Article
Physics, Applied
Xiaodong Qiu, Haoxu Guo, Yuan Ren, Lixiang Chen
Summary: Frequency interface is crucial for various applications, but constructing it for high-dimensional spatial modes is challenging due to the nonuniform nonlinear frequency-conversion efficiency. In this study, we propose a high-dimensional orbital-angular-momentum (OAM) frequency interface by conducting sum-frequency generation between HD OAM states and a radial structured pump. By replacing the conventional Gaussian pump with an optimized coherent superposition of HD Laguerre-Gaussian radial modes, we achieved the OAM frequency interface in nine dimensions with a fidelity up to 90.38%. This high-dimensional frequency interface could be used in free-space optical communication and high-dimensional quantum networks.
PHYSICAL REVIEW APPLIED
(2023)
Article
Physics, Multidisciplinary
Graciana Puentes
Summary: We propose a method for generating entangled photonic states in high dimensions using Orbital Angular Momentum (OAM) entangled photons. By employing diffraction masks, a qudit space can be defined, and the high-dimensional entanglement of path-entangled photons can be quantified using the Concurrence.
FRONTIERS IN PHYSICS
(2022)
Article
Physics, Multidisciplinary
Sebastien Designolle, Vatshal Srivastav, Roope Uola, Natalia Herrera Valencia, Will McCutcheon, Mehul Malik, Nicolas Brunner
Summary: This study theoretically formalizes and experimentally demonstrates a notion of genuine high-dimensional quantum steering, showing that higher-dimensional quantum entanglement can lead to stronger steering. Simple two-setting steering inequalities are derived to certify the presence of genuine high-dimensional steering, based on the connection between steering and incompatibility of quantum measurements. The experimental violation of these inequalities using macropixel photon-pair entanglement certifies genuine high-dimensional steering, with a reported minimum Schmidt number of n = 15 for an entangled state in dimension d = 31.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Xiao-Min Hu, Chao Zhang, Bi-Heng Liu, Yu Guo, Wen-Bo Xing, Cen-Xiao Huang, Yun-Feng Huang, Chuan-Feng Li, Guang-Can Guo
Summary: Violation of Bell's inequalities demonstrates a strong conflict between quantum mechanics and local realism. Loophole-free Bell tests not only enhance understanding of quantum mechanics, but also serve as important foundations for device-independent tasks in quantum information. High-dimensional quantum systems have significant advantages over qubits in closing the detection loophole.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Xiao-Min Hu, Wen-Bo Xing, Yu Guo, Mirjam Weilenmann, Edgar A. Aguilar, Xiaoqin Gao, Bi-Heng Liu, Yun-Feng Huang, Chuan-Feng Li, Guang-Can Guo, Zizhu Wang, Miguel Navascues
Summary: The study introduces a flexible method to construct optimal entanglement detection tests for faithful and unfaithful states, applicable to various experimental techniques. By using protocols generated from this method, researchers successfully experimentally certified two- and three-unfaithful entanglement in four-dimensional photonic states.
PHYSICAL REVIEW LETTERS
(2021)
Article
Optics
Wen-Hao Zhou, Zhi-Qiang Jiao, Hang Li, Jun Gao, Xiao-Wei Wang, Ruo-Jing Ren, Xiao-Yun Xu, Lu-Feng Qiao, Xian-Min Jin
Summary: Researchers propose and experimentally demonstrate heralded multipartite entanglements on a three-dimensional photonic chip. By controlling the coherent evolution of a single photon in multiple spatial modes, they dynamically tune the high-order W-states of different orders in a single photonic chip. Using an effective witness, they observe and verify 61-partite quantum entanglements in a 121-site photonic lattice. These results offer insights into the accessible size of quantum entanglements and may advance large-scale quantum information processing applications.
Article
Optics
Rui Qu, Yunlong Wang, Xiaolin Zhang, Shihao Ru, Feiran Wang, Hong Gao, Fuli Li, Pei Zhang
Summary: The article presents a more robust method for certifying genuine high-dimensional quantum steering in noisy environments, surpassing previous restrictions and demonstrating its practicality through experimental demonstrations.
Article
Optics
Wen-Bo Xing, Xiao-Min Hu, Yu Guo, Bi-Heng Liu, Chuan-Feng Li, Guang-Can Guo
Summary: This study proposes a preparation protocol of multiphoton GHZ state with arbitrary dimensions for optical systems. Auxiliary entanglements realize a high-dimensional entanglement gate to connect the high-dimensional entangled pairs to a multipartite high-dimensional GHZ state. Specifically, we use the path degrees of freedom of photons to prepare a four-partite, three-dimensional GHZ state. Our method can be extended to other degrees of freedom to generate arbitrary GHZ entanglements in any dimension.
