Multiplexed storage and real-time manipulation based on a multiple degree-of-freedom quantum memory

Yang, Taotao; Zhou, Zong‐Quan; Hua, Yi-Lin; Liu, Xiao; Li, Zongfeng; Li, Pei-Yun; Ma, Yu; Liu, Chao; Liang, Peng-Jun; Li, Xue; Xiao, Yixin; Hu, J.; Li, Chuan‐Feng; Guo, Guang‐Can

doi:10.1038/s41467-018-05669-5

Cited by 121 publications

(70 citation statements)

References 49 publications

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“…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.…”

Section: Introductionmentioning

confidence: 99%

Reliable coherent optical memory based on a laser-written waveguide

Liu¹,

Zhou²,

Zhu³

et al. 2020

Optica

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151 Eu 3+ -doped yttrium silicate ( 151 Eu 3+ : Y 2 SiO 5 ) crystal is a unique material that possesses hyperfine states with coherence time up to 6 h. Many efforts have been devoted to the development of this material as optical quantum memories based on the bulk crystals, but integrable structures (such as optical waveguides) that can promote 151 Eu 3+ : Y 2 SiO 5 -based quantum memories to practical applications, have not been demonstrated so far. Here we report the fabrication of type II waveguides in a 151 Eu 3+ : Y 2 SiO 5 crystal using femtosecond-laser micromachining. The resulting waveguides are compatible with single-mode fibers and have the smallest insertion loss of 4.95 dB. On-demand light storage is demonstrated in a waveguide by employing the spinwave atomic frequency comb (AFC) scheme and the revival of silenced echo (ROSE) scheme. We implement a series of interference experiments based on these two schemes to characterize the storage fidelity. Interference visibility of the readout pulse is 0.99 ± 0.03 for the spin-wave AFC scheme and 0.97 ± 0.02 for the ROSE scheme, demonstrating the reliability of the integrated optical memory.

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Section: Introductionmentioning

confidence: 99%

Reliable coherent optical memory based on a laser-written waveguide

Liu¹,

Zhou²,

Zhu³

et al. 2020

Optica

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“…In the future, our multiplexed atom-cavity system may be combined with nonlinear cavity-mediated interactions or quantum nondemolition measurements that would enable universal quantum operations between spin waves. The demonstration here, of spin-wave multiplexed cavity electrodynamics, is a significant step toward these goals.Our apparatus is complementary to an active body of ensemble multiplexing research, using both spatial and spectral degrees of freedom [13][14][15][16][17][18][19][20][21][22][23]. Recently, a spatial array of single-photon detectors has been used to resolve 665 independent spin waves in an atomic ensemble [24,25].…”

mentioning

confidence: 99%

Spin-Wave Multiplexed Atom-Cavity Electrodynamics

et al. 2019

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We introduce multiplexed atom-cavity quantum electrodynamics with an atomic ensemble coupled to a single optical cavity mode. Multiple Raman dressing beams establish cavity-coupled spinwave excitations with distinctive spatial profiles. Experimentally, we demonstrate the concept by observing spin-wave vacuum Rabi splittings, selective superradiance, and interference in the cavitymediated interactions of two spin waves. We highlight that the current experimental configuration allows rapid, interchangeable cavity-coupling to 4 profiles with an overlap parameter of less than 10%, enough to demonstrate, for example, a quantum repeater network simulation in the cavity. With further improvements to the optical multiplexing setup, we infer the ability to access more than 10 3 independent spin-wave profiles.Significant resources are now being devoted to develop intermediate scale quantum systems with tens or hundreds of quantum bits, tunable interactions, and independent control of each element. Ion traps [1], superconducting circuits [2], tweezer arrays of neutral atoms [3], and other systems have made exciting recent advances, but scaling precise quantum dynamics from few-body to many-body remains as a primary challenge in quantum science.Instead of building up qubit-by-qubit, like the aforementioned platforms, here we focus on a system where quantum information is stored as patterns or images inside a single cavity-coupled atomic ensemble containing up to 10 6 atoms. This scalability more closely resembles, for example, that of a neural network, where data is stored and manipulated as patterns and images rather than binary bits [4][5][6][7].In this Letter, we introduce an apparatus that allows creation of multiple spin-wave excitations with unique spatial profiles. The spin waves are all collectively enhanced to emit into a single TEM00 cavity mode, and cavity coupling of each spin wave is dynamically controlled using a corresponding Raman dressing beam, generated by a two-dimensional acousto-optic deflector. Experimentally, we first observe strong spin wave/cavity interactions by measuring a dressed-state vacuum Rabi splitting (VRS) associated with the spin-wave Raman transition. Second, we discuss how spin waves are protected from cross-talk through collective dephasing, and demonstrate a high degree of distinguishability by observing selective superradiance over the continuum of spin-wave profiles. Finally, we observe interference as two spin-waves simultaneously interact with the cavity mode.As a multiplexed atom-cavity interface [8], our system may form the building block of a scalable quantum repeater [9]. Alternatively, this approach opens an elegant avenue to demonstrate a local bosonic quantum network for efficiently simulating many-body physics [10-12], generating samples from exponentially complex wave functions, or performing entanglement-enhanced or error-corrected quantum sensing. In the future, our multiplexed atom-cavity system may be combined with nonlinear cavity-mediated interactions or quantum nond...

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“…In absence of the frequency multiplexing operation of the quantum memory [42], the multiple-mode state cannot be applied directly. Most of the current experiments of spin-wave storage only support light sources with bandwidths of approximately 3 MHz [27,28].…”

Section: Quantum Characteristics Of the Single-photon Sourcementioning

confidence: 99%