Experimental realization of 105-qubit random access quantum memory

Jiang, Nan; Pu, Yunfei; Chang, Wei; C, Li; Zhang, S.; Duan, Luming

doi:10.1038/s41534-019-0144-0

Cited by 56 publications

(29 citation statements)

References 37 publications

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“…It is mainly caused by the limited optical depth of the atomic ensemble, ranging from 5 at the center to below 2 on the edge of the array. Compared with the previous experiments where the stored photon is from a weak laser pulse [15,34], the retrieval efficiency here is generally lower because the idler photon generated from the cascaded spontaneous emission has a broader spectrum [12], which leads to a lower absorption rate.…”

Section: Characterization Of Multiplexed Quantum Memorymentioning

confidence: 65%

“…The Doppler cooling and polarization gradient cooling (PGC) stages of MOT B follow the steps of Ref. [34]. After the PGC cooling, we get an atomic ensemble in MOT B with a diameter of about 3.5 mm, a temperature of about 50 μK, and an optical depth (OD) of 5 at the center of the ensemble resonant to the jai ¼ j5S…”

Section: Discussionmentioning

confidence: 99%

“…The setup and control of each AOD follow the steps of Ref. [34]. We adjust the apparatus such that the horizontal and vertical polarization components of the idler photon overlap with the control beam on each memory cell to achieve the highest EIT efficiency.…”

Section: Multiplexing and Demultiplexing Optical Circuitsmentioning

confidence: 99%

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Long-Distance Entanglement between a Multiplexed Quantum Memory and a Telecom Photon

Chang

et al. 2019

Phys. Rev. X

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Realization of long-distance quantum communication through the quantum repeater network requires a combination of some key elements, including a multiplexed quantum memory for storage of entanglement and a telecom photon for propagation of information through the fiber. Although impressive experimental advances have demonstrated the individual elements, combining these key capabilities together and realizing them in a single experimental system remains a significant challenge. Here, we report an experimental realization of long-distance entanglement between a multiplexed quantum memory with 49 individually accessible memory cells and a telecom photon after transmission in a 10-km optical fiber. Excitation of an atomic ensemble generates narrow-band polarization entanglement between a telecom photon of 1530-nm wavelength and another photon of 780-nm wavelength, which is then stored into a memory cell of a multiplexed atomic quantum memory and read out after a controllable delay. The entanglement is verified through quantum-state tomography after quantum storage in the atomic memory and fiber transmission of the telecom photon. This experiment demonstrates an important step towards realization of long-distance quantum communication networks.

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Section: Characterization Of Multiplexed Quantum Memorymentioning

confidence: 65%

Section: Discussionmentioning

confidence: 99%

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Long-Distance Entanglement between a Multiplexed Quantum Memory and a Telecom Photon

Chang

et al. 2019

Phys. Rev. X

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“…The most complicated quantum operators in above proposed algorithms and protocols are to generate the quantum Bloom filter and compute the oracle operator ̃, which can be implemented by introducing quantum Random Access Memory (qRAM). At present, there have appeared experimental results of qRAM [27][28][29]. Furthermore, by Ref.…”

Section: Multiparty Private Set Intersection Cardinalitymentioning

confidence: 95%

Quantum Bloom Filter and Its Applications

Shi

2021

IEEE Trans. Quantum Eng.

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A quantum Bloom filter is a spatially more efficient data structure, which is used to represent a set of elements by using (log) qubits. In this paper, we define and design a quantum Bloom filter and its corresponding algorithms. Due to the reversibility of quantum operators, it can not only add a new element to a quantum Bloom filter but also delete an existing element from the quantum Bloom filter. Furthermore, we employ the quantum Bloom filter to solve two private issues, i.e., Oblivious Setmember Decision and Multiparty Private Set Intersection Cardinality. The results show that the quantum Bloom filter has inherent advantages in privacy-preserving applications concerning set operations.

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“…This limitation can be resolved with spatial (dynamic-access) multiplexing instead of temporal multiplexing. In fact, a random-access quantum memory (RAQM) with an architecture resembling that of a classical random-access memory has been developed recently 16,17 . This device can in principle receive and send an almost arbitrarily large number of qubits, limited only by the ratio of qubit coherence time to qubit access time.…”

Section: Introductionmentioning

confidence: 99%

A network-ready random-access qubits memory

et al. 2020

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Photonic qubits memories are essential ingredients of numerous quantum networking protocols. The ideal situation features quantum computing nodes that are efficiently connected to quantum communication channels via quantum interfaces. The nodes contain a set of long-lived matter qubits, the channels support the propagation of light qubits, and the interface couples light and matter qubits. Toward this vision, we here demonstrate a random-access multi-qubit write-read memory for photons using two rubidium atoms coupled to the same mode of an optical cavity, a setup that is known to feature quantum computing capabilities. We test the memory with more than ten independent photonic qubits, observe no noticeable cross-talk, and find no need for re-initialization even after ten write-read attempts. The combined write-read efficiency is 26% and the coherence time approaches 1 ms. With these features, the node constitutes a promising building block for a quantum repeater and ultimately a quantum internet.

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Experimental realization of 105-qubit random access quantum memory

Cited by 56 publications

References 37 publications

Long-Distance Entanglement between a Multiplexed Quantum Memory and a Telecom Photon

Long-Distance Entanglement between a Multiplexed Quantum Memory and a Telecom Photon

Quantum Bloom Filter and Its Applications

A network-ready random-access qubits memory

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