Article
Optics
Sebastien Designolle
Summary: Quantum systems of high dimensions have interesting properties in observing entanglement or other forms of correlations, making them attractive for experiments in quantum communication or quantum cryptography due to their improved resistance to noise. However, verifying the high-dimensional nature remains challenging, especially when weak assumptions are made on the parties involved, such as considering one of them as a black box. Recently, the concept of genuine high-dimensional steering has been introduced, allowing for a one-sided device-independent certification of the dimension of a bipartite shared state using only two measurements. In this study, the author overcomes the limitations by developing universal bounds on the incompatibility robustness for more than two measurements, which can serve as meaningful dimension certificates.
Article
Multidisciplinary Sciences
Hsuan-Hao Lu, Karthik Myilswamy, Ryan S. Bennink, Suparna Seshadri, Mohammed S. Alshaykh, Junqiu Liu, Tobias J. Kippenberg, Daniel E. Leaird, Andrew M. Weiner, Joseph M. Lukens
Summary: With the development of integrated biphoton frequency combs, quantum information processing in the frequency domain has attracted more attention in recent years. To address the scalability issue of frequency mixing operations, the authors propose a novel solution that utilizes pulse shapers and electro-optic phase modulators to perform random operations. They successfully verify the entanglement and reconstruct the full density matrix of biphoton frequency combs, achieving the highest dimension for frequency bins to date. The employed Bayesian statistical model can be tailored to various quantum systems with restricted measurement capabilities, providing an opportunistic tomographic framework.
NATURE COMMUNICATIONS
(2022)
Article
Multidisciplinary Sciences
Xiyuan Lu, Mingkang Wang, Feng Zhou, Mikkel Heuck, Wenqi Zhu, Vladimir A. Aksyuk, Dirk R. Englund, Kartik Srinivasan
Summary: The authors demonstrate a method for generating orbital angular momentum (OAM) using photonic crystal ring resonators, while maintaining high cavity quality factors (up to 10^6). By ejecting high angular momentum states of a whispering gallery mode (WGM) microresonator through a grating-assisted mechanism, a scalable and chip-integrated solution for OAM generation is achieved.
NATURE COMMUNICATIONS
(2023)
Article
Physics, Multidisciplinary
Stefano Paesani, Jacob F. F. Bulmer, Alex E. Jones, Raffaele Santagati, Anthony Laing
Summary: The study demonstrates how to generate GHZ states in arbitrary dimensions and numbers of photons using linear optical circuits described by Fourier transform matrices, and how universal linear optical quantum computing can be performed in arbitrary dimensions by combining the results with recent schemes for qudit Bell measurements.
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Shun Takahashi, Takeyoshi Tajiri, Yasuhiko Arakawa, Satoshi Iwamoto, Willem L. Vos
Summary: In this study, we investigate the optical properties of direct and inverse three-dimensional chiral woodpile structures and a corresponding chiral Bragg stack. We compute transmission spectra in the helical direction and observe dual-band circular dichroism. The appearance of circularly polarized gaps can be explained by a physical model involving the corotation or counterrotation of circular polarization with the chiral structure, leading to a spatially dependent or constant refractive index.
Article
Physics, Multidisciplinary
Rui Qu, Yunlong Wang, Min An, Feiran Wang, Quan Quan, Hongrong Li, Hong Gao, Fuli Li, Pei Zhang
Summary: Through experiments, we have demonstrated the stronger correlations and better noise robustness of high-dimensional quantum systems, and shown a method to enhance noise resistance by increasing measurement settings without increasing dimension.
PHYSICAL REVIEW LETTERS
(2022)
Article
Quantum Science & Technology
Yan-Han Yang, Xue Yang, Ming-Xing Luo
Summary: Entanglement of high-dimensional multipartite systems is crucial in both fundamental quantum theory and practical applications. This study proposes a new criterion to characterize genuine entangled states in arbitrary finite dimensional systems, inspired by the genuine high-dimensional entanglement. Two decomposable models are defined using the embedding method to address the issue of untrusted parties in experiments. The study shows the equivalence of local decomposability and embedded decomposability under specific conditions for entangled pure states, while for mixed states, the decomposability may change in the embedded space.
