Article
Optics
John Hannegan, James D. Siverns, Qudsia Quraishi
Summary: This research demonstrates entanglement between matter and photons in quantum networks, interaction and conversion at different wavelengths, and a decrease in fidelity due to reduced signal-to-noise ratio of detectors.
Article
Optics
Bjoern Haase, Mirco Kutas, Felix Riexinger, Patricia Bickert, Andreas Keil, Daniel Molter, Michael Bortz, Georg von Freymann
Summary: This erratum corrects two typing errors in a previously published manuscript, which were limited to theoretical derivation and did not affect numerical calculations, results, or conclusions.
Article
Physics, Multidisciplinary
Stefan Richter, Sebastian Wolf, Joachim von Zanthier, Ferdinand Schmidt-Kaler
Summary: Cross-correlation signals are analyzed to determine spatial frequency and distance of ions, showing excellent agreement with independent measurements. The method is shown to be effective for two-dimensional arrays of emitters, providing structural information where direct imaging techniques fail.
PHYSICAL REVIEW LETTERS
(2021)
Article
Optics
Yu Lu Wang, Ya Yang, Jing Lu, Lan Zhou
Summary: This study investigates the coherent scattering of photons in two waveguides coupled to an A-type three-level system (3LS). By adjusting the applied field on the 3LS, the tunneling paths between the waveguides can be controlled, and the number of bi-photon bound states and their interference pattern can be manipulated.
Article
Optics
Laura Mercade, Maria Morant, Amadeu Griol, Roberto Llorente, Alejandro Martinez
Summary: Optomechanical cavities facilitate the coupling of near-infrared light and GHz-frequency acoustic waves, enabling non-linear mixing and local oscillation functions in the optical domain. By utilizing a silicon OM crystal cavity, efficient frequency down- and up-conversion of MHz-bandwidth orthogonal frequency division multiplexed signals is achieved, paving the way for low-power all-photonic processing of digitally modulated microwave signals in miniaturized silicon photonics chips.
LASER & PHOTONICS REVIEWS
(2021)
Article
Physics, Multidisciplinary
Pengfei Yang, Gang Li, Zhihui Wang, Pengfei Zhang, Tiancai Zhang
Summary: The fidelity and coherence time of gate operations on neutral atoms trapped in an optical dipole trap are crucial for their applications. The motion of the trapped atoms, considered as a classical oscillator in previous analyses, is now treated as a quantum oscillator. The influence of the atom's motion on gate fidelity and decoherence is studied by analyzing the population on its vibrational states. It is discovered that the fidelity of a coherent rotation gate is significantly limited by the temperature of the trapped atom. However, the dephasing between hyperfine states caused by the thermal motion of the atom can naturally rephase under certain stable conditions. Additionally, the decoherence due to fluctuations of the trap laser intensity is discussed. Cooling the atom into vibrational ground states and/or using a blue-detuned trap can greatly enhance both gate fidelity and coherence time. Furthermore, a "magic" trapping condition is proposed by preparing the atom into specific vibrational states.
NEW JOURNAL OF PHYSICS
(2022)
Article
Optics
Alan Kahan, Leonardo Ermann, Cecilia Cormick
Summary: In this study, a numerical analysis of the fully quantum state in the few-photon regime was conducted, revealing an increase in system entropy and entanglement in the transition region, but no clear signs of metastability in the evolution spectrum.
Article
Physics, Multidisciplinary
Xiao-Feng Shi
Summary: This paper presents two solutions to the challenge of Rydberg excitation in alkaline-earth-like atoms with complicated nuclear spin states. The first theory involves exciting two nuclear spin qubit states to Rydberg states with detuning from a weak magnetic field, while the second theory demonstrates a two-photon Rydberg excitation with only one nuclear spin qubit state. These theories offer a versatile approach to quantum computation leveraging Rydberg blockade and nuclear-spin quantum memory advantages.
FRONTIERS OF PHYSICS
(2021)
Article
Optics
Panqiang Kang, Xinlu Zhang, Xiaofan Jing, Conghui Chen, Shuai Pang, Jinjer Huang
Summary: A dual-wavelength passively Q-switched self-Raman laser in the 2.5 μm wave band using Cr:ZnS as a saturable absorber was demonstrated. Synchronized dual-wavelength pulsed laser outputs at 2473nm and 2520nm were obtained, corresponding to Raman frequency shifts of 808 cm(-1) and 883 cm(-1), respectively. The maximum total average output power of 114.9mW was achieved at specific conditions.
Article
Physics, Applied
Uday Saha, James D. Siverns, John Hannegan, Mihika Prabhu, Qudsia Quraishi, Dirk Englund, Edo Waks
Summary: In this work, we demonstrate the routing of single photons from a trapped ion using a photonic integrated circuit. The emission of the ion is matched to the operating wavelength of the circuit through quantum frequency conversion. Programmable phase shifters are used to switch the single photons between output channels and achieve a 50:50 beam splitting condition. These results are important for programmable routing and entanglement distribution in large-scale quantum networks and distributed quantum computers.
