Quantronics group, SPEC (CNRS URA 2464), IRAMIS, DSM, CEA-Saclay, 91191 Gif-sur-Yvette, France.
Phys Rev Lett. 2011 Nov 25;107(22):220501. doi: 10.1103/PhysRevLett.107.220501. Epub 2011 Nov 21.
We report the experimental realization of a hybrid quantum circuit combining a superconducting qubit and an ensemble of electronic spins. The qubit, of the transmon type, is coherently coupled to the spin ensemble consisting of nitrogen-vacancy centers in a diamond crystal via a frequency-tunable superconducting resonator acting as a quantum bus. Using this circuit, we prepare a superposition of the qubit states that we store into collective excitations of the spin ensemble and retrieve back into the qubit later on. These results constitute a proof of concept of spin-ensemble based quantum memory for superconducting qubits.
我们报告了一种混合量子电路的实验实现，该电路结合了超导量子比特和电子自旋体。该量子比特为超导谐振器型，通过充当量子总线的可调谐超导谐振器与由钻石晶体中的氮空位中心组成的自旋体相干耦合。使用这个电路，我们制备了一个量子比特状态的叠加态，我们将其存储在自旋体的集体激发中，稍后再将其取回量子比特中。这些结果构成了基于自旋体的超导量子比特量子存储器的概念验证。
