Article
Quantum Science & Technology
Mikkel Larsen, Christopher Chamberland, Kyungjoo Noh, Jonas S. Neergaard-Nielsen, Ulrik L. Andersen
Summary: A simple architecture for preparing cluster states in three dimensions and efficiently implementing gates through gate teleportation is proposed. The architecture supports topological qubit error correction and efficiently implements GKP error correction internally through teleportation.
Article
Quantum Science & Technology
Robert I. Booth, Damian Markham
Summary: In measurement-based quantum computing, the concept of CV-flow is introduced for continuous-variable graph states. It approximates a unitary transformation well and addresses convergence issues in the infinite-dimensional setting. Additionally, a method for converting CV-MBQC computation into circuit form is provided.
Article
Physics, Multidisciplinary
Martin Gaerttner, Tobias Haas, Johannes Noll
Summary: We present a general class of entanglement criteria for continuous variable systems based on the Husimi Q distribution, which allows for optimization over a set of concave functions. Our criteria have clear advantages under typical experimental constraints and can detect entanglement states that are undetectable by commonly used criteria.
PHYSICAL REVIEW LETTERS
(2023)
Article
Optics
Roohollah Ghobadi
Summary: This study investigates the role of nonclassical kernels in data distribution and parameter estimation, as well as the impact of imperfect state preparation, highlighting the importance of phase-space correlation functions in understanding the distinction between classical machine learning and quantum machine learning.
Article
Quantum Science & Technology
Wei Zhao, Ronghua Shi, Jinjing Shi, Xinchao Ruan, Ying Guo, Duan Huang
Summary: The study introduces a continuous-variable quantum digital signature protocol that eliminates side-channel attacks by leveraging topology and measurement-device-independent components, as well as utilizing phase-encoding and state-encoding strategies to achieve dual signatures. The protocol involves three participants who can independently decide what type of pulses to send to the intermediate station at any time window.
QUANTUM INFORMATION PROCESSING
(2021)
Article
Physics, Multidisciplinary
Paolo Abiuso, Stefan Bauml, Daniel Cavalcanti, Antonio Acin
Summary: We studied the detection of continuous-variable entanglement and presented protocols for entanglement detection in a scenario where the measurement devices are completely uncharacterized. The protocols allow for the measurement-device-independent certification of entanglement of all two-mode entangled Gaussian states and are feasible with current technology using standard optical setups such as coherent states and homodyne measurements.
PHYSICAL REVIEW LETTERS
(2021)
Article
Computer Science, Artificial Intelligence
Ryan Sweke, Markus S. Kesselring, Evert P. L. van Nieuwenburg, Jens Eisert
Summary: Topological error correcting codes, particularly the surface code, are currently the most feasible roadmap for large-scale fault-tolerant quantum computation. This research shows that decoding such codes can be reformulated as interactions between a decoding agent and a code environment, using reinforcement learning to obtain decoding agents. By using deep Q learning, decoding agents for various simplified phenomenological noise models were obtained.
MACHINE LEARNING-SCIENCE AND TECHNOLOGY
(2021)
Article
Computer Science, Information Systems
Muhammad Kashif, Saif Al-Kuwari
Summary: Quantum computers, based on the principles of quantum mechanics, have the potential to outperform classical computers in various applications, with implications across different domains. Measurement-based Quantum Computation (MBQC) is an alternative computational approach, in which large ensembles of qubits are prepared in highly entangled cluster states and quantum computations are performed through sequential measurements. This paper thoroughly discusses and compares different methods for realizing cluster states using both continuous and discrete variables approaches, including recent advancements in photonic and superconducting qubits entanglement. The most promising approach for achieving efficient cluster state realization in MBQC is highlighted.
Article
Quantum Science & Technology
Min-Quan He, Dan-Bo Zhang, Z. D. Wang
Summary: The research focuses on using inverse iteration quantum eigensolvers to reduce the coherent evolution time of Hamiltonians in quantum algorithms, by constructing a linear combination of an inverse Hamiltonian. Continuous-variable resources are valuable for this purpose and the algorithm is demonstrated with numerical simulations for various physical systems.
QUANTUM SCIENCE AND TECHNOLOGY
(2022)
Review
Physics, Multidisciplinary
Shuhong Hao, Xiaowei Deng, Yang Liu, Xiaolong Su, Changde Xie, Kunchi Peng
Summary: Measurement-based quantum computation with continuous variables, based on performing measurement and feedforward of measurement results on a large scale Gaussian cluster state, provides a feasible way to implement quantum computation. Quantum error correction is crucial for protecting quantum information in quantum computation and communication. This review introduces the progress in continuous variable measurement-based quantum computation and quantum error correction using Gaussian cluster states, as well as discusses challenges in fault-tolerant measurement-based quantum computation with continuous variables.
