Zhuo‐Zhi Zhang

Realizing scalable conditional operations through auxiliary energy levels

Sheng Zhang, Peng Duan, Yun-Jie Wang, Tian-Le Wang et autres

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Spectator Leakage Suppression via Invariant Subspace Engineering for cz Gates in Superconducting Quantum Circuits

Anonymous, Bin-Han Lu, Tian-Le Wang, Sheng Zhang et autres

Spectator leakage poses a fundamental challenge to scalable quantum computing, particularly as frequency collisions become unavoidable in multiqubit processors. We introduce a leakage mitigation strategy based on dynamically reshaping the system Hamiltonian. Our technique utilizes a tunable coupler to enforce a block-diagonal …

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Phase-Diagram-Like Map of Strong Two-Tone Spectroscopy in a Graphene Nanomechanical Resonator

Lei Guo-sheng, Zi-Xuan Chen, Yi-Bo Wang, Chen‐Xu Wu et autres

Abstract Strong two-tone driving can generate rich nonlinear dynamics in micro- and nanomechanical resonators, including a period-doubling route to chaos, pulse-width-modulated oscillations, and dynamical phase transitions. However, these separate dynamical examples do not provide a unified spectroscopic picture of the strong two-tone …

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Demonstrating Coherent Quantum Routers for Bucket-Brigade Quantum Random Access Memory on a Superconducting Processor

Anonymous, Yun-Jie Wang, Peng Wang, Ren-Ze Zhao et autres

Quantum routers (QRouters) are essential components of bucket-brigade quantum random access memory (QRAM), enabling quantum applications such as Grover’s search and quantum machine learning. Despite significant theoretical advances, achieving scalable and coherent QRouters experimentally remains challenging. Here, we demonstrate coherent quantum routers …

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Temperature-dependent surface-confined Rayleigh-wave propagation in GaAs down to 1 K

Lei Guo-sheng, Yucheng Wu, Xiang‐Xiang Song, Zhuo‐Zhi Zhang et autres

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Graphene nanomechanical sensing of trap-assisted charge dynamics in leaky silicon oxide

F L Chen, Zixin Gu, Youlong Xian, W Song et autres

Nanomechanical resonators can detect electronic degrees of freedom through their sensitivity to small electrical forces. Here, we use few-layer graphene membranes as nanomechanical probes to investigate the slow dynamics of injected charge carriers in a trap-rich, leaky dielectric substrate. The dielectric consists …

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Design and analysis of a flip-chip architecture for SAW-DQD strong coupling

Yibo Wang, Xiang‐Xiang Song, Zhuo‐Zhi Zhang, Guo‐Ping Guo

Abstract Surface acoustic wave (SAW) resonators offer distinct advantages for coupling to semiconductor qubits, including low loss, high stability, and compatibility with magnetic fields. However, the integration of SAW resonators with double quantum dots (DQDs) that host charge and spin qubits remains …

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Spectator Leakage Suppression via Invariant Subspace Engineering for CZ Gates in Superconducting Quantum Circuits

Peng Wang, Bin-Han Lu, Tian-Le Wang, Sheng Zhang et autres

Spectator leakage poses a fundamental challenge to scalable quantum computing, particularly as frequency collisions become unavoidable in multi-qubit processors. We introduce a leakage mitigation strategy based on dynamically reshaping the system Hamiltonian. Our technique utilizes a tunable coupler to enforce a block-diagonal …

Acoustic detection of high-resistance states in gated bilayer graphene devices

Guo‐Quan Qin, Yi-Bo 奕博 Wang 王, Zhuo‐Zhi Zhang, Xiang‐Xiang Song et autres

Abstract Applying a perpendicular electric field to bilayer graphene (BLG) induces an electrically tunable bandgap, so that insulating states with resistances exceeding ∼10 8 Ω can be generated. These high-resistance states pinch off the conducting channel, thereby enabling high-quality gated devices for …

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Hysteretic responses of nanomechanical resonators based on crumpled few-layer graphene

Heng Lu, Yang Chen, Ce Zhang, YuBin Zhang et autres

The process of suspending two-dimensional materials over cavities etched in a substrate occasionally results in crumpled membranes. Their complicated morphologies feature an abundance of folds, creases, and wrinkles that make each crumpled membrane unique. Here, we prepare five nanomechanical resonators based on …

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Electrically Tunable Graphene Nanomechanical Resonators

Yibo Wang, Zhuo‐Zhi Zhang, Chen‐Xu Wu, Yushi Zhang et autres

Abstract The excellent mechanical properties make graphene promising for realizing nanomechanical resonators with high resonant frequencies, large quality factors, strong nonlinearities, and the capability to effectively interface with various physical systems. Equipped with gate electrodes, it has been demonstrated that these exceptional …

Demonstrating Coherent Quantum Routers for Bucket-Brigade Quantum Random Access Memory on a Superconducting Processor

Sheng Zhang, Yun-Jie Wang, Peng Wang, Ren-Ze Zhao et autres

Quantum routers (QRouters) are essential components of bucket-brigade quantum random access memory (QRAM), enabling quantum applications such as Grover's search and quantum machine learning. Despite significant theoretical advances, achieving scalable and coherent QRouters experimentally remains challenging. Here, we demonstrate coherent quantum routers …