Schr\"{o}dinger cats growing up to 60 qubits and dancing in a cat scar enforced discrete time crystal

• URL: http://arxiv.org/abs/2401.08284v1
• Date: Tue, 16 Jan 2024 11:18:09 GMT
• Title: Schr\"{o}dinger cats growing up to 60 qubits and dancing in a cat scar enforced discrete time crystal
• Authors: Zehang Bao, Shibo Xu, Zixuan Song, Ke Wang, Liang Xiang, Zitian Zhu, Jiachen Chen, Feitong Jin, Xuhao Zhu, Yu Gao, Yaozu Wu, Chuanyu Zhang, Ning Wang, Yiren Zou, Ziqi Tan, Aosai Zhang, Zhengyi Cui, Fanhao Shen, Jiarun Zhong, Tingting Li, Jinfeng Deng, Xu Zhang, Hang Dong, Pengfei Zhang, Yang-Ren Liu, Liangtian Zhao, Jie Hao, Hekang Li, Zhen Wang, Chao Song, Qiujiang Guo, Biao Huang, H. Wang
• Abstract summary: Greenberger-Horne-Zeilinger (GHZ) states, as maximally entangled Schr"odinger cat states, play vital roles in the foundations of quantum physics and technology. We propose an efficient protocol suitable for two-dimensional quantum processors. By employing sequences of high-fidelity quantum gates, we achieve genuine GHZ entanglement at the intermediate scale with up to 60 superconducting qubits.
• Score: 20.49846840977366
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Greenberger-Horne-Zeilinger (GHZ) states, as maximally entangled Schr\"{o}dinger cat states, play vital roles in the foundations of quantum physics and technology, but creating and preserving these fragile states pose tremendous challenges. Discrete time crystals (DTCs), originally aimed at exploring exotic nonequilibrium quantum matters, have raised significant scientific interest, but whether this brilliant concept can lead to true applications remains unclear. Here we propose an efficient protocol suitable for two-dimensional quantum processors, and by employing sequences of high-fidelity quantum gates, we achieve genuine GHZ entanglement at the intermediate scale with up to 60 superconducting qubits. More importantly, we take a new perspective on DTC by deterministically engineering pairwise cat eigenstates as quantum many-body scars, which shield the GHZ states from generic perturbations and enable dynamical switching during the state evolution. Our results not only nail down a direct application of DTC, but also establish engineerable many-body systems far from equilibrium as a versatile platform to protect and steer fragile but intriguing quantum entanglement.

