technology
Alysson Gold, J. P. Paquette, Anna Stockklauser, Matthew J. Reagor, M. Sohaib Alam, Andrew Bestwick, Nicolas Didier, Ani Nersisyan, Feyza Oruc, Armin Razavi, Ben Scharmann, Eyob A. Sete, Biswajit Sur, Davide Venturelli, Cody James Winkleblack, Filip Wudarski, Mike Harburn, Chad Rigetti
Summary: The study demonstrates a modular solid state architecture with deterministic coupling between four physically separate superconducting qubit integrated circuits, achieving high fidelity two-qubit gates. The quality of inter-module entanglement is confirmed, laying the technological foundations for a modular quantum processor.
NPJ QUANTUM INFORMATION
(2021)
Article
Multidisciplinary Sciences
Tim van Leent, Matthias Bock, Florian Fertig, Robert Garthoff, Sebastian Eppelt, Yiru Zhou, Pooja Malik, Matthias Seubert, Tobias Bauer, Wenjamin Rosenfeld, Wei Zhang, Christoph Becher, Harald Weinfurter
Summary: This paper demonstrates the feasibility of distributing heralded entanglement over telecom fiber links, which is an important step towards the realization of large-scale quantum network links.
Article
Physics, Multidisciplinary
Matteo Fadel, Ayaka Usui, Marcus Huber, Nicolai Friis, Giuseppe Vitagliano
Summary: This method offers a practical way to measure entanglement in experiments, especially in situations with limited observable measurements, such as quantifying entanglement using measurements of the first and second moments of the collective spin operator.
PHYSICAL REVIEW LETTERS
(2021)
Article
Chemistry, Physical
Laura Bancroft, Yunfan Qiu, Matthew D. Krzyaniak, Michael R. Wasielewski
Summary: The study demonstrated photodriven quantum teleportation of an electron spin state in a covalent donor-acceptor-radical system. Varying the time between spin state preparation and photoinitiated teleportation had effects on the results, with oscillatory behavior observed. Understanding experimental parameters is crucial for leveraging this phenomenon for quantum information applications.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Optics
C. Seida, A. El Allati, N. Metwally, Y. Hassouni
Summary: A three-party bidirectional teleportation scheme is proposed in the paper, where users share a maximally entangled three qubits state. The fidelity of the teleported state depends on various factors, including the nature of the teleported information and the phase angles of the states involved. The possibility of teleporting classical information is higher than quantum information, and there is discussion on generalizing the protocol to more users in a quantum network.
Article
Multidisciplinary Sciences
Matthias J. J. Bayerbach, Simone E. E. D'Aurelio, Peter van Loock, Stefanie Barz
Summary: Bell-state projections are fundamental for most quantum communication and computing protocols, but current measurement schemes can only identify two out of four Bell states with a maximum success probability of 50%. In this study, we experimentally demonstrate a scheme that increases the success probability to 62.5% by using additional ancillary photons. The experimental results show a substantial improvement with a success probability of (57.9 ± 1.4)%. This work has the potential to lead to more efficient implementations of quantum technologies based on Bell-state measurements by extending the protocol to include a larger number of ancillary photons.
Article
Physics, Multidisciplinary
Jacob L. Beckey, N. Gigena, Patrick J. Coles, M. Cerezo
Summary: In this work, a family of multipartite entanglement measures called concentratable entanglements is introduced, providing a general framework for quantifying multipartite entanglement. These measures do not increase, on average, under local operations and classical communications, and have an operational meaning in terms of probabilistic concentration of entanglement into Bell pairs. Furthermore, these measures can be efficiently estimated on a quantum computer through a parallelized SWAP test, paving the way for measuring multipartite entanglement on quantum devices.
PHYSICAL REVIEW LETTERS
(2021)
Article
Quantum Science & Technology
Tomoki Yamagami, Etsuo Segawa, Norio Konno
Summary: The study extends the scheme of quantum teleportation by quantum walks and introduces the mathematical definition and necessary conditions for achieving quantum teleportation rigorously. The results classify the parameters necessary for the successful accomplishment of quantum teleportation.
QUANTUM INFORMATION PROCESSING
(2021)
Article
Physics, Multidisciplinary
Caterina Vigliar, Stefano Paesani, Yunhong Ding, Jeremy C. Adcock, Jianwei Wang, Sam Morley-Short, Davide Bacco, Leif K. Oxenlowe, Mark G. Thompson, John G. Rarity, Anthony Laing
Summary: Error-protection schemes can increase the success rate of quantum algorithms. General-purpose quantum computers can entangle noisy physical qubits to protect against errors. Measurement-based quantum computing architectures are the most viable approach for constructing an all-photonic quantum computer.
Article
Optics
Sofiane Merkouche, Valerian Thiel, Brian J. Smith
Summary: The article discusses the probabilistic splitting and combining of photons in spontaneous parametric down conversion and sum-frequency generation processes, as well as the impact of single-photon projective measurement on the input state in a two-photon SFG process. Using positive operator-valued measure, it is shown the correlation between two-photon states and the states produced by the PDC process.
