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Patrick L, Arshad U, Guo D, Mirza I. Chirality-assisted enhancement of tripartite entanglement in waveguide QED. Sci Rep 2024; 14:11175. [PMID: 38750056 PMCID: PMC11096189 DOI: 10.1038/s41598-024-61043-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2023] [Accepted: 04/29/2024] [Indexed: 05/18/2024] Open
Abstract
We study the generation and control of genuine tripartite entanglement among quantum emitters (QEs) that are side-coupled to one-dimensional spin-momentum locked (or chiral) waveguides. By applying the machinery of Fock state master equations along with the recently proposed concurrence fill measure of tripartite entanglement [S. Xie and J. H. Eberly, Phys. Rev. Lett. 127, 040403 (2021)], we analyze how three-photon Gaussian wavepackets can distribute entanglement among two and three QEs. We show that with a five times larger waveguide decay rate in the right direction as compared to the left direction, the maximum value of tripartite entanglement can be elevated by 35 % as compared to the symmetric scenario where both left, and right direction decay rates are equal. Additionally, chirality can maintain the tripartite entanglement for longer than the corresponding symmetric decay rate. Finally, we study the influence of detunings and spontaneous emission on the resulting entanglement. We envision quantum networking and long-distance quantum communication as two main areas of applications of this work.
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Affiliation(s)
- Logan Patrick
- Macklin Quantum Information Sciences, Department of Physics, Miami University, Oxford, Ohio, 45056, USA
| | - Umar Arshad
- Macklin Quantum Information Sciences, Department of Physics, Miami University, Oxford, Ohio, 45056, USA
| | - Dingyu Guo
- Macklin Quantum Information Sciences, Department of Physics, Miami University, Oxford, Ohio, 45056, USA
| | - Imran Mirza
- Macklin Quantum Information Sciences, Department of Physics, Miami University, Oxford, Ohio, 45056, USA.
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Luo YX, Cong LJ, Zheng ZG, Liu HY, Ming Y, Yang RC. Entanglement enhancement and EPR steering based on a PT-symmetric-like cavity-opto-magnomechanical hybrid system. OPTICS EXPRESS 2023; 31:34764-34778. [PMID: 37859225 DOI: 10.1364/oe.500854] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2023] [Accepted: 09/19/2023] [Indexed: 10/21/2023]
Abstract
We investigate the enhancement of entanglement and EPR steering in a parity-time(PT-) symmetric-like cavity-opto-magnomechanical system. The system consists of an optical cavity, a magnon mode in a ferromagnetic crystal, a phonon mode, and a microwave cavity. Our findings demonstrate that microwave-cavity gain significantly boosts distant quantum entanglement and greatly improves the robustness of bipartite entanglement against environment temperature. Additionally, we observe an enhancement of tripartite entanglement within the system and uncover the phenomenon of entanglement transfer. Notably, we also achieve one-way steering and two-way asymmetric steering in the system. This study offers insights into the integration of traditional optomechanics and cavity magnomechanics, presenting a novel approach to manipulate asymmetric quantum steering between two distant macroscopic objects. The implications of our research extend to the fields of quantum state preparation and quantum information.
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Cong LJ, Luo YX, Zheng ZG, Liu HY, Ming Y, Yang RC. Entanglement generation and steering implementation in a double-cavity-magnon hybrid system. OPTICS EXPRESS 2023; 31:34021-34033. [PMID: 37859167 DOI: 10.1364/oe.499066] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2023] [Accepted: 09/10/2023] [Indexed: 10/21/2023]
Abstract
We demonstrate a scheme for the generation of bipartite and tripartite entanglement, as well as he implementation of stable and controllable long-distance one-way and asymmetric two-way steering in a cavity-magnon hybrid system. This system consists of a magnon mode and two coupled microwave cavities. The first cavity is driven by a flux-driven Josephson parametric amplifier, which generates squeezed vacuum fields, and is coupled to the other cavity through optical tunneling interaction. The second cavity and magnon mode are coupled through magnetic dipole interaction. We find that under weak coupling between the two cavities, and strong coupling between the second cavity and magnon mode, remote controllable one-way steering and tripartite entanglement can be achieved. Our scheme may have potential applications in quantum information.
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Rizvi SMA, Asif N, Ulum MS, Duong TQ, Shin H. Multiclass Classification of Metrologically Resourceful Tripartite Quantum States with Deep Neural Networks. SENSORS (BASEL, SWITZERLAND) 2022; 22:6767. [PMID: 36146114 PMCID: PMC9500965 DOI: 10.3390/s22186767] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/14/2022] [Revised: 08/24/2022] [Accepted: 09/04/2022] [Indexed: 06/16/2023]
Abstract
Quantum entanglement is a unique phenomenon of quantum mechanics, which has no classical counterpart and gives quantum systems their advantage in computing, communication, sensing, and metrology. In quantum sensing and metrology, utilizing an entangled probe state enhances the achievable precision more than its classical counterpart. Noise in the probe state preparation step can cause the system to output unentangled states, which might not be resourceful. Hence, an effective method for the detection and classification of tripartite entanglement is required at that step. However, current mathematical methods cannot robustly classify multiclass entanglement in tripartite quantum systems, especially in the case of mixed states. In this paper, we explore the utility of artificial neural networks for classifying the entanglement of tripartite quantum states into fully separable, biseparable, and fully entangled states. We employed Bell's inequality for the dataset of tripartite quantum states and train the deep neural network for multiclass classification. This entanglement classification method is computationally efficient due to using a small number of measurements. At the same time, it also maintains generalization by covering a large Hilbert space of tripartite quantum states.
