Toward high-dimensional-state quantum memory in a cold atomic ensemble

Ding, Dong-Sheng; Zhang, Wei; Zhou, Zhi-Yuan; Shi, Shuai; Pan, Jian-Song; Xiang, Guo-Yong; Wang, Xishi; Jiang, Yun-Kun; Shi, Bao‐Sen; Guo, Guang‐Can

doi:10.1103/physreva.90.042301

Cited by 29 publications

(27 citation statements)

References 29 publications

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“…Before verifying the high-dimensional entanglement, the correlations in the OAM space between the two ensembles before and after storage were first measured. The results are shown in 2(a)]; this is similar to the result that was obtained when using a weak coherent light [6]. The different storage efficiencies measured for different OAM modes m are shown in Fig.…”

Section: Resultssupporting

confidence: 81%

“…Next, we verified the entanglement with d=3. We projected the signal-1 and signal-2 photons onto SLM 1 and SLM 2, respectively, with nine different phase states |ψ 19 > corresponding to states |L>, |G>, |R>, (|G>+|L>)/2 1/2 , (|G>+|R>)/2 1/2 , (|G>+i|L>)/2 1/2 , (|G>-i|R>)/2 1/2 , (|L>+|R>)/2 1/2 , and (|L>+i|R>)/2 1/2 [6,32], where |L>, |G>, and |R> are states corresponding to a well-defined OAM of −ћ, 0, and +ћ, respectively. With this projection, the mirrors and lens should be considered due to the photon's transformation during the imaging process.…”

Section: Resultsmentioning

confidence: 99%

“…In demonstrating three-dimensional entanglement, the fidelity was affected by the distinct storing efficiencies [ Fig. 2(d)] for different OAM modes [6], narrowing the spiral bandwidth of the OAM modes. We can improve the entanglement fidelity by purifying the entangled state [10,45].…”

Section: By Assuming the Correlationsmentioning

confidence: 99%

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High-dimensional entanglement between distant atomic-ensemble memories

et al. 2016

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Entangled quantum states in high-dimensional space show many advantages compared with entangled states in two-dimensional space. The former enable quantum communication with higher channel capacity, enable more efficient quantum-information processing and are more feasible for closing the detection loophole in Bell test experiments. Establishing high-dimensional entangled memories is essential for long-distance communication, but its experimental realization is lacking. We experimentally established high-dimensional entanglement in orbital angular momentum space between two atomic ensembles separated by 1 m. We reconstructed the density matrix for a three-dimensional entanglement and obtained an entanglement fidelity of (83.9±2.9)%. More importantly, we confirmed the successful preparation of a state entangled in more than three-dimensional space (up to seven-dimensional) using entanglement witnesses. Achieving high-dimensional entanglement represents a significant step toward a high-capacity quantum network.

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Section: Resultssupporting

confidence: 81%

Section: Resultsmentioning

confidence: 99%

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High-dimensional entanglement between distant atomic-ensemble memories

et al. 2016

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“…Although this work is a proof of principle, it makes an important step toward realizing high-dimensional quantum memory. In 2014, this research group reported a demonstration of quantum memory storing a photon encoded in a three-dimensional space 43 . In 2015, Zhou et al .…”

Section: Methodsmentioning

confidence: 99%

Deterministic secure quantum communication using a single d-level system

Jiang

Chen

et al. 2017

Sci Rep

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Deterministic secure quantum communication (DSQC) can transmit secret messages between two parties without first generating a shared secret key. Compared with quantum key distribution (QKD), DSQC avoids the waste of qubits arising from basis reconciliation and thus reaches higher efficiency. In this paper, based on data block transmission and order rearrangement technologies, we propose a DSQC protocol. It utilizes a set of single d-level systems as message carriers, which are used to directly encode the secret message in one communication process. Theoretical analysis shows that these employed technologies guarantee the security, and the use of a higher dimensional quantum system makes our protocol achieve higher security and efficiency. Since only quantum memory is required for implementation, our protocol is feasible with current technologies. Furthermore, Trojan horse attack (THA) is taken into account in our protocol. We give a THA model and show that THA significantly increases the multi-photon rate and can thus be detected.

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“…Pioneering works of quantum memories with high dimension states have been demonstrated in both crystal 6,[9][10][11] and atomic ensemble 12,13 by using angular modes, 14 spatial modes, 15 time-bin modes, 16 and OAM modes. 12 Among these proposals, the OAM mode with infinite-dimensional spanning in Hilbert space makes it an excellent candidate for high dimensional quantum memories.…”

Section: Introductionmentioning

confidence: 99%

Towards efficient quantum memory of orbital angular momentum qubits in cold atoms

Wang,

Yu,

Chen

et al. 2020

Preprint

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The spatial modes of light, carrying a quantized amount of orbital angular momentum (OAM), is one of the excellent candidates that provides access to high-dimensional quantum states, which essentially makes it promising towards building high-dimensional quantum networks. In this paper, we report the storage and retrieval of photonic qubits encoded with OAM state in the cold atomic ensemble, achieving an average conditional fidelity above 98% and retrieval efficiency around 65%. The photonic OAM qubits are encoded with weak coherent states at the single-photon level and the memory is based on electromagnetically induced transparency in an elongated cold rubidium atomic ensemble. Our work constitutes an efficient node that is needed towards high dimensional and large scale quantum networks.

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Toward high-dimensional-state quantum memory in a cold atomic ensemble

Cited by 29 publications

References 29 publications

High-dimensional entanglement between distant atomic-ensemble memories

High-dimensional entanglement between distant atomic-ensemble memories

Deterministic secure quantum communication using a single d-level system

Towards efficient quantum memory of orbital angular momentum qubits in cold atoms

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