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arXiv 1201.4149quant-ph
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光子偏振量子比特在固体中的量子存储

Quantum Storage of a Photonic Polarization Qubit in a Solid

Mustafa Gündoğan, Patrick M. Ledingham, Attaallah Almasi, Matteo Cristiani, Hugues de Riedmatten

摘要:

我们报告的量子存储和检索的光子偏振量子比特到和出的固态存储设备。量子比特在单光子水平上用弱相干态实现,并使用原子频率梳方案在掺杂镨的晶体中存储500 ns,存储和检索效率为10%。我们用量子态层析技术表征了这种存储,发现当平均光子数μ =0.4时,所获得的量子比特的平均条件保真度超过95%。考虑到泊松统计和有限的存储效率,这明显高于经典基准,这证明我们的设备可以作为偏振量子比特的量子存储设备,即使用弱相干态进行测试。这些结果将固态量子存储器的存储能力扩展到偏振编码,偏振编码在量子信息科学中有着广泛的应用。

英文摘要:

We report on the quantum storage and retrieval of photonic polarization quantum bits onto and out of a solid state storage device. The qubits are implemented with weak coherent states at the single photon level, and are stored for 500 ns in a praseodymium doped crystal with a storage and retrieval efficiency of 10%, using the atomic frequency comb scheme. We characterize the storage by using quantum state tomography, and find that the average conditional fidelity of the retrieved qubits exceeds 95% for a mean photon number mu=0.4. This is significantly higher than a classical benchmark, taking into account the Poissonian statistics and finite memory efficiency, which proves that our device functions as a quantum storage device for polarization qubits, even if tested with weak coherent states. These results extend the storage capabilities of solid state quantum memories to polarization encoding, which is widely used in quantum information science.

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