Article
Physics, Multidisciplinary
Naihua Ji, Zhao Chen, Yingjie Qu, Rongyi Bao, Xin Yang, Shumei Wang
Summary: The article discusses the challenge of finding an efficient decoder for quantum error correction codes for fault-tolerant experiments in quantum computing. The study aims to develop a better decoding scheme based on the flag-bridge fault tolerance experiment. The research compares two decoding algorithms, a deep neural network decoding scheme and a recurrent neural network decoding scheme based on the belief propagation algorithm variant MBP4 algorithm. Experimental results showed that the decoding scheme developed in the study improved the pseudo-threshold by 39.52% compared to the minimum-weight perfect matching decoder. The findings suggest that the proposed decoding schemes could improve quantum error correction and fault-tolerant experiments in quantum computing.
FRONTIERS IN PHYSICS
(2023)
Article
Quantum Science & Technology
Xiaoqian Zhang
Summary: The paper introduces a universal BQC protocol based on trap technology and minimal resources, utilizing specific entangled states to achieve universal quantum computation for clients while maintaining privacy protection.
QUANTUM INFORMATION PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Wei Zhao, Fu-qiang Wang, Yi-yu Mao, Hai Zhong, Chao Ding, Xin-chao Ruan
Summary: In this paper, a continuous-variable quantum digital signature protocol based on quantum teleportation is proposed and analyzed. Squeezed states are used to carry key and secret information of the teleported states transmitted through classical and entangled channels. The mean and modulation variance of the teleported quantum state are used to distinguish and order multibit information signatures. The fidelity and security analysis demonstrate the effectiveness and security of the proposed protocol.
RESULTS IN PHYSICS
(2023)
Article
Optics
Olena Kovalenko, Vladyslav C. Usenko, Radim Filip
Summary: Two-mode squeezed states are scalable and robust entanglement resources for quantum information protocols;
Optimizing initial squeezing, relative phase, and linear coupling can reduce the degradation of Gaussian entanglement in the presence of crosstalk;
Compensating crosstalk through mode interference improves the efficiency of using multimode continuous-variable photonic entanglement in quantum networks.
Article
Multidisciplinary Sciences
Alasdair Fletcher, Stefano Pirandola
Summary: A continuous variable, measurement device independent quantum key distribution protocol is analyzed, allowing three parties to connect for quantum conferencing. By utilizing a generalized Bell detection and a postselection procedure, the protocol achieves improved rate-distance performance under a collective pure-loss attack.
SCIENTIFIC REPORTS
(2022)
Article
Physics, Multidisciplinary
Giacomo Pantaleoni, Ben Q. Baragiola, Nicolas C. Menicucci
PHYSICAL REVIEW LETTERS
(2020)
Article
Quantum Science & Technology
J. Eli Bourassa, Rafael N. Alexander, Michael Vasmer, Ashlesha Patil, Ilan Tzitrin, Takaya Matsuura, Daiqin Su, Ben Q. Baragiola, Saikat Guha, Guillaume Dauphinais, Krishna K. Sabapathy, Nicolas C. Menicucci, Ish Dhand
Summary: The proposal introduces a scalable fault-tolerant photonic quantum computer design that utilizes the generation and manipulation of three-dimensional resource states comprising bosonic qubits and squeezed vacuum states. It incorporates state-of-the-art procedures for generating bosonic qubits and squeezed states, along with utilizing a two-dimensional integrated photonic chip to produce qubit cluster states in temporal and spatial dimensions.
Article
Physics, Applied
Warit Asavanant, Baramee Charoensombutamon, Shota Yokoyama, Takeru Ebihara, Tomohiro Nakamura, Rafael N. Alexander, Mamoru Endo, Jun-ichi Yoshikawa, Nicolas C. Menicucci, Hidehiro Yonezawa, Akira Furusawa
Summary: Recent progress in continuous-variable optical quantum computation has seen the realization of scalable measurement bases using cluster states through time-domain multiplexing. Demonstrations of quantum operations using time-domain-multiplexed cluster states have been successful, with a proposed method to evaluate and verify continuous-variable operations. These advancements bring the realization of large-scale fault-tolerant universal optical quantum computers closer to reality.
