{"id":149988,"date":"2021-01-08T15:18:59","date_gmt":"2021-01-08T12:18:59","guid":{"rendered":"https:\/\/en.buradabiliyorum.com\/researchers-achieve-on-demand-storage-in-integrated-solid-state-quantum-memory\/"},"modified":"2021-01-08T15:18:59","modified_gmt":"2021-01-08T12:18:59","slug":"researchers-achieve-on-demand-storage-in-integrated-solid-state-quantum-memory","status":"publish","type":"post","link":"https:\/\/buradabiliyorum.com\/en\/researchers-achieve-on-demand-storage-in-integrated-solid-state-quantum-memory\/","title":{"rendered":"#Researchers achieve on-demand storage in integrated solid-state quantum memory"},"content":{"rendered":"

“#Researchers achieve on-demand storage in integrated solid-state quantum memory<\/strong>”<\/p>\n

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\"Researchers
\n Figure 1 (a)\u00a0Level structure of 151 Eu 3 + ions at zero magnetic field. (b)\u00a0Diagram of the experimental setup. The acoustic optic modulators labeled as AOM 1 and AOM 2 are employed to generate the preparation and input beams. The input and preparation beams are combined by a beam splitter (BS) with a reflection-to-transmission ratio of 90 \u2236 10 . The combined beam is coupled into the waveguide and then collected into a single-mode fiber with a lens group. The mechanical shutter 1 and shutter 2 ensure that the single-photon detector is protected from the strong preparation light. Inset: top view of the on-chip quantum memory under a microscope. Six tracks are fabricated on the sample with a spacing of 23 \u03bc m , forming five type IV waveguides. The central one with the minimum insertion loss is employed for the quantum storage. Silver lines provide the electric field for storage time control. FC: Fiber coupler, HWP:half-wave plate. Phys. Rev. Lett. 125, 260504
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Researchers from CAS Key Laboratory of Quantum Information of the University of Science<\/a> and Technology<\/a> of China (USTC) of the Chinese Academy of Sciences have demonstrated on-demand storage of photonic qubits in an integrated solid-state quantum memory for the first time. This work was published in Physics Review Letters<\/i>.<\/p>\n


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Quantum memory is the core technology for building large-scale quantum networks. Quantum repeaters or quantum hard drives, based on quantum memories, can effectively overcome photon loss in the channel, thus extending the working distance of quantum networks.<\/p>\n

On-demand storage requires determination of the storage time after the photon has been absorbed by the quantum memory, which is essential for quantum networks. However, integrated solid-state quantum memories demonstrated so far are all based on the atomic frequency comb (AFC) scheme with a predetermined storage time.<\/p>\n

In order to achieve on-demand storage, the researchers adopted a modified quantum memory scheme: the Stark-modulated AFC scheme. They made use of the Stark effect to manipulate the evolution of the rare-earth ions in real-time by introducing two electrical pulses to control the storage time of the quantum memory.<\/p>\n

The researchers first used a femtosecond laser micromachining (FLM) system to fabricate optical waveguides on the surface of a europium-doped yttrium silicate crystal, and then placed two on-chip electrodes on both sides of the optical waveguides, so that the storage time could be controlled in real-time with a transistor-transistor logic (TTL)-compatible voltage. The insertion loss of the optical waveguide was below 1 dB, which is currently the best value reported for integrated solid-state quantum memories.<\/p>\n

They demonstrated on-demand storage of time-bin qubits with such integrated solid-state quantum memory, with a storage fidelity of 99.3%\u00b10.2%. This result is close to the best storage fidelity achieved with in bulk crystals (99.9%, PRL108, 190505) which was also reported by the same research group in 2012. The high fidelity indicates the reliability of this integrated quantum memory.<\/p>\n

This work is of great importance for building large-capacity quantum memory and constructing quantum networks.<\/p>\n\n

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Researchers achieve multifunctional solid-state quantum memory\n <\/p><\/div>\n

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\n More information:<\/strong>
\n Chao Liu et al. On-Demand Quantum Storage of Photonic Qubits in an On-Chip Waveguide, Physical Review Letters<\/i> (2020). DOI: 10.1103\/PhysRevLett.125.260504<\/a><\/p><\/div>\n
\n Provided by
\n Chinese Academy of Sciences
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Citation<\/strong>:
\n Researchers achieve on-demand storage in integrated solid-state quantum memory (2021, January 8)
\n retrieved 8 January 2021
\n from https:\/\/phys.org\/news<\/a>\/2021-01-on-demand-storage-solid-state-quantum-memory.html<\/p>\n

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