Related papers

• Entanglement-efficiency trade-offs in the fusion-based generation of photonic GHZ-like states [0.0]
  We present a linear-optical approach for generating and fusing GHZ-like states, which generalize standard GZ states to include variable entanglement degrees.<n>Results offer a promising pathway toward resource-efficient entangled-state generation for scalable quantum computing and communication.
  arXiv  Detail & Related papers  (2025-07-16T16:36:54Z)
• Observation of Genuine High-dimensional Multi-partite Non-locality in Entangled Photon States [4.377187064674359]
  A significant effort is underway to progressively enhance the entanglement dimension between two particles.<n>We present an experimental study demonstrating multi-partite quantum non-locality beyond qubit constraints.<n>Our results reveal ways in which high-dimensional systems can surpass qubits in terms of violating local-hidden-variable theories.
  arXiv  Detail & Related papers  (2025-05-15T07:33:01Z)
• Thermalization and Criticality on an Analog-Digital Quantum Simulator [133.58336306417294]
  We present a quantum simulator comprising 69 superconducting qubits which supports both universal quantum gates and high-fidelity analog evolution. We observe signatures of the classical Kosterlitz-Thouless phase transition, as well as strong deviations from Kibble-Zurek scaling predictions. We digitally prepare the system in pairwise-entangled dimer states and image the transport of energy and vorticity during thermalization.
  arXiv  Detail & Related papers  (2024-05-27T17:40:39Z)
• Dissipative stabilization of high-dimensional GHZ states for neutral atoms [7.301613921876764]
  High-dimensional quantum entanglement characterizes the entanglement of quantum systems within a larger Hilbert space. The high-dimensional Greenberger-Horne-Zeilinger (GHZ) state, symbolic of this type of entanglement, is of significant importance in various quantum information processing applications. This study proposes integrating a neutral atom platform with quantum reservoir engineering to generate a high-dimensional GZ state deterministically.
  arXiv  Detail & Related papers  (2024-03-01T01:02:12Z)
• QuantumSEA: In-Time Sparse Exploration for Noise Adaptive Quantum Circuits [82.50620782471485]
  QuantumSEA is an in-time sparse exploration for noise-adaptive quantum circuits. It aims to achieve two key objectives: (1) implicit circuits capacity during training and (2) noise robustness. Our method establishes state-of-the-art results with only half the number of quantum gates and 2x time saving of circuit executions.
  arXiv  Detail & Related papers  (2024-01-10T22:33:00Z)
• Realizing the Nishimori transition across the error threshold for constant-depth quantum circuits [0.0]
  We study the generation of the simplest long-range order on a 127 superconducting qubit device. By experimentally tuning coherent and incoherent error rates, we demonstrate stability of this decoded long-range order in two spatial dimensions. Our study exemplifies how measurement-based state preparation can be meaningfully explored on quantum processors beyond a hundred qubits.
  arXiv  Detail & Related papers  (2023-09-06T09:43:12Z)
• Quantum Gate Optimization for Rydberg Architectures in the Weak-Coupling Limit [55.05109484230879]
  We demonstrate machine learning assisted design of a two-qubit gate in a Rydberg tweezer system. We generate optimal pulse sequences that implement a CNOT gate with high fidelity. We show that local control of single qubit operations is sufficient for performing quantum computation on a large array of atoms.
  arXiv  Detail & Related papers  (2023-06-14T18:24:51Z)
• Fast quantum state transfer and entanglement for cavity-coupled many qubits via dark pathways [1.8352113484137624]
  Quantum state transfer (QST) and entangled state generation (ESG) are important building blocks for modern quantum information processing. We propose a general method to realize high-fidelity fast QST and ESG in a cavity-coupled many qubits system via its dark pathways.
  arXiv  Detail & Related papers  (2022-01-18T08:29:35Z)
• Imaginary Time Propagation on a Quantum Chip [50.591267188664666]
  Evolution in imaginary time is a prominent technique for finding the ground state of quantum many-body systems. We propose an algorithm to implement imaginary time propagation on a quantum computer.
  arXiv  Detail & Related papers  (2021-02-24T12:48:00Z)
• Direct Quantum Communications in the Presence of Realistic Noisy Entanglement [69.25543534545538]
  We propose a novel quantum communication scheme relying on realistic noisy pre-shared entanglement. Our performance analysis shows that the proposed scheme offers competitive QBER, yield, and goodput.
  arXiv  Detail & Related papers  (2020-12-22T13:06:12Z)
• Entangled state generation via quantum walks with multiple coins [2.471925498075058]
  Entanglement swapping provides an efficient method to generate entanglement in quantum communication protocols. We propose a novel scheme to generate entangled state including two-qubit entangled state, two-qudit entangled state, three-qubit GHZ state and three-qudit GHZ state between several designate parties via the model of quantum walks with multiple coins.
  arXiv  Detail & Related papers  (2020-11-03T11:39:40Z)
• Quantum tomography of an entangled three-spin state in silicon [0.0]
  We show operation of a fully functional three-qubit array in silicon and generation of a three-qubit Greenberger-Horne-Zeilinger (GHZ) state. Our result shows the potential of silicon-based qubit platform for demonstrations of multiqubit quantum algorithms.
  arXiv  Detail & Related papers  (2020-10-20T14:27:46Z)
• Entanglement transfer, accumulation and retrieval via quantum-walk-based qubit-qudit dynamics [50.591267188664666]
  Generation and control of quantum correlations in high-dimensional systems is a major challenge in the present landscape of quantum technologies. We propose a protocol that is able to attain entangled states of $d$-dimensional systems through a quantum-walk-based it transfer & accumulate mechanism. In particular, we illustrate a possible photonic implementation where the information is encoded in the orbital angular momentum and polarization degrees of freedom of single photons.
  arXiv  Detail & Related papers  (2020-10-14T14:33:34Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.