QUANTUM INFORMATION PROCESSING
(2022)
Article
Physics, Multidisciplinary
Simon Morelli, Hayata Yamasaki, Marcus Huber, Armin Tavakoli
Summary: This study investigates entanglement detection in scenarios where local measurements only nearly correspond to the intended measurements. The authors formalize this through an operational notion of inaccuracy that can be estimated directly in the lab. They demonstrate that small magnitudes of inaccuracy can significantly compromise well-known entanglement witnesses.
PHYSICAL REVIEW LETTERS
(2022)
Article
Computer Science, Interdisciplinary Applications
I. Brandao, D. Tandeitnik, T. Guerreiro
Summary: Simulating quantum states on classical computers is difficult, but efficient simulation can be achieved for Gaussian quantum states. In this work, a Python toolbox called QuGIT is introduced, which is based on symplectic methods and specializes in efficient simulation of multimode Gaussian states and operations. QuGIT is exact, does not require truncation of Hilbert space, and provides a wide range of Gaussian operations.
COMPUTER PHYSICS COMMUNICATIONS
(2022)
Article
Physics, Multidisciplinary
Marie Ioannou, Pavel Sekatski, Sebastien Designolle, Benjamin D. M. Jones, Roope Uola, Nicolas Brunner
Summary: This article investigates quantum information compression with respect to a given set of high-dimensional measurements. The notion of simulability is introduced, which demands that the statistics obtained from the measurements and an arbitrary quantum state are exactly recovered through compression and subsequent measurements. The article provides an illustrative example and develops a method for constructing simulation models. It also explores the connection between this approach and other concepts in the context of quantum channels and quantum correlations.
PHYSICAL REVIEW LETTERS
(2022)
Article
Multidisciplinary Sciences
Alexey Tiranov, Vasiliki Angelopoulou, Bjorn Schrinski, Cornelis Jacobus van Diepen, Oliver August Dall Alba Sandberg, Ying Wang, Leonardo Midolo, Sven Scholz, Andreas Dirk Wieck, Arne Ludwig, Anders Sondberg Sorensen, Peter Lodahl
Summary: Photon emission is fundamental for light-matter interaction and photonic quantum science. This study demonstrates distant dipole-dipole radiative coupling in solid-state optical quantum emitters embedded in a nanophotonic waveguide. The collective response and emission dynamics can be controlled by proper excitation techniques. This work is a foundational step towards multiemitter applications for scalable quantum-information processing.
Article
Physics, Multidisciplinary
Vatshal Srivastav, Natalia Herrera Valencia, Will McCutcheon, Saroch Leedumrongwatthanakun, Sebastien Designolle, Roope Uola, Nicolas Brunner, Mehul Malik
Summary: The establishment of quantum nonlocal correlations is crucial for a robust and unconditionally secure quantum network. We introduce a test of quantum steering that utilizes high-dimensional entanglement to be noise robust and loss tolerant. Experimental results demonstrate the significant resource advantages of high-dimensional entanglement in terms of loss, noise, and measurement time for quantum steering.
Article
Multidisciplinary Sciences
Pavel Hrmo, Benjamin Wilhelm, Lukas Gerster, Martin W. van Mourik, Marcus Huber, Rainer Blatt, Philipp Schindler, Thomas Monz, Martin Ringbauer
Summary: Quantum information carriers naturally occupy high-dimensional Hilbert spaces, and high-dimensional (qudit) quantum systems are becoming a powerful resource for quantum processors. Generating the desired interaction efficiently in these systems is crucial. In this study, the authors demonstrate the implementation of a native two-qudit entangling gate up to dimension 5 in a trapped-ion system. They use a light-shift gate mechanism to generate genuine qudit entanglement in a single application of the gate, which seamlessly adapts to the local dimension of the system with a calibration overhead independent of the dimension. Native entangling techniques for qudits are important for encoding quantum information.
NATURE COMMUNICATIONS
(2023)
Article
Physics, Multidisciplinary
Lukas Bulla, Matej Pivoluska, Kristian Hjorth, Oskar Kohout, Jan Lang, Sebastian Ecker, Sebastian P. Neumann, Julius Bittermann, Robert Kindler, Marcus Huber, Martin Bohmann, Rupert Ursin
Summary: Entanglement distribution via photons over long distances enables many applications, including quantum key distribution. The degradation of entanglement remains a challenge due to noise accumulation. This study presents a long-range free-space quantum link that distributes entanglement over 10.2 km with flexible dimensionality of encoding. The approach utilizes high-dimensional entangled photons and analyzes the achievable key rate in a dimensionally adaptive quantum key distribution protocol.