PHYSICAL REVIEW APPLIED
(2023)
Article
Nanoscience & Nanotechnology
Than Singh Saini, Shilpi Arora, V. R. Supradeepa
Summary: The study presents the design and numerical analysis of a tellurium oxide rib waveguide for wavelength conversion using femtosecond laser pulses. This waveguide device achieves a large detuning in the frequencies, making it suitable for various potential applications.
Article
Optics
Miao Guo, Kong Zhang, Yunhao Zhang, Jun He, Junmin Wang
Summary: This paper achieves the conversion of 852 nm photons to 1560 nm photons in quantum nodes based on the nonlinear wavelength conversion technology. Noise suppression is realized by using FBG filter. The experimental results show that using a narrower bandwidth filter can significantly improve the signal-to-noise ratio (SNR).
Article
Optics
Wei-Hang Zhang, Ying-Hao Ye, Lei Zeng, Ming-Xin Dong, En-Ze LI, Jing-Yuan Peng, Yan LI, Dong-Sheng Ding, Bao-Sen Shi
Summary: In this experiment, the frequency down-conversion through the four-wave mixing process in a cold 85Rb atomic ensemble was investigated. The results showed that the frequency-conversion efficiency can reach up to 32% with an improvement in the optical depth. It was also found that the efficiency may exceed 32% when the signal-to-noise ratio of the detected telecom field is higher than 10 and the mean signal count is larger than 0.2. This work can be combined with quantum memories based on cold 85Rb ensemble to serve for long-distance quantum networks.
Article
Optics
Matthias Heinzig, Gonzalo Palma-Vega, Benjamin Yildiz, Till Walbaum, Thomas Schreiber, Andreas Tuennermann
Summary: This study presents a high brightness cascaded Stokes diamond Raman laser pumped by an Yd-doped fiber laser, generating an output power of 63W in continuous-wave mode. The laser achieved over 30% conversion efficiency by utilizing a highly resonant cavity for the first Stokes and high outcoupling for the second Stokes (45%). Thermal limitations and temporal behavior of intra-cavity power for the first and second Stokes were also investigated.
Article
Quantum Science & Technology
Stefan Krastanov, Kurt Jacobs, Gerald Gilbert, Dirk R. Englund, Mikkel Heuck
Summary: In this work, we propose an architecture for achieving high-fidelity deterministic quantum logic gates on dual-rail encoded photonic qubits. The qubits are manipulated by allowing photons to interact with a two-level emitter (TLE) inside an optical cavity. We use a quantum control process to actively load and unload photons from the cavity, while dynamically altering their effective coupling to the TLE. Our numerical simulations show that III-V quantum dots in GaAs membranes hold promise as a platform for photonic quantum information processing.
NPJ QUANTUM INFORMATION
(2022)
Article
Optics
T. Seifert, S. Jaiswal, U. Martens, J. Hannegan, L. Braun, P. Maldonado, F. Freimuth, A. Kronenberg, J. Henrizi, I. Radu, E. Beaurepaire, Y. Mokrousov, P. M. Oppeneer, M. Jourdan, G. Jakob, D. Turchinovich, L. M. Hayden, M. Wolf, M. Muenzenberg, M. Klaeui, T. Kampfrath
Article
Quantum Science & Technology
James D. Siverns, Qudsia Quraishi
QUANTUM INFORMATION PROCESSING
(2017)
Article
Optics
J. D. Siverns, L. R. Simkins, S. Weidt, W. K. Hensinger
APPLIED PHYSICS B-LASERS AND OPTICS
(2012)
Article
Physics, Multidisciplinary
James D. Siverns, Seb Weidt, Kim Lake, Bjoern Lekitsch, Marcus D. Hughes, Winfried K. Hensinger
NEW JOURNAL OF PHYSICS
(2012)
Article
Physics, Multidisciplinary
A. N. Craddock, J. Hannegan, D. P. Ornelas-Huerta, J. D. Siverns, A. J. Hachtel, A. Goldschmidt, J. V. Porto, Q. Quraishi, S. L. Rolston
PHYSICAL REVIEW LETTERS
(2019)
Article
Multidisciplinary Sciences
J. D. Siverns, J. Hannegan, Q. Quraishi
Article
Physics, Applied
J. Hannegan, U. Saha, J. D. Siverns, J. Cassell, E. Waks, Q. Quraishi
Summary: The study successfully demonstrates the frequency conversion of visible photons emitted from a trapped Ba+ ion into the telecommunications C-band, which is a crucial step towards establishing a long-distance trapped ion quantum internet.
APPLIED PHYSICS LETTERS
(2021)
Article
Optics
John Hannegan, James D. Siverns, Jake Cassell, Qudsia Quraishi
Summary: This research proposes a hybrid networking architecture to improve entanglement rates in quantum networks based on trapped ions by incorporating neutral-atom-based nondestructive single-photon detection and single-photon storage. By using this new method, the remote entanglement rates can be up to 100 times larger than an equivalent homogeneous network