Fully Tunable Longitudinal Spin-Photon Interactions in Si and Ge Quantum Dots,Physical Review Letters

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Fully Tunable Longitudinal Spin-Photon Interactions in Si and Ge Quantum Dots
Physical Review Letters ( IF 8.1 ) Pub Date : 2022-08-02 , DOI: 10.1103/physrevlett.129.066801
Stefano Bosco ₁ , Pasquale Scarlino ₂ , Jelena Klinovaja ₁ , Daniel Loss ₁

Affiliation

Spin qubits in silicon and germanium quantum dots are promising platforms for quantum computing, but entangling spin qubits over micrometer distances remains a critical challenge. Current prototypical architectures maximize transversal interactions between qubits and microwave resonators, where the spin state is flipped by nearly resonant photons. However, these interactions cause backaction on the qubit that yields unavoidable residual qubit-qubit couplings and significantly affects the gate fidelity. Strikingly, residual couplings vanish when spin-photon interactions are longitudinal and photons couple to the phase of the qubit. We show that large and tunable spin-photon interactions emerge naturally in state-of-the-art hole spin qubits and that they change from transversal to longitudinal depending on the magnetic field direction. We propose ways to electrically control and measure these interactions, as well as realistic protocols to implement fast high-fidelity two-qubit entangling gates. These protocols work also at high temperatures, paving the way toward the implementation of large-scale quantum processors.

中文翻译：

Si和Ge量子点中完全可调的纵向自旋光子相互作用

硅和锗量子点中的自旋量子位是量子计算的有前途的平台，但在微米距离上纠缠自旋量子位仍然是一个关键挑战。当前的原型架构最大化了量子位和微波谐振器之间的横向相互作用，其中自旋状态被几乎谐振的光子翻转。然而，这些相互作用会导致对量子位的反作用，从而产生不可避免的残余量子位-量子位耦合，并显着影响门保真度。引人注目的是，当自旋光子相互作用是纵向的并且光子耦合到量子比特的相位时，残余耦合消失了。我们表明，在最先进的空穴自旋量子比特中自然出现大且可调谐的自旋光子相互作用，并且它们根据磁场方向从横向变为纵向。我们提出了电子控制和测量这些相互作用的方法，以及实现快速高保真双量子比特纠缠门的现实协议。这些协议也在高温下工作，为实现大规模量子处理器铺平了道路。

更新日期：2022-08-02

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