Symmetry-protected states of interacting qubits in superconducting quantum circuits

• URL: http://arxiv.org/abs/2510.14121v1
• Date: Wed, 15 Oct 2025 21:44:20 GMT
• Title: Symmetry-protected states of interacting qubits in superconducting quantum circuits
• Authors: Yi Shi, Eran Ginossar, Michael Stern, Marzena Szymanska,
• Abstract summary: We show that a superconducting circuit can reach coherence times exceeding several milliseconds in the presence of realistic environmental noise.<n>Our work opens a pathway to realizing qubits with long coherence times in a new generation of quantum devices.
• Score: 2.99300935573569
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Superconducting circuits are one of the leading candidates for storing and manipulating quantum information. Among them, qubits embedded with intrinsic noise protection have seen rapid advancements in recent years. This noise protection is typically realized by isolating the computational states from local sources of noise. Here, we propose an interacting spin model that requires at least four spins with nearest-neighbor and next-nearest-neighbor couplings, where the two lowest eigenstates form a symmetry-protected qubit manifold, which is robust to both relaxation and dephasing from local perturbations. We map the spin model to a superconducting circuit and show that such a circuit can reach coherence times exceeding several milliseconds in the presence of realistic environmental noise. Our work opens a pathway to realizing qubits with long coherence times in a new generation of quantum devices.

Related papers

• Fast readout of quantum dot spin qubits via Andreev spins [0.0]
  Andreev spin qubits benefit from fast measurement schemes enabled by the large resonator couplings of superconducting qubits but suffer from reduced coherence during qubit operations.<n>Here, we propose fast and high-fidelity measurement protocols based on an electrically-tunable coupling between quantum dot and Andreev spin qubits.
  arXiv  Detail & Related papers  (2025-06-24T16:22:35Z)
• Dissipating quartets of excitations in a superconducting circuit [0.0]
  In this work, we leverage a genuine six-wave mixing process enabled by a near Kerr-free Josephson element to enforce dissipation of quartets of excitations in a superconducting resonator.<n>We show an order of magnitude enhancement of the state decay rate while only marginally impacting the relaxation and coherence of lower energy states.<n>These results pave the way toward the dynamical stabilization of four-component Schr"odinger cat qubits and even more complex bosonic qubits.
  arXiv  Detail & Related papers  (2025-01-10T13:40:51Z)
• Quantum circuits with multiterminal Josephson-Andreev junctions [0.0]
  We explore superconducting quantum circuits where several leads are simultaneously connected beyond the tunneling regime. We find situations of practical interest where the circuits can be used to define noise protected qubits.
  arXiv  Detail & Related papers  (2023-12-28T18:49:11Z)
• Autonomous coherence protection of a two-level system in a fluctuating environment [68.8204255655161]
  We re-examine a scheme originally intended to remove the effects of static Doppler broadening from an ensemble of non-interacting two-level systems (qubits) We demonstrate that this scheme is far more powerful and can also protect a single (or even an ensemble) qubit's energy levels from noise which depends on both time and space.
  arXiv  Detail & Related papers  (2023-02-08T01:44:30Z)
• Quantum emulation of the transient dynamics in the multistate Landau-Zener model [50.591267188664666]
  We study the transient dynamics in the multistate Landau-Zener model as a function of the Landau-Zener velocity. Our experiments pave the way for more complex simulations with qubits coupled to an engineered bosonic mode spectrum.
  arXiv  Detail & Related papers  (2022-11-26T15:04:11Z)
• Topological Josephson parametric amplifier array: A proposal for directional, broadband, and low-noise amplification [39.58317527488534]
  Low-noise microwave amplifiers are crucial for detecting weak signals in fields such as quantum technology and radio astronomy. We show that compact devices with few sites can achieve exceptional performance, with gains exceeding 20 dB over a bandwidth ranging from hundreds of MHz to GHz. The device also operates near the quantum noise limit and provides topological protection against up to 15% fabrication disorder.
  arXiv  Detail & Related papers  (2022-07-27T18:07:20Z)
• Hole spin qubits in thin curved quantum wells [0.0]
  Hole spin qubits are frontrunner platforms for scalable quantum computers. Fastest spin qubits to date are defined in long quantum dots with confinement directions. In these systems the lifetime of the qubit is strongly limited by charge noise. We propose a different, scalable qubit design, compatible with planar CMOS technology.
  arXiv  Detail & Related papers  (2022-04-18T08:34:38Z)
• Learning Noise via Dynamical Decoupling of Entangled Qubits [49.38020717064383]
  Noise in entangled quantum systems is difficult to characterize due to many-body effects involving multiple degrees of freedom. We develop and apply multi-qubit dynamical decoupling sequences that characterize noise that occurs during two-qubit gates.
  arXiv  Detail & Related papers  (2022-01-26T20:22:38Z)
• Moving beyond the transmon: Noise-protected superconducting quantum circuits [55.49561173538925]
  superconducting circuits offer opportunities to store and process quantum information with high fidelity. Noise-protected devices constitute a new class of qubits in which the computational states are largely decoupled from local noise channels. This Perspective reviews the theoretical principles at the heart of these new qubits, describes recent experiments, and highlights the potential of robust encoding of quantum information in superconducting qubits.
  arXiv  Detail & Related papers  (2021-06-18T18:00:13Z)
• Fast high-fidelity single-qubit gates for flip-flop qubits in silicon [68.8204255655161]
  flip-flop qubit is encoded in the states with antiparallel donor-bound electron and donor nuclear spins in silicon. We study the multilevel system that is formed by the interacting electron and nuclear spins. We propose an optimal control scheme that produces fast and robust single-qubit gates in the presence of low-frequency noise.
  arXiv  Detail & Related papers  (2021-01-27T18:37:30Z)
• Hardware-Encoding Grid States in a Non-Reciprocal Superconducting Circuit [62.997667081978825]
  We present a circuit design composed of a non-reciprocal device and Josephson junctions whose ground space is doubly degenerate and the ground states are approximate codewords of the Gottesman-Kitaev-Preskill (GKP) code. We find that the circuit is naturally protected against the common noise channels in superconducting circuits, such as charge and flux noise, implying that it can be used for passive quantum error correction.
  arXiv  Detail & Related papers  (2020-02-18T16:45:09Z)

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.