PHYSICAL REVIEW APPLIED
(2021)
Article
Quantum Science & Technology
Miller Eaton, Carlos Gonzalez-Arciniegas, Rafael N. Alexander, Nicolas C. Menicucci, Olivier Pfister
Summary: The article presents an algorithm for reliably generating various quantum states critical to quantum error correction and universal continuous-variable (CV) quantum computing from Gaussian CV cluster states. The algorithm utilizes the Photon-counting-Assisted NodeTeleportation Method (PhANTM), which employs standard Gaussian information processing with the addition of local photon-number-resolving measurements. The method can stabilize cat states against Gaussian noise and maintain non-Gaussianity within the cluster. Existing protocols for breeding cat states can be embedded into cluster-state processing using PhANTM.
Article
Optics
Blayney W. Walshe, Rafael N. Alexander, Nicolas C. Menicucci, Ben Q. Baragiola
Summary: Continuous-variable cluster states combined with GKP encoding enable fault-tolerant measurement-based quantum computing. For quad-raillattice macronode cluster states, a Clifford gate and GKP error correction can be simultaneously implemented in a single teleportation step. Logical error rates compatible with the thresholds of topological codes can be achieved with finite squeezing in the resources.
Article
Quantum Science & Technology
Ilan Tzitrin, Takaya Matsuura, Rafael N. Alexander, Guillaume Dauphinais, J. Eli Bourassa, Krishna K. Sabapathy, Nicolas C. Menicucci, Ish Dhand
Summary: This work proposes a topologically error-corrected architecture for photonic quantum computing based on Gottesman-Kitaev-Preskill (GKP) qubits, which reduces the state preparation overheads and accelerates the construction of a photonic quantum computer. The proposed circuit's symmetry allows for a more comprehensive threshold estimates by combining the effects of finite squeezing and uniform photon loss within the noise model.
Article
Astronomy & Astrophysics
Scott L. Todd, Giacomo Pantaleoni, Valentina Baccetti, Nicolas C. Menicucci
Summary: The study investigates a simple toy model of particle scattering in the flat spacetime limit of an analogue-gravity model. By performing a sonic analogue to Compton scattering, in-universe observers can determine if they are in motion with respect to their medium and find their velocity with respect to the medium. Through the interaction between the phonon field and the external particle, the Lorentz symmetry of the speed of sound in the medium is explored.
Article
Optics
Lucas J. Mensen, Ben Q. Baragiola, Nicolas C. Menicucci
Summary: The paper introduces a toolkit for phase-space description and manipulation of GKP encodings, allowing for description and manipulation of various types of GKP states and operators. Utilizing phase space simplifies Gaussian unitaries operations, including error correction and magic-state preparation for GKP encodings.
Article
Optics
Giacomo Pantaleoni, Ben Q. Baragiola, Nicolas C. Menicucci
Summary: The study reveals that continuous-variable cluster states and GKP states contain hidden qubit cluster states, making them very useful in measurement-based quantum computing. By decomposing modes into logical and gauge-mode subsystems and using a simple graphical description, the interaction between these cluster states can be better understood.
Article
Optics
Giacomo Pantaleoni, Ben Q. Baragiola, Nicolas C. Menicucci
Summary: The researchers utilize subsystem decomposition to analyze the encoded logical information in CV cluster-state quantum computing with GKP states. They decompose squeezed-vacuum states and approximate GKP states to reveal their logical information, and quantify damage to the logical information in approximate GKP states teleported through noisy CV cluster states. This approach allows them to focus on the encoded qubit information despite the complexities of the full CV nature of the mode.
Article
Optics
Jacob Hastrup, Mikkel Larsen, Jonas S. Neergaard-Nielsen, Nicolas C. Menicucci, Ulrik L. Andersen
Summary: The method of using a single application of the cubic phase gate performs poorly in GKP states and is not suitable for achieving universal fault-tolerant quantum computation.
Article
Astronomy & Astrophysics
Nadine Stritzelberger, Laura J. Henderson, Valentina Baccetti, Nicolas C. Menicucci, Achim Kempf
Summary: The study explores the entanglement harvesting process of delocalized matter systems with quantum field interaction, finding that the extent of delocalization of the center of mass suppresses entanglement harvesting, and that entanglement harvesting is significantly inhibited in media with wave propagation speeds much smaller than the vacuum speed of light.
Proceedings Paper
Engineering, Electrical & Electronic
Baramee Charoensombutamon, Warit Asavanant, Tomohiro Nakamura, Takeru Ebihara, Shota Yokoyama, Rafael N. Alexander, Nicolas C. Menicucci, Mamoru Endo, Jun-ichi Yoshikawa, Hidehiro Yonezawa, Akira Furusawa
2020 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2020)
Article
Optics
Blayney W. Walshe, Ben Q. Baragiola, Rafael N. Alexander, Nicolas C. Menicucci
Article
Astronomy & Astrophysics
Laura J. Henderson, Nicolas C. Menicucci
