Swap Test with Quantum-Dot Charge Qubits

• URL: http://arxiv.org/abs/2112.15517v1
• Date: Fri, 31 Dec 2021 15:30:03 GMT
• Title: Swap Test with Quantum-Dot Charge Qubits
• Authors: Y.-D. Li, N. Barraza, G. Alvarado Barrios, E. Solano, and F. Albarr\'an-Arriagada
• Abstract summary: We propose the implementation of the Swap Test using a charge qubit in a double quantum dot. This work paves the way for enhancing the toolbox of quantum machine learning developments in semiconductor qubits.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We propose the implementation of the Swap Test using a charge qubit in a double quantum dot. The Swap Test is a fundamental quantum subroutine in quantum machine learning and other applications for estimating the fidelity of two unknown quantum states by measuring an auxiliary qubit. Our proposal uses a controlled three-qubit gate which is natural to quantum-dot charge qubits. It allows us to implement a Swap Test with a circuit depth of six layers, and an estimated gate time of less than 3 ns, that is below the coherence time of double quantum dots. This work paves the way for enhancing the toolbox of quantum machine learning developments in semiconductor qubits.

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