Article
Nanoscience & Nanotechnology
Baptiste Jadot, Pierre-Andre Mortemousque, Emmanuel Chanrion, Vivien Thiney, Arne Ludwig, Andreas D. Wieck, Matias Urdampilleta, Christopher Bauerle, Tristan Meunier
Summary: The use of surface acoustic waves to displace two entangled spins while maintaining entanglement over a distance of 6 micrometers provides a pathway for fast on-chip deterministic interconnection of remote quantum bits in semiconductor quantum circuits. This work showcases the potential for long-distance entanglement of spin qubits in semiconductors to enable connectivity of quantum core units for networked quantum computing.
NATURE NANOTECHNOLOGY
(2021)
Article
Physics, Applied
Si-Yu Xiong, Liang Tang, Qun Zhang, Dan Xue, Ming-Qiang Bai, Zhi-Wen Mo
Summary: In this paper, we discuss short-distance teleportation and propose bidirectional, rotation, and cyclic rotation teleportation schemes. These schemes have certain advantages in saving quantum resources.
MODERN PHYSICS LETTERS B
(2022)
Article
Multidisciplinary Sciences
Bohan Li, Aritra Das, Spyros Tserkis, Prineha Narang, Ping Koy Lam, Syed M. Assad
Summary: The maximum entanglement achievable through passive transformations by continuous-variable states is called the entanglement potential. Recent research indicates that the entanglement potential can be upper-bounded by a simple function of squeezing of formation. Certain classes of two-mode Gaussian states can saturate this bound, but it remains an open problem for the general case. In this study, a larger class of states is introduced that is proven to saturate the bound, and it is conjectured that all two-mode Gaussian states can be passively transformed into this class, thereby equating entanglement potential with squeezing of formation. An explicit algorithm for the passive transformations is provided, and extensive numerical testing is performed to support this claim, aiming to unify the resource theories of two characteristic quantum properties of continuous-variable systems.
SCIENTIFIC REPORTS
(2023)
Article
Multidisciplinary Sciences
Mingjian He, Robert Malaney
Summary: In this study, a new CV-based teleportation protocol is explored to improve the transfer of hybrid entangled states. The modified protocol shows significant improvement over traditional CV teleportation for both DV qubits and CV qubits. Additionally, the use of non-Gaussian operations with quantum scissors provides the most improvement in loss tolerance.
SCIENTIFIC REPORTS
(2022)
Article
Physics, Multidisciplinary
Zhou Yao-Yao, Liu Yan-Hong, Yan Zhi-Hui, Jia Xiao-Jun
Summary: Quantum teleportation is a fundamental quantum protocol that transfers an unknown quantum state from one location to another using shared quantum entanglement without physically transferring the information carrier. With the advancement of quantum information research, multipartite quantum protocols are expected to play a fundamental role in larger-scale quantum communication and computation.
ACTA PHYSICA SINICA
(2021)
Article
Physics, Multidisciplinary
R. Nery, M. M. Taddei, P. Sahium, S. P. Walborn, L. Aolita, G. H. Aguilar
PHYSICAL REVIEW LETTERS
(2020)
Article
Physics, Applied
G. H. Aguilar, R. S. Piera, P. L. Saldanha, R. L. de Matos Filho, S. P. Walborn
PHYSICAL REVIEW APPLIED
(2020)
Article
Optics
Xiaojun Cheng, Edbert J. Sie, David A. Boas, Francesco Marsili
Summary: fNIRS is a non-invasive method for measuring human brain function, and selecting the optimal wavelength is crucial for improving its performance. Research found that the wavelength around 830 nm exhibits the largest change in detected fluence during neural activation in a predefined local region.
Article
Optics
P. Lefebvre, R. Valivarthi, Q. Zhou, L. Oesterling, D. Oblak, W. Tittel
Summary: This paper presents a compact energy-time entangled photon pair source at telecom wavelengths achieved through cascaded second harmonic generation and spontaneous parametric down conversion, with methods introduced to diminish the effects of Raman scattering. The quality of energy-time entanglement produced by the source is analyzed using two-photon interference and Franson interference, with high visibilities of 93.9% +/- 0.4% and 90.5% +/- 0.6% achieved.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2021)
Article
Quantum Science & Technology
M. M. Taddei, T. L. Silva, R. Nery, G. H. Aguilar, S. P. Walborn, L. Aolita
Summary: The study finds that there may be a contradictory effect in the standard definition of multipartite steering, where entanglement can be created in the system through local operations but has not been experimentally confirmed. By redefining this concept, operational consistency is reestablished, and hidden entanglement properties are revealed. In addition, there are protocols that can reveal entanglement and Bell nonlocality in seemingly unsteerable systems.
NPJ QUANTUM INFORMATION
(2021)
Article
Neurosciences
Xiaojun Cheng, Edbert J. Sie, Stephanie Naufel, David A. Boas, Francesco Marsili
Summary: The study aims to characterize DCS signal variation in detecting neuronal cell activity on fast and slow timescales. Through Monte Carlo simulations, it was found that neuronal cell motion induces DCS signal changes, but based on current technology trends, the detection of neuronal cell motion using DCS is not expected in the near future.
