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arXiv 2106.05079quant-ph
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通信光子与按需多模固态量子存储器之间的纠缠

Entanglement between a telecom photon and an on-demand multimode solid-state quantum memory

Jelena V. Rakonjac, Dario Lago-Rivera, Alessandro Seri, Margherita Mazzera, Samuele Grandi, Hugues de Riedmatten

摘要:

通信波长的光子与长寿命量子存储器之间的纠缠是长距离量子通信的基本要求之一。具有按需读出和多模操作功能的量子存储器是额外的宝贵资产,将有利于通信速率。在这项工作中,我们报告的第一个演示之间的纠缠电信光子和集体自旋激发多模固态量子存储器。光子对是通过广泛的非简并参量下转换产生的,其特征在于电信波长闲频和可见光信号光子之间的能量-时间纠缠。后者使用全原子频率梳方案作为自旋波存储在Pr $^{3+}$:Y $_2$ SiO $_5$晶体中。然后,我们召回存储的信号光子,并使用Franson方案分析纠缠。我们测量激发态存储的$92(2)\%$的条件重复性,足以违反CHSH不等式,以及自旋波存储的$77(2)\%$。利用自旋态的按需读出,我们将纠缠存储在量子存储器中的时间延长到47.7~ $μ$ s,这使得纠缠可以在相距10 km的量子节点之间分配.

英文摘要:

Entanglement between photons at telecommunication wavelengths and long-lived quantum memories is one of the fundamental requirements of long-distance quantum communication. Quantum memories featuring on-demand read-out and multimode operation are additional precious assets that will benefit the communication rate. In this work we report the first demonstration of entanglement between a telecom photon and a collective spin excitation in a multimode solid-state quantum memory. Photon pairs are generated through widely non-degenerate parametric down-conversion, featuring energy-time entanglement between the telecom-wavelength idler and a visible signal photon. The latter is stored in a Pr$^{3+}$:Y$_2$SiO$_5$ crystal as a spin wave using the full Atomic Frequency Comb scheme. We then recall the stored signal photon and analyze the entanglement using the Franson scheme. We measure conditional fidelities of $92(2)\%$ for excited-state storage, enough to violate a CHSH inequality, and $77(2)\%$ for spin-wave storage. Taking advantage of the on-demand read-out from the spin state, we extend the entanglement storage in the quantum memory for up to 47.7~$μ$s, which could allow for the distribution of entanglement between quantum nodes separated by distances of up to 10 km.

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