Storage of multiple single-photon pulses emitted from a quantum dot in a solid-state quantum memory

Abstract

Quantum repeaters are critical components for distributing entanglement over long distances in presence of unavoidable optical losses during transmission. Stimulated by the Duan–Lukin–Cirac–Zoller protocol, many improved quantum repeater protocols based on quantum memories have been proposed, which commonly focus on the entanglement-distribution rate. Among these protocols, the elimination of multiple photons (or multiple photon-pairs) and the use of multimode quantum memory are demonstrated to have the ability to greatly improve the entanglement-distribution rate. Here, we demonstrate the storage of deterministic single photons emitted from a quantum dot in a polarization-maintaining solid-state quantum memory; in addition, multi-temporal-mode memory with 1, 20 and 100 narrow single-photon pulses is also demonstrated. Multi-photons are eliminated, and only one photon at most is contained in each pulse. Moreover, the solid-state properties of both sub-systems make this configuration more stable and easier to be scalable. Our work will be helpful in the construction of efficient quantum repeaters based on all-solid-state devices.

Reliable coherent optical memory based on a laser-written waveguide

“…Optical quantum memories, which can map quantum information between light and matter with high fidelity, are crucial devices in the implementation for large-scale quantum networks[1] [2]. As a promising candidate for this device, quantum memories with high fidelity [1] [3] [4], multi-mode capacity [4][5][6][7] as well as long storage time [8] [9], have been demonstrated in bulk rare-earth-ion-doped crystals. To promote this remarkable device to practical application, many efforts have been devoted to the development of integrated quantum memories.…”

New breakthrough of multifunctional solid state quantum memory

“…如何实现千千米量级的长程 量子通信是量子通信领域面临的重要难题之一. 目前物理 上的解决方案有两种: 第一种是基于量子中继 [1] , 利用短 程的量子纠缠和量子存储器实现长程的量子纠缠, 再利用 量子隐形传态等实现量子通信; 第二种是直接把量子信息 存储到寿命超长的量子存储器 [2] 态量子存储器, 构建了基于两种异种固态系统的雏形量子 网络 [4] ; (2) 首次实现轨道角动量量子态以及高维纠缠态 的固态量子存储 [5] ; (3) 首次实现时间、空间、频率3个自 由度并行复用的多功能固态量子存储, 并演示量子信息在 不同模式间的变换 [6] ; (4) 首次在毫米尺寸实现宏观实在 性(Leggett-Garg不等式)的严格检验, 为解决薛定谔猫佯谬 问题提供了新思路 [7] .…”

Experimental realization of 105-qubit random access quantum memory

“…A convenient implementation of the quantum interface is based on the directional coupling of an ensemble of atoms with the forward propagating signal photon pulse induced by the collective enhancement effect [2][3][4][5][6]11]. A number of experiments have demonstrated this kind of quantum interfaces and their applications both in the atomic ensemble [11][12][13][14][15][16][17][18][19][20][21][22][23] and the solid-state spin ensemble with a low-temperature crystal [24][25][26][27][28][29].…”

“…To scale up the capability of a quantum memory, which is important for its application, an efficient method is to use the memory multiplexing, based on the use of multiple spatial modes [17,20], or temporal modes [25,26,28,29], or angular directions [21] within a single atomic or solid-state ensemble. Through multiplexing of spatial modes, recent experiments have realized a dozen to hundreds of memory cells in a single atomic ensemble, however, write-in and read-out of external quantum signals have not been demonstrated yet [17,20].…”

“…Through multiplexing of spatial modes, recent experiments have realized a dozen to hundreds of memory cells in a single atomic ensemble, however, write-in and read-out of external quantum signals have not been demonstrated yet [17,20]. With temporal multiplexing, a sequence of time-bin qubits have been stored into a solid-state ensemble, however, the whole pulse sequence needs to be read out together with a fixed order and interval between the pulses for lack of individual addressing [26,28,29]. It remains a challenge to demonstrate a RAQM with programmable and on-demand control to write-in and read-out of each individual quantum signals stored into the memory cells.…”