Department of Physics, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA.
Phys Rev Lett. 2012 Apr 6;108(14):140503. doi: 10.1103/PhysRevLett.108.140503. Epub 2012 Apr 4.
We propose a quantum dot qubit architecture that has an attractive combination of speed and fabrication simplicity. It consists of a double quantum dot with one electron in one dot and two electrons in the other. The qubit itself is a set of two states with total spin quantum numbers S(2)=3/4 (S=1/2) and S(z)=-1/2, with the two different states being singlet and triplet in the doubly occupied dot. Gate operations can be implemented electrically and the qubit is highly tunable, enabling fast implementation of one- and two-qubit gates in a simpler geometry and with fewer operations than in other proposed quantum dot qubit architectures with fast operations. Moreover, the system has potentially long decoherence times. These are all extremely attractive properties for use in quantum information processing devices.
我们提出了一种具有吸引力的速度和制造简单性组合的量子点qubit 架构。它由一个双量子点组成，一个点中有一个电子，另一个点中有两个电子。qubit 本身是一组具有总自旋量子数 S(2)=3/4 (S=1/2)和 S(z)=-1/2 的两个状态，两个不同的状态是在双占据点中的 singlet 和 triplet。门操作可以通过电来实现，并且 qubit 具有很高的可调性，与具有快速操作的其他提出的量子点 qubit 架构相比，可以在更简单的几何形状和更少的操作中快速实现单量子比特和双量子比特门。此外，该系统具有潜在的长退相干时间。这些都是在量子信息处理设备中使用的极具吸引力的特性。
