Long-Range Entangling Operations via Josephson Junction Metasurfaces

• URL: http://arxiv.org/abs/2506.14958v1
• Date: Tue, 17 Jun 2025 20:19:03 GMT
• Title: Long-Range Entangling Operations via Josephson Junction Metasurfaces
• Authors: Mustafa Bakr,
• Abstract summary: We implement two-qubit entangling operations between distant superconducting qubits using a space-time modulated Josephson junction metasurface.<n>We show entangling fidelity exceeding 98% maintained over centimeter scale separations.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We present a framework for implementing two-qubit entangling operations between distant superconducting qubits using a space-time modulated Josephson junction metasurface. By modulating the surface in both space and time, we engineer sidebands with controllable wavevectors that selectively couple target qubits. The metasurface acts as a reconfigurable coupling medium, where the interaction strength is determined by engineered transmission coefficients rather than by exponentially decaying near-field coupling, thus reducing the dependence on physical proximity. We investigated the implementation of two-qubit interactions via iSWAP gates driven resonantly through the metasurface and controlled phase gates via geometric phase accumulation. Simulations show entangling fidelity exceeding 98% maintained over centimeter scale separations.

Related papers

• High-fidelity all-microwave CZ gate with partial erasure-error detection via a transmon coupler [1.5649495995972291]
  We experimentally demonstrate an all-microwave controlled-frequency (CZZ) gate that achieves high fidelity while suppressing residual ZZ interactions.<n>We can maintain a small interaction between two data transmons while coupling between the data and coupler transmons to accelerate the CZ-gate speed.
  arXiv  Detail & Related papers  (2025-11-03T06:11:18Z)
• Directional Motional Control via Engineered Conical Intersections in Trapped Rydberg Ions [0.0]
  We demonstrate coherent control of motional dynamics in trapped Rydberg ions engineered to exhibit a conical intersection between adiabatic potential-energy surfaces.<n>This work demonstrates that engineered conical intersections can serve as a new control resource for directional motional dynamics.
  arXiv  Detail & Related papers  (2025-09-14T16:53:25Z)
• Parametrically Driven Superradiance of an Interacting Tavis-Cummings Model [3.8385593714565047]
  We consider the superradiant transition of a generalized Tavis-Cummings model, where a number of two-level qubits are coupled to a dissipative cavity.<n>While the nonlinear gain from the parametric drive breaks the U(1) symmetry of the standard Tavis-Cummings model, we show that the interactions impact the collective excitations and significantly modify the superradiant transition.
  arXiv  Detail & Related papers  (2025-08-31T04:24:30Z)
• A 2x2 quantum dot array in silicon with fully tuneable pairwise interdot coupling [29.539407433267254]
  We present a 2D array of silicon metal-oxide-semiconductor (MOS) quantum dots with tunable interdot coupling between all adjacent dots.<n>The device is characterized at 4.2 K, where we demonstrate the formation and isolation of double-dot and triple-dot configurations.
  arXiv  Detail & Related papers  (2024-11-21T06:46:15Z)
• Floquet Engineering of Anisotropic Transverse Interactions in Superconducting Qubits [16.41991651645662]
  We show the simultaneous realization of pairing (XX-YY) and hopping (XX+YY) interactions between transmon qubits by Floquet engineering. The coherent superposition of these interactions enables independent control over the XX and YY terms, yielding anisotropic transverse interactions.
  arXiv  Detail & Related papers  (2024-10-14T07:04:06Z)
• Remote Entangling Gates for Spin Qubits in Quantum Dots using a Charge-Sensitive Superconducting Coupler [0.2796197251957245]
  We propose a method to realize microwave-activated CZ gates between two remote spin qubits in quantum dots using a charge-sensitive superconducting coupler.<n>We develop non-Markovian time-domain simulations to accurately model gate performance in the presence of $1/fbeta$ charge noise.
  arXiv  Detail & Related papers  (2024-09-13T15:31:10Z)
• Controlling measurement-induced phase transitions with tunable detector coupling [44.99833362998488]
