自旋量子比特通过离域激子相互作用的量子计算：克服空穴混合
Quantum Computing with Spin Qubits Interacting Through Delocalized Excitons: Overcoming Hole Mixing
摘要：
作为可控耦合量子比特的候选方案，我们考虑了两个量子点，每个量子点都掺杂一个电子，电子的自旋定义了我们的量子比特基，并且可以通过使用偏振光来创建trion态;我们证明了激发trion的形式取决于量子比特的状态。通过使用Luttinger-Kohn哈密顿量，我们计算了在轻重空穴混合的存在下这些trion态的形式，并表明它们可以通过Förster转移和静态偶极-偶极相互作用相互作用。最后，我们证明，通过使用啁啾激光脉冲，它是可能的，在这个系统中执行一个两个量子比特的门，作为激光失谐的函数的本征态。这些门是鲁棒的，因为它们以任何实际程度的空穴混合操作，并且用于任一类型的trion-trion耦合。
英文摘要：
As a candidate scheme for controllably coupled qubits, we consider two quantum dots, each doped with a single electron. The spin of the electron defines our qubit basis and trion states can be created by using polarized light; we show that the form of the excited trion depends on the state of the qubit. By using the Luttinger-Kohn Hamiltonian we calculate the form of these trion states in the presence of light-heavy hole mixing, and show that they can interact through both the Förster transfer and static dipole-dipole interactions. Finally, we demonstrate that by using chirped laser pulses, it is possible to perform a two-qubit gate in this system by adiabatically following the eigenstates as a function of laser detuning. These gates are robust in that they operate with any realistic degree of hole mixing, and for either type of trion-trion coupling.
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