Optimal Control for Rydberg multi-qubit operations

• URL: http://arxiv.org/abs/2511.22202v1
• Date: Thu, 27 Nov 2025 08:18:37 GMT
• Title: Optimal Control for Rydberg multi-qubit operations
• Authors: Hossein Abedi, Mohammadsadegh Khazali, Klaus Mølmer,
• Abstract summary: We leverage quantum optimal control techniques to design single continuous laser pulses that implement multi-qubit controlled-phase, -NOT and -swap gates on Rydberg atom quantum processors.<n>We find that the controlled-swap (Fredkin) gate achieves 99.74% fidelity while accounting for imperfections such as spontaneous emission, laser fluctuations, and Doppler dephasing.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Quantum computing algorithms can be decomposed into a universal set of elementary one- and two-qubit gates. Different physical implementations of quantum computing, however, employ interactions that permit direct conditional dynamics on multiple qubits in a single step. In this work, we leverage quantum optimal control techniques to design single continuous laser pulses that implement multi-qubit controlled-phase, -NOT and -swap (Fredkin) gates on Rydberg atom quantum processors. The identification of robust multi-qubit operations leads to reduced operation time and less decoherence, and the control field provides continuous protection of the atoms from environmental noise. Notably, we find that the controlled-swap (Fredkin) gate, implemented using this approach achieves 99.74\% fidelity while accounting for imperfections such as spontaneous emission, laser fluctuations, and Doppler dephasing.

Related papers

• Robust iSWAP gates for semiconductor spin qubits with local driving [0.0]
  We propose a robust iSWAP gate protocol for semiconductor spin qubits.<n>Our scheme uses only local microwave drives on conventional exchange-coupled spin qubits.
  arXiv  Detail & Related papers  (2025-10-06T03:25:00Z)
• Multi-Qubit Parity Gates for Rydberg Atoms in Various Configurations [0.3749861135832073]
  We present a native approach for realizing multi-qubit parity phase gates in neutral atom systems.<n>By shaping the temporal profile of the laser's phase, we enable high fidelity, time efficient entangling operations between multiple qubits without requiring individual qubit addressing.<n>Results facilitate the practical implementation of complex, multi-qubit quantum operations in near-term neutral atom quantum processors.
  arXiv  Detail & Related papers  (2025-06-11T13:02:51Z)
• Traversing Quantum Control Robustness Landscapes: A New Paradigm for Quantum Gate Engineering [0.0]
  We introduce the Quantum Control Robustness Landscape (QCRL), a conceptual framework that maps control parameters to noise susceptibility.<n>By navigating through the level sets of the QCRL, our Robustness-Invariant Pulse Variation (RIPV) algorithm allows for the variation of control pulses while preserving robustness.<n> Numerical simulations demonstrate that our single- and two-qubit gates exceed the quantum error correction threshold even with substantial noise.
  arXiv  Detail & Related papers  (2024-12-27T05:56:38Z)
• Optimal control in large open quantum systems: the case of transmon readout and reset [44.99833362998488]
  We present a framework that combines the adjoint-state method together with reverse-time backpropagation to solve prohibitively large open-system quantum control problems.<n>We apply this framework to optimize two inherently dissipative operations in superconducting qubits.<n>Our results show that while standard pulses for dispersive readout are nearly optimal, adding a transmon drive during the protocol can yield 2x improvements in fidelity and duration.
  arXiv  Detail & Related papers  (2024-03-21T18:12:51Z)
• Near-Term Distributed Quantum Computation using Mean-Field Corrections and Auxiliary Qubits [77.04894470683776]
  We propose near-term distributed quantum computing that involve limited information transfer and conservative entanglement production. We build upon these concepts to produce an approximate circuit-cutting technique for the fragmented pre-training of variational quantum algorithms.
  arXiv  Detail & Related papers  (2023-09-11T18:00:00Z)
• 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)
• Multi-squeezed state generation and universal bosonic control via a driven quantum Rabi model [68.8204255655161]
  Universal control over a bosonic degree of freedom is key in the quest for quantum-based technologies. Here we consider a single ancillary two-level system, interacting with the bosonic mode of interest via a driven quantum Rabi model. We show that it is sufficient to induce the deterministic realization of a large class of Gaussian and non-Gaussian gates, which in turn provide universal bosonic control.
  arXiv  Detail & Related papers  (2022-09-16T14:18:53Z)
• Optimal quantum control via genetic algorithms for quantum state engineering in driven-resonator mediated networks [68.8204255655161]
  We employ a machine learning-enabled approach to quantum state engineering based on evolutionary algorithms. We consider a network of qubits -- encoded in the states of artificial atoms with no direct coupling -- interacting via a common single-mode driven microwave resonator. We observe high quantum fidelities and resilience to noise, despite the algorithm being trained in the ideal noise-free setting.
  arXiv  Detail & Related papers  (2022-06-29T14:34:00Z)
• Implementing two-qubit gates at the quantum speed limit [33.51056531486263]
  We experimentally demonstrate commonly used two-qubit gates at nearly the fastest possible speed. We achieve this quantum speed limit by implementing experimental gates designed using a machine learning inspired optimal control method. We expect our method to offer significant speedups for non-native two-qubit gates.
  arXiv  Detail & Related papers  (2022-06-15T18:00:00Z)
• Optimal model for fewer-qubit CNOT gates with Rydberg atoms [8.01045083320546]
  We report an optimal model about universal two- and three-qubit CNOT gates mediated by excitation to Rydberg states. Compared to conventional multi-pulse piecewise schemes, our gate can be realized by simultaneous excitation of atoms to the Rydberg states.
  arXiv  Detail & Related papers  (2021-12-16T09:54:52Z)
• Scalable and robust quantum computing on qubit arrays with fixed coupling [0.0]
  We propose a scheme for scalable and robust quantum computing on two-dimensional arrays of qubits with fixed longitudinal coupling. This opens the possibility for bypassing the device complexity associated with tunable couplers required in conventional quantum computing hardware.
  arXiv  Detail & Related papers  (2021-10-14T21:45:49Z)
• Quantum control landscape for ultrafast generation of single-qubit phase shift quantum gates [68.8204255655161]
  We consider the problem of ultrafast controlled generation of single-qubit phase shift quantum gates. Globally optimal control is a control which realizes the gate with maximal possible fidelity. Trap is a control which is optimal only locally but not globally.
  arXiv  Detail & Related papers  (2021-04-26T16:38:43Z)
• Improving the Performance of Deep Quantum Optimization Algorithms with Continuous Gate Sets [47.00474212574662]
  Variational quantum algorithms are believed to be promising for solving computationally hard problems. In this paper, we experimentally investigate the circuit-depth-dependent performance of QAOA applied to exact-cover problem instances. Our results demonstrate that the use of continuous gate sets may be a key component in extending the impact of near-term quantum computers.
  arXiv  Detail & Related papers  (2020-05-11T17:20:51Z)

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.