研究目的
To develop a high-performance atomic Raman memory with high efficiency and fidelity in room temperature atoms using optimal control techniques.
研究成果
The study demonstrates a high-performance Raman quantum memory with 82.0% efficiency and 98.0% fidelity, exceeding the no-cloning limit. It shows potential for practical applications in quantum information processing due to its broadband capability and room-temperature operation.
研究不足
The memory bandwidth is limited by the available intensity modulators and electronics, with a shortest pulse duration of 6 ns. Decoherence time is limited by atomic diffusion, and further improvements in optical depth and temporal control could enhance efficiency.
1：Experimental Design and Method Selection:
The experiment involves a Raman quantum memory setup using 87Rb atomic vapor in a paraffin-coated cell at 78.5 °C. An optimal control technique is applied to the write pulse to enhance memory efficiency. The method includes iterative optimization of the write pulse shape based on theoretical models from ref.
2：5 °C. An optimal control technique is applied to the write pulse to enhance memory efficiency. The method includes iterative optimization of the write pulse shape based on theoretical models from ref. Sample Selection and Data Sources:
32. 2. Sample Selection and Data Sources: The core component is a 87Rb atomic vapor cell (10.0 cm long, 1.0 cm diameter) heated to 78.5 °C. Atoms are initially prepared in the |m> = |5^2S_{1/2}, F=2> state using an optical pumping pulse.
3：0 cm long, 0 cm diameter) heated to 5 °C. Atoms are initially prepared in the |m> = |5^2S_{1/2}, F=2> state using an optical pumping pulse. List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment includes semiconductor lasers (Toptica DLPro + Boosta), acousto-optic modulators (AOMs), Pockels cell (Conoptics Model No. 360-80), Glan polarizers, beam splitters, piezoelectric transducer, photo-detectors (D1, D2, D3), single-photon detector (D4), etalons, and oscilloscopes. Materials include the paraffin-coated glass cell and rubidium atoms.
4：Experimental Procedures and Operational Workflow:
The process starts with optical pumping to prepare atoms. The input signal pulse Ein is stored as an atomic spin wave using a write pulse with optimized temporal shape. After a delay, the spin wave is retrieved using a read pulse. Detection methods include intensity detection for efficiency calibration, homodyne detection with tomography for fidelity measurement, and single-photon detection for noise analysis.
5：Data Analysis Methods:
Data analysis involves calculating efficiencies from intensity measurements, reconstructing density matrices using maximum-likelihood methods for fidelity, and statistical analysis of noise. Theoretical fits are used to compare with experimental results.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容-
semiconductor laser
DLPro + Boosta
Toptica
Generate strong driving beams for write and read pulses
-
acousto-optic modulator
Control intensities and temporal shapes of laser beams
-
Pockels cell
360-80
Conoptics
Control temporal shape of input signal pulse
-
Glan polarizer
Spatial overlap and separation of optical fields
-
beam splitter
Split and combine optical beams in the setup
-
piezoelectric transducer
Vary the phase of the local oscillator in homodyne detection
-
photo-detector
D1, D2, D3
Detect optical signals for intensity measurements
-
single-photon detector
D4
Detect single photons for noise analysis
-
etalon
Filter leaked driving photons
-
oscilloscope
Record and display signal waveforms
-
atomic vapor cell
Contain 87Rb atoms for the memory medium
-
登录查看剩余9件设备及参数对照表
查看全部