Article
Physics, Multidisciplinary
Mohsen Falamarzi Askarani, Antariksha Das, Jacob H. Davidson, Gustavo C. Amaral, Neil Sinclair, Joshua A. Slater, Sara Marzban, Charles W. Thiel, Rufus L. Cone, Daniel Oblak, Wolfgang Tittel
Summary: The study investigates the optical properties of Tm: Y3Ga5O12 and demonstrates its potential for creating multiplexed quantum memories with long optical storage times. Methods to narrow the gap between measured storage time values and the maximum value are discussed.
PHYSICAL REVIEW LETTERS
(2021)
Article
Biochemical Research Methods
Xiaojun Cheng, Hui Chen, Edbert J. Sie, Francesco Marsili, David A. Boas
Summary: This study aims to establish a model to simulate TD-DCS measurements from first principles and analyze the impact of measurement noise to quantify the system performance. The model combines Monte Carlo simulation with the wave model to simulate photon scattering in biological tissue.
JOURNAL OF BIOMEDICAL OPTICS
(2022)
Article
Psychology, Educational
Francesco Marsili, Marta Pellegrini
Summary: This meta-analysis examines the relations between nominations and traditional measures, as well as the relations among four forms of nominations. The results show that there is a positive correlation between nominations and traditional measures, and the type of traditional measure and school level can affect this correlation.
SCHOOL PSYCHOLOGY INTERNATIONAL
(2022)
Article
Biochemical Research Methods
Sharvari Zilpelwar, Edbert j. Sie, Dmitry Postnov, Anderson Ichun Chen, Bernhard Zimmermann, Francesco Marsili, David A. Boas, Xiaojun Cheng
Summary: In this study, a dynamic speckle model (DSM) is introduced to simulate the temporal evolution of fully developed speckle patterns caused by scattered light reemitted from dynamic tissue. Using this model, the performance of laser speckle contrast imaging (LSCI) or speckle contrast optical spectroscopy (SCOS) systems, which quantify tissue dynamics using the spatial contrast of the speckle patterns with a certain camera exposure time, is evaluated. Noise sources arising from speckle statistics and experimental conditions are investigated, and an analytical noise model is calibrated and validated experimentally. The findings provide design principles for LSCI or SCOS systems that monitor human brain blood flow and functions.
BIOMEDICAL OPTICS EXPRESS
(2022)
Review
Education & Educational Research
Francesco Marsili, Silvia Dell'Anna, Marta Pellegrini
Summary: This systematic review investigates the outcomes of gifted students in inclusive school settings. Results show mixed social and psychological outcomes, with positive relationships with peers but potential frustration and disengagement due to teaching inadequacy. In terms of learning outcomes, the difference between inclusive and segregated contexts is inconsistent and mostly non-statistically significant.
INTERNATIONAL JOURNAL OF INCLUSIVE EDUCATION
(2023)
Article
Materials Science, Multidisciplinary
Jacob H. Davidson, Philip J. T. Woodburn, Aaron D. Marsh, Kyle J. Olson, Adam Olivera, Antariksha Das, Mohsen Falamarzi Askarani, Wolfgang Tittel, Rufus L. Cone, Charles W. Thiel
Summary: This study characterizes the magnetic properties of thulium ion energy levels in the Y3Ga5O12 (Tm:YGG) lattice to improve decoherence and reduce linewidth broadening. By measuring hyperfine tensors and analyzing the orientation dependence of the Tm3+ ion's spin Hamiltonian, the research proposes orientations to enhance material properties for light-matter interaction and quantum information applications. Important external field directions identified include extending optical coherence times, improving spin inhomogeneous broadening, maximising mixing of spin states for specific ion sets to enhance optical pumping and lambda systems in the material.
Article
Materials Science, Multidisciplinary
Neil Sinclair, Daniel Oblak, Erhan Saglamyurek, Rufus L. Cone, Charles W. Thiel, Wolfgang Tittel
Summary: The study characterizes the optical coherence and energy-level properties of Tm3+ in a Ti4+ :LiNbO3 waveguide, finding consistency between indiffused Tm-3(+) :Ti-4(+) :LiNbO3 and bulk-doped Tm-3(+) :LiNbO3 crystal properties. These results support the use of rare-earth ions for integrated optical and quantum signal processing, complementing previous research in a narrower parameter space.
Article
Optics
R. S. Piera, S. P. Walborn, G. H. Aguilar
Summary: The experimental investigation reveals that global measurements have advantages in quantum metrology compared to optimized local strategies. Even in cases where the amount of noise is not well characterized, the global strategy can provide unambiguous information about the parameter of interest. The coherence in quantum operations, such as the Bell-state projection device used in the protocol, plays a fundamental role in boosting the quantum advantage in metrology and designing future quantum measurement devices.
Article
Physics, Multidisciplinary
S. P. Walborn, G. H. Aguilar, P. L. Saldanha, L. Davidovich, R. L. de Matos Filho
PHYSICAL REVIEW RESEARCH
(2020)
