A quantum state light-storage, using a virtual magnetic field through the ac Stark effect is proposed to combine the high overall storage efficiency and large bandwidth employing room temperature atomic vapor. In this approach, which was called the ac Stark Gradient Echo Memory (ASGEM), it has been shown the possibility to employ about a nanosecond ac Stark pulse far detuned (about 127 THz) from D1 line of rubidium and create an atomic media with the possibility to store a photon with about a GHz bandwidth with storage and retrieval efficiency of more than 90%. A contour plot of efficiency as a function of gradient field strength and optical depth, based on three-level Maxwell- Bloch equations, simulated for a better understanding of experimental parameter optimization.
Realization of Backward Retrieval in a Stark-modulated Spin-wave Quantum Memory
Southern University of Science and Technology（南方科技大学）；International Quantum Academy, and Shenzhen Branch, Hefei National Laboratory（国际量子学院合肥国家实验室深圳分院）；CAS Key Laboratory of Quantum Information, University of Science and Technology of China（中国科学院量子信息重点实验室中国科学技术大学）；Anhui Province Key Laboratory of Quantum Network, University of Science and Technology of China（安徽省量子网络重点实验室中国科学技术大学）；CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China（中国科学院量子信息与量子物理前沿卓越创新中心中国科学技术大学）；Hefei National Laboratory, University of Science and Technology of China（合肥国家实验室中国科学技术大学）
Photon echoes in rare-earth-doped crystals are studied to understand the challenges of making broadband quantum memories using the atomic frequency comb (AFC) protocol in systems with hyperfine structure. The hyperfine structure of Pr^{3+} poses an obstacle to this goal because frequencies associated with the hyperfine transitions change the simple picture of modulation at an externally imposed frequency. The current work focuses on the intermediate case where the hyperfine spacing is comparable to the comb spacing, a challenging regime that has recently been considered. Operating in this regi…
Quantum memories for quantum communication need to be able to store photons for an extended time and then to release them on demand. This can be achieved in atomic frequency comb ensemble based quantum memories by control pulses that transfer the excitation to and from long-lived spin states. However, such pulses can give rise to coherent and incoherent noise due to their interaction with the memory ensemble. In this article, we experimentally demonstrate the ability to switch off the coherent noise from such control pulses during the echo emission in a spin-wave quantum memory, using the line…
Spectroscopic investigations of a Ti:Tm:LiNbO3 waveguide for photon-echo quantum memory
本文报道了Ti $^{4+}$：Tm $^{3+}$：LiNbO $_3$光波导在光子回波量子存储器中的应用。特别是，我们通过吸收，光谱烧孔，光子回波和斯塔克光谱研究了室温和低温性能。我们发现$^3$ H $_4$和$^3$ F $_4$能级的辐射寿命分别为82 ms和2.4 ms，并且从$^3$ H $_{4}$到$^3$ F $_4$能级的分支比为44%。我们还测量了$^3$ H $_6\leftrightarrow{}^3$ H $_4$，795 nm波长跃迁的光学相干时间为1.6 $μ$ s，并研究了光谱扩散对光谱烧孔的限制。在施加几百高斯的磁场后，我们观察到了持续存在的光谱空穴，寿命可达几秒钟。此外，我们测量了25 kHz $\cdot$ cm/V的线性斯塔克位移。我们的结果是有希望的集成，电光，光子的波导量子存储器。
Evolution of homonuclear J-coupling during t1 period creates Zero Quantum artefacts which seriously degrade the performance of 2D NOESY. In our previous work [28], it is demonstrated that creation of such artefacts can be prevented by incorporation of a perfect echo based broadband homo-nuclear decoupling technique during t1 period that also allows chemical shift encoding. However, such experiments have limited F1 resolution as the perfect echo based decoupling remains efficient for interpulse delay 2τ (=t1) short compared to 1/J. A solution to this problem is provided in the present work wher…
Broadband and Large-Multimode Quantum Optical Storage with Rare-Earth Ions in Solids
Chimie ParisTech, PSL University, CNRS, Institut de Recherche de Chimie Paris（巴黎高等化学学院，PSL大学，法国国家科学研究中心，巴黎化学研究所）；Institute for Quantum Materials and Technologies (IQMT), Karlsruhe Institute of Technology（卡尔斯鲁厄理工学院量子材料与技术研究所）；Institut de Chimie Moléculaire et des Matériaux d’Orsay CNRS, Université Paris-Saclay UMR 8182（奥赛分子与材料化学研究所，法国国家科学研究中心，巴黎-萨克雷大学）；Institute of Nanotechnology (INT), Karlsruhe Institute of Technology（卡尔斯鲁厄理工学院纳米技术研究所）；Karlsruhe Nano Micro Facility (KNMFi), Karlruhe Institute of Technology (KIT)（卡尔斯鲁厄纳米微设施，卡尔斯鲁厄理工学院）；Centre Européen de Sciences Quantiques (CESQ), Institut de Science et d’Ingénierie Supramoléculaires (ISIS), Strasbourg（欧洲量子科学中心，超分子科学与工程研究所，斯特拉斯堡）
Center for Theoretical Physics of Complex Systems, Institute for Basic Science（复杂系统理论物理中心，基础科学研究院）；Department of Physics and Astronomy, Center for Materials Theory, Rutgers University（物理与天文学系，材料理论中心，罗格斯大学）；Physics Department, Columbia University（物理系，哥伦比亚大学）；Basic Science Program, Korea University of Science and Technology (UST)（基础科学项目，韩国科学技术院）