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Affiliation(s)
- Syed Muhammad Abuzar Rizvi
- Department of Electronics and Information Convergence Engineering, Kyung Hee University, Yongin 17104, Korea
| | - Naema Asif
- Department of Electronics and Information Convergence Engineering, Kyung Hee University, Yongin 17104, Korea
| | - Muhammad Shohibul Ulum
- Department of Electronics and Information Convergence Engineering, Kyung Hee University, Yongin 17104, Korea
| | - Trung Q. Duong
- School of Electronics, Electrical Engineering and Computer Science, Queen’s University Belfast, Belfast BT7 1NN, UK
| | - Hyundong Shin
- Department of Electronics and Information Convergence Engineering, Kyung Hee University, Yongin 17104, Korea
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Bello FD, Kongsuwan N, Hess O. Near-Field Generation and Control of Ultrafast, Multipartite Entanglement for Quantum Nanoplasmonic Networks. NANO LETTERS 2022; 22:2801-2808. [PMID: 35360907 PMCID: PMC9011391 DOI: 10.1021/acs.nanolett.1c04920] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Revised: 03/22/2022] [Indexed: 05/17/2023]
Abstract
For a quantum Internet, one needs reliable sources of entangled particles that are compatible with measurement techniques enabling time-dependent, quantum error correction. Ideally, they will be operable at room temperature with a manageable decoherence versus generation time. To accomplish this, we theoretically establish a scalable, plasmonically based archetype that uses quantum dots (QD) as quantum emitters, known for relatively low decoherence rates near room temperature, that are excited using subdiffracted light from a near-field transducer (NFT). NFTs are a developing technology that allow rasterization across arrays of qubits and remarkably generate enough power to strongly drive energy transitions on the nanoscale. This eases the fabrication of QD media, while efficiently controlling picosecond-scale dynamic entanglement of a multiqubit system that approaches maximum fidelity, along with fluctuation between tripartite and bipartite entanglement. Our strategy radically increases the scalability and accessibility of quantum information devices while permitting fault-tolerant quantum computing using time-repetition algorithms.
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Affiliation(s)
- Frank Daniel Bello
- School
of Physics and CRANN Institute, Trinity
College Dublin, Dublin 2, Ireland
| | - Nuttawut Kongsuwan
- Quantum
Technology Foundation (Thailand), 98 Soi Ari, Bangkok 10110, Thailand
- Thailand
Center of Excellence in Physics, Ministry of Higher Education, Science,
Research and Innovation, Bangkok 10400, Thailand
- Blackett
Laboratory, Department of Physics, Imperial
College London, London SW7 2AZ, United Kingdom
| | - Ortwin Hess
- School
of Physics and CRANN Institute, Trinity
College Dublin, Dublin 2, Ireland
- Blackett
Laboratory, Department of Physics, Imperial
College London, London SW7 2AZ, United Kingdom
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Mitra A, Chattopadhyay P, Paul G, Zarikas V. Binary Black Hole Information Loss Paradox and Future Prospects. ENTROPY (BASEL, SWITZERLAND) 2020; 22:E1387. [PMID: 33302364 PMCID: PMC7762553 DOI: 10.3390/e22121387] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/20/2020] [Revised: 11/08/2020] [Accepted: 11/16/2020] [Indexed: 11/17/2022]
Abstract
Various techniques to tackle the black hole information paradox have been proposed. A new way out to tackle the paradox is via the use of a pseudo-density operator. This approach has successfully dealt with the problem with a two-qubit entangle system for a single black hole. In this paper, we present the interaction with a binary black hole system by using an arrangement of the three-qubit system of Greenberger-Horne-Zeilinger (GHZ) state. We show that our results are in excellent agreement with the theoretical value. We have also studied the interaction between the two black holes by considering the correlation between the qubits in the binary black hole system. The results depict a complete agreement with the proposed model. In addition to the verification, we also propose how modern detection of gravitational waves can be used on our optical setup as an input source, thus bridging the gap with the gravitational wave's observational resources in terms of studying black hole properties with respect to quantum information and entanglement.
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Affiliation(s)
- Ayan Mitra
- Department of Mechanical and Aerospace Engineering, Nazarbayev University, Nur-Sultan 010000, Kazakhstan;
| | - Pritam Chattopadhyay
- Cryptology and Security Research Unit, R.C. Bose Center for Cryptology and Security, Indian Statistical Institute, Kolkata 700108, India; (P.C.); (G.P.)
| | - Goutam Paul
- Cryptology and Security Research Unit, R.C. Bose Center for Cryptology and Security, Indian Statistical Institute, Kolkata 700108, India; (P.C.); (G.P.)
| | - Vasilios Zarikas
- Department of Mechanical and Aerospace Engineering, Nazarbayev University, Nur-Sultan 010000, Kazakhstan;
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Control of the Geometric Phase in Two Open Qubit-Cavity Systems Linked by a Waveguide. ENTROPY 2020; 22:e22010085. [PMID: 33285860 PMCID: PMC7516521 DOI: 10.3390/e22010085] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/28/2019] [Revised: 12/28/2019] [Accepted: 01/08/2020] [Indexed: 11/17/2022]
Abstract
We explore the geometric phase in a system of two non-interacting qubits embedded in two separated open cavities linked via an optical fiber and leaking photons to the external environment. The dynamical behavior of the generated geometric phase is investigated under the physical parameter effects of the coupling constants of both the qubit–cavity and the fiber–cavity interactions, the resonance/off-resonance qubit–field interactions, and the cavity dissipations. It is found that these the physical parameters lead to generating, disappearing and controlling the number and the shape (instantaneous/rectangular) of the geometric phase oscillations.
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