Controlled Quantum Operations of a Semiconductor Three-Qubit System

Abstract

The Coulomb interactions between electrons play important roles in coupling multiple qubits in various quantum systems. Here we demonstrate controlled quantum operations of three electron charge qubits based on three capacitively coupled semiconductor double quantum dots. The strong interactions between one double dot and other two double dots enable us to control the coherent rotations of one target qubit by the states of two control qubits.

Semiconductor quantum computation

“…In 2016, Ward et al also demonstrated controlled rotations for two charge qubits in two coupled Si/SiGe DQDs. To take a step further, in 2018, Li et al demonstrated three-qubit controlled rotations using three coupled GaAs DQDs [121], which is a first attempt to go beyond the two-qubit limit in semiconductor devices and suggests the semiconductor qubits are amenable to large-scale manufacture.…”

Quantum computation based on semiconductor quantum dots

“…如图 11 为两电荷量子比特实验装置示意 图. 紧接着 2016 年, 该研究组利用电容耦合的三个电荷量子比特首次实现了三电荷量子比特的控制 非 (Toffli gate) 的逻辑操作 [32] , 为多量子比特的扩展和长程耦合奠定基础.…”

Correlated spectrum of distant semiconductor qubits coupled by microwave photons

“…They have attracted significant interest [4,5] in systems based on GaAs [6][7][8][9][10][11], Si [12][13][14][15][16][17][18], and Ge [19,20]. However, as the number of qubits increases [21][22][23][24], the coupling of arbitrary pairs of distant qubits and the characterization of coupled qubits remain outstanding challenges.…”

“…Semiconductor quantum dots, which are compatible with conventional manufacturing technology, are a promising candidate for scalable quantum computing (1-3). In semiconductor systems, significant progress has been made over the past decade (4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20). However, as the number of qubits increases (5,21,22), the coupling of arbitrary pairs of distant qubits and the characterization of coupled qubits remain outstanding challenges.…”