Enabling Modularity for Spin Qubits via Driven Quantum Dot-Mediated Entanglement

• URL: http://arxiv.org/abs/2604.03373v1
• Date: Fri, 03 Apr 2026 18:07:15 GMT
• Title: Enabling Modularity for Spin Qubits via Driven Quantum Dot-Mediated Entanglement
• Abstract summary: We present an approach for entangling spin qubits via capacitive coupling mediated by an ac electric field-driven multielectron mediator quantum dot.<n>We show that this approach leads to rapid, single-pulse universal entangling gates for resonant exchange qubits.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We present an approach for entangling spin qubits via capacitive coupling mediated by an ac electric field-driven multielectron mediator quantum dot. To illustrate this method, we consider the case of a driven two-electron dot that mediates entanglement between resonant exchange qubits defined in three-electron triple quantum dots, which enable direct capacitive coupling and interaction with microwave fields via intrinsic spin-charge mixing. The method can also be applied to other types of spin qubits that can be coupled capacitively. We show that this approach leads to rapid, single-pulse universal entangling gates for resonant exchange qubits that are activated via the drive on the mediator dot. Unlike conventional tunneling-based two-qubit gates between exchange-only qubits, the capacitive interaction-based gates we describe do not require an extensive sequence of pulses to mitigate leakage. We describe how this drive-activated local entangling approach can be integrated with the driven sideband-based long-range approach for cavity-mediated entangling gates developed in our previous work in order to enable modularity for spin-based quantum information processing.

Related papers

• Noise-protected two-qubit gate using anisotropic exchange interaction [0.0]
  Hole spin qubits hosted in Germanium quantum dots are promising candidates for scalable quantum computing.<n>We propose a novel two-qubit gate protocol for Germanium hole spin qubits operated in the gapless regime.
  arXiv  Detail & Related papers  (2026-03-13T14:48:25Z)
• Electrically tunable quantum interference of atomic spins on surfaces [43.73138793116028]
  We demonstrate electrical control of quantum interference using atomic spins on an insulating film in a scanning tunneling microscope.<n>We modulate the atomically-confined magnetic interaction between the probe tip and surface atoms with a strong electric field, and drive the spin state rapidly through the energy-level anticrossing.<n>Results open new avenues for all-electrical quantum manipulation in spin-based quantum processors.
  arXiv  Detail & Related papers  (2025-06-01T14:28:36Z)
• Cavity-mediated entanglement of parametrically driven spin qubits via sidebands [0.0]
  We consider a pair of quantum dot-based spin qubits that interact via microwave photons in a superconducting cavity, and that are also parametrically driven by separate external electric fields. We show that the sidebands generated via the driving fields enable highly tunable qubit-qubit entanglement using only ac control.
  arXiv  Detail & Related papers  (2023-07-12T10:35:43Z)
• Enhancing the Coherence of Superconducting Quantum Bits with Electric Fields [62.997667081978825]
  We show that qubit coherence can be improved by tuning defects away from the qubit resonance using an applied DC-electric field. We also discuss how local gate electrodes can be implemented in superconducting quantum processors to enable simultaneous in-situ coherence optimization of individual qubits.
  arXiv  Detail & Related papers  (2022-08-02T16:18:30Z)
• Nonadiabatic quantum control of quantum dot arrays with fixed exchange using Cartan decomposition [0.0]
  In semiconductor spin qubits, shuttling of spin is a practical way to generate quantum operations between distant qubits. We extend our previous results for double- and triple-dot systems, and describe a method for implementing spin shuttling in long chains of quantum dots in a nonadiabatic manner.
  arXiv  Detail & Related papers  (2022-07-06T01:04:39Z)
• 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)
• Interaction of quantum systems with single pulses of quantized radiation [68.8204255655161]
  We describe the interaction of a propagating pulse of quantum radiation with a localized quantum system. By transformation to an appropriate picture, we identify the usual Jaynes-Cummings Hamiltonian between the scatterer and a superposition of the initial and final mode. The transformed master equation offers important insights into the system dynamics and it permits numerically efficient solutions.
  arXiv  Detail & Related papers  (2022-03-14T20:23:23Z)
• Probing the coherence of solid-state qubits at avoided crossings [51.805457601192614]
  We study the quantum dynamics of paramagnetic defects interacting with a nuclear spin bath at avoided crossings. The proposed theoretical approach paves the way to designing the coherence properties of spin qubits from first principles.
  arXiv  Detail & Related papers  (2020-10-21T15:37:59Z)
• Waveguide Bandgap Engineering with an Array of Superconducting Qubits [101.18253437732933]
  We experimentally study a metamaterial made of eight superconducting transmon qubits with local frequency control. We observe the formation of super- and subradiant states, as well as the emergence of a polaritonic bandgap. The circuit of this work extends experiments with one and two qubits towards a full-blown quantum metamaterial.
  arXiv  Detail & Related papers  (2020-06-05T09:27:53Z)
• Exchange coupling in a linear chain of three quantum-dot spin qubits in silicon [2.161915301690476]
  Quantum gates between spin qubits can be implemented leveraging the natural Heisenberg exchange interaction between two electrons in contact with each other. Superexchange is the coupling between remote spins mediated by a third idle electron that bridges the distance between quantum dots. We experimentally demonstrate direct exchange coupling and provide evidence for second neighbour mediated superexchange in a linear array of three single-electron spin qubits in silicon.
  arXiv  Detail & Related papers  (2020-04-16T14:01:51Z)
• Programmable two-qubit gates in capacitively coupled flopping-mode spin qubits [0.0]
  We show a versatile set of quantum gates between adjacent spin qubits defined in semiconductor quantum dots. We calculate the estimated infidelity of different two-qubit gates in the most immediate possible experimental realizations.
  arXiv  Detail & Related papers  (2020-03-04T15:37:21Z)

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.