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The electron spin state of a singly charged semiconductor quantum dot hasbeen shown to form a suitable single qubit for quantum computing architectureswith fast gate times. A key challenge in realizing a useful quantum dot quantumcomputing architecture lies in demonstrating the ability to scale the system tomany qubits. In this letter, we report an all optical experimentaldemonstration of quantum entanglement between a single electron spin confinedto single charged semiconductor quantum dot and the polarization state of aphoton spontaneously emitted from the quantum dot's excited state. We obtain alower bound on the fidelity of entanglement of 0.59, which is 84% of themaximum achievable given the timing resolution of available single photondetectors. In future applications, such as measurement based spin-spinentanglement which does not require sub-nanosecond timing resolution, weestimate that this system would enable near ideal performance. The inferred(usable) entanglement generation rate is 3 x 10^3 s^-1. This spin-photonentanglement is the first step to a scalable quantum dot quantum computingarchitecture relying on photon (flying) qubits to mediate entanglement betweendistant nodes of a quantum dot network.

Demonstration of quantum entanglement between a single electron spin confined to an InAs quantum dot and a photon