  We study the evolution of a quantum many-body system driven by two competing measurements.<n>We employ a positive operator-valued measurement with variable coupling between the system and detector.
  arXiv  Detail & Related papers  (2024-04-11T17:02:58Z)
• Probing pair correlations in Fermi gases with Ramsey-Bragg interferometry [41.94295877935867]
  We propose an interferometric method to probe pair correlations in a gas of spin-1/2 fermions. The method consists of a Ramsey sequence where both spin states of the Fermi gas are set in a superposition of a state at rest and a state with a large recoil velocity. The off-diagonal long-range order is directly reflected in the behavior of the interferometric signal for long interrogation times.
  arXiv  Detail & Related papers  (2023-12-21T15:46:29Z)
• Coupler microwave-activated controlled phase gate on fluxonium qubits [32.73124984242397]
  A tunable coupler typically includes a nonlinear element, such as a SQUID, which is used to tune the resonance frequency of an LC circuit connecting two qubits. Here we propose a complimentary approach where instead of tuning the resonance frequency of the tunable coupler by applying a quasistatic control signal, we excite by microwave the degree of freedom associated with the coupler itself.
  arXiv  Detail & Related papers  (2023-02-20T07:51:04Z)
• Phase diagram of Rydberg-dressed atoms on two-leg triangular ladders [50.591267188664666]
  We investigate the phase diagram of hard-core bosons in a triangular ladder with next-to-nearest-neighbor interaction along each leg. For weak interactions, Abelian bosonization predicts a spin density wave and a fully gapless Luttinger liquid phase. The competition with the zigzag interaction generates a charge density wave, a 'polarized holonic' phase, and a crystalline phase at the filling 2/5.
  arXiv  Detail & Related papers  (2022-07-01T12:49:04Z)
• Tuning long-range fermion-mediated interactions in cold-atom quantum simulators [68.8204255655161]
  Engineering long-range interactions in cold-atom quantum simulators can lead to exotic quantum many-body behavior. Here, we propose several tuning knobs, accessible in current experimental platforms, that allow to further control the range and shape of the mediated interactions.
  arXiv  Detail & Related papers  (2022-03-31T13:32:12Z)
• Qubit-photon bound states in topological waveguides with long-range hoppings [62.997667081978825]
  Quantum emitters interacting with photonic band-gap materials lead to the appearance of qubit-photon bound states. We study the features of the qubit-photon bound states when the emitters couple to the bulk modes in the different phases. We consider the coupling of emitters to the edge modes appearing in the different topological phases.
  arXiv  Detail & Related papers  (2021-05-26T10:57:21Z)
• Hardware-Efficient Microwave-Activated Tunable Coupling Between Superconducting Qubits [0.0]
  We realize a tunable $ZZ$ interaction between two transmon qubits with fixed frequencies and fixed coupling. Because both transmons are driven, it is resilient to microwave crosstalk. We apply this interaction to implement a controlled phase (CZ) gate with a gate fidelity of $99.43(1)%$ as measured by cycle benchmarking.
  arXiv  Detail & Related papers  (2021-05-12T01:06:08Z)
• Continuous and time-discrete non-Markovian system-reservoir interactions: Dissipative coherent quantum feedback in Liouville space [62.997667081978825]
  We investigate a quantum system simultaneously exposed to two structured reservoirs. We employ a numerically exact quasi-2D tensor network combining both diagonal and off-diagonal system-reservoir interactions with a twofold memory for continuous and discrete retardation effects. As a possible example, we study the non-Markovian interplay between discrete photonic feedback and structured acoustic phononovian modes, resulting in emerging inter-reservoir correlations and long-living population trapping within an initially-excited two-level system.
  arXiv  Detail & Related papers  (2020-11-10T12:38:35Z)
• Collective radiation from distant emitters [63.391402501241195]
  We show that the spectrum of the radiated field exhibits non-Markovian features such as linewidth broadening beyond standard superradiance. We discuss a proof-of-concept implementation of our results in a superconducting circuit platform.
  arXiv  Detail & Related papers  (2020-06-22T19:03:52Z)

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.