Article
Quantum Science & Technology
L. Nicolas, M. Businger, T. Sanchez Mejia, A. Tiranov, T. Chaneliere, E. Lafitte-Houssat, A. Ferrier, P. Goldner, M. Afzelius
Summary: In this work, a loop-gap microwave resonator is used to simultaneously drive optical and microwave clock transitions in a Yb-171(3+):Y2SiO5 crystal, achieving a Rabi frequency of 0.56 MHz at 2.497 GHz over a 1-cm long crystal. Insights into spin dephasing at very low fields are provided, showing the important role of superhyperfine-induced collapse of the Hahn echo. Manipulation of the effective magnetic moment in Yb-171(3+):Y2SiO5 is demonstrated to suppress the superhyperfine interaction at the clock transition. A spin coherence time of 10.0 +/- 0.4 ms is achieved at a doping concentration of 2 ppm and 3.4 K.
NPJ QUANTUM INFORMATION
(2023)
Article
Quantum Science & Technology
Shuheng Liu, Qiongyi He, Marcus Huber, Otfried Guhne, Giuseppe Vitagliano
Summary: We propose a method to detect the dimensionality of entanglement using correlations between measurements in randomized directions. By deriving an inequality based on the covariance matrix criterion, which is invariant under local changes of su(d) bases, we can find regions in the space of randomized correlations moments that determine the different dimensionalities of entanglement. Our method shows promising results in practical scenarios and can detect more states than existing criteria, making it a powerful and potentially simpler approach. Future work should focus on implementing this method in multipartite scenarios.
Article
Physics, Multidisciplinary
Pavel Sekatski, Sadra Boreiri, Nicolas Brunner
Summary: This study investigates the demonstration of quantum nonlocality in networks with independent sources and proposes a method for self-testing the underlying quantum strategy. By applying these findings to the triangle network, the researchers show that the network exhibits genuine network quantum nonlocality and certifiable randomness.
PHYSICAL REVIEW LETTERS
(2023)
Article
Optics
Lukas Bulla, Kristian Hjorth, Oskar Kohout, Jan Lang, Sebastian Ecker, Sebastian P. Neumann, Julius Bittermann, Robert Kindler, Marcus Huber, Martin Bohmann, Rupert Ursin, Matej Pivoluska
Summary: Our study investigates the presence of high-dimensional entanglement in a recent demonstration of a noise-resistant quantum key distribution (QKD) protocol. We found that the distributed entangled states can be certified to have at least three dimensions. To show this, we developed an energy-time entanglement discretization technique and an improved witness for entanglement dimensionality. Our results provide insight into the complex relationship between high-dimensional entanglement and the noise resistance of QKD protocols operating in high dimensions.
Article
Optics
Ivan Supic, Nicolas Brunner
Summary: This study demonstrates that measurements exhibiting nonlocality without entanglement can be certified in a device-independent manner. The research also shows that genuine network quantum nonlocality can be obtained using only nonentangled measurements.
Article
Optics
Ming Lai Chan, Ziv Aqua, Alexey Tiranov, Barak Dayan, Peter Lodahl, Anders S. Sorensen
Summary: We propose a deterministic and fully passive scheme to transfer the quantum state of a frequency-encoded photon to the spin of a quantum dot via a nanophotonic waveguide. By studying the effects of all relevant experimental imperfections on the state transfer fidelity, we demonstrate that a transfer fidelity exceeding 95% can be achieved for experimentally realistic parameters. Our work paves the way for deterministic solid-state quantum networks tailored to frequency-encoded photonic qubits.
Article
Quantum Science & Technology
Eyuri Wakakuwa, Yoshifumi Nakata, Min-Hsiu Hsieh
Summary: This study investigates state redistribution of a hybrid information source that consists of both classical and quantum components. It explores the transmission of classical and quantum information simultaneously, using shared entanglement and noiseless classical and quantum communication channels. The study presents direct and converse bounds for these three resources based on the smooth conditional entropies of the source state. It also derives various coding theorems for two-party source coding problems, some of which have not been addressed in previous literature.
Article
Optics
Sebastien Designolle
Summary: Quantum systems of high dimensions have interesting properties in observing entanglement or other forms of correlations, making them attractive for experiments in quantum communication or quantum cryptography due to their improved resistance to noise. However, verifying the high-dimensional nature remains challenging, especially when weak assumptions are made on the parties involved, such as considering one of them as a black box. Recently, the concept of genuine high-dimensional steering has been introduced, allowing for a one-sided device-independent certification of the dimension of a bipartite shared state using only two measurements. In this study, the author overcomes the limitations by developing universal bounds on the incompatibility robustness for more than two measurements, which can serve as meaningful dimension certificates.
