2024-08-14 ロードアイランド大学(URI)
＜関連情報＞
- https://www.uri.edu/news/2024/08/uri-led-study-holds-promise-for-advancing-modular-quantum-information-processing/
- https://journals.aps.org/prxquantum/abstract/10.1103/PRXQuantum.5.020339
サイドバンドを介したパラメトリック駆動スピン量子ビットの共振器媒介相互作用 Cavity-Mediated Entanglement of Parametrically Driven Spin Qubits via Sidebands
V. Srinivasa, J. M. Taylor, and J. R. Petta
PRX Quantum Published 21 May 2024
DOI:https://doi.org/10.1103/PRXQuantum.5.020339
Abstract
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. For this system, we formulate a model for spin qubit entanglement in the presence of mutually off-resonant qubit and cavity frequencies. We show that the sidebands generated via the driving fields enable highly tunable qubit-qubit entanglement using only ac control and without requiring the qubit and cavity frequencies to be tuned into simultaneous resonance. The model we derive can be mapped to a variety of qubit types, including detuning-driven one-electron spin qubits in double quantum dots and three-electron resonant exchange qubits in triple quantum dots. The high degree of nonlinearity inherent in spin qubits renders these systems particularly favorable for parametric drive-activated entanglement. We determine multiple common resonance conditions for the two driven qubits and the cavity and identify experimentally relevant parameter regimes that enable the implementation of entangling gates with suppressed sensitivity to cavity photon occupation and decay. The parametrically driven sideband resonance approach that we describe provides a promising route toward scalability and modularity in spin-based quantum information processing through drive-enabled tunability that can also be implemented in micromagnet-free electron and hole systems for spin-photon coupling.
