Remote capacitive sensing in two-dimension quantum-dot arrays

Abstract

We investigate gate-defined quantum dots in silicon on insulator nanowire field-effect transistors fabricated using a foundry-compatible fully-depleted silicon-on-insulator (FD-SOI) process. A series of split gates wrapped over the silicon nanowire naturally produces a $2\times n$ bilinear array of quantum dots along a single nanowire. We begin by studying the capacitive coupling of quantum dots within such a 2$\times$2 array, and then show how such couplings can be extended across two parallel silicon nanowires coupled together by shared, electrically isolated, 'floating' electrodes. With one quantum dot operating as a single-electron-box sensor, the floating gate serves to enhance the charge sensitivity range, enabling it to detect charge state transitions in a separate silicon nanowire. By comparing measurements from multiple devices we illustrate the impact of the floating gate by quantifying both the charge sensitivity decay as a function of dot-sensor separation and configuration within the dual-nanowire structure.

arXiv comment9 pages, 3 figures, 35 cites and supplementary

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Cited by in corpus (16)

• Scaling silicon-based quantum computing using CMOS technology: State-of-the-art, Challenges and Perspectives
• Review of performance metrics of spin qubits in gated semiconducting nanostructures
• Probing quantum devices with radio-frequency reflectometry
• Single-electron control in a foundry-fabricated two-dimensional qubit array
• Universal control of four singlet-triplet qubits
• A two-dimensional array of single-hole quantum dots
• Single-electron operation of a silicon-CMOS 2x2 quantum dot array with integrated charge sensing
• Single-shot readout of multiple donor electron spins with a gate-based sensor
• Dispersive readout of reconfigurable ambipolar quantum dots in a silicon-on-insulator nanowire
• A quantum dot-based frequency multiplier
• Automatic virtual voltage extraction of a 2x2 array of quantum dots with machine learning
• Gate reflectometry in dense quantum dot arrays
• An elongated quantum dot as a distributed charge sensor
• Quantum estimation and remote charge sensing with a hole-spin qubit in silicon
• A 2x2 quantum dot array in silicon with fully tuneable pairwise interdot coupling
• Single electron routing in a silicon quantum-dot array