Lindner Netanel H, Rudolph Terry
Department of Physics, Technion-Israel Institute of Technology, 32000 Haifa, Israel.
Phys Rev Lett. 2009 Sep 11;103(11):113602. doi: 10.1103/PhysRevLett.103.113602. Epub 2009 Sep 8.
We present a method to convert certain single photon sources into devices capable of emitting large strings of photonic cluster state in a controlled and pulsed "on-demand" manner. Such sources would greatly reduce the resources required to achieve linear optical quantum computation. Standard spin errors, such as dephasing, are shown to affect only 1 or 2 of the emitted photons at a time. This allows for the use of standard fault tolerance techniques, and shows that the photonic machine gun can be fired for arbitrarily long times. Using realistic parameters for current quantum dot sources, we conclude high entangled-photon emission rates are achievable, with Pauli-error rates per photon of less than 0.2%. For quantum dot sources, the method has the added advantage of alleviating the problematic issues of obtaining identical photons from independent, nonidentical quantum dots, and of exciton dephasing.
我们提出了一种方法，可将某些单光子源转换为能够以可控的脉冲“按需”方式发射大量光子簇态序列的装置。此类光源将极大减少实现线性光学量子计算所需的资源。标准自旋误差，如退相，被证明一次仅影响1个或2个发射的光子。这使得能够使用标准容错技术，并表明光子机枪可以任意长时间发射。使用当前量子点光源的实际参数，我们得出可以实现高纠缠光子发射率，每个光子的泡利误差率小于0.2%。对于量子点光源，该方法还有一个额外优势，即缓解了从独立的、不相同的量子点获取相同光子以及激子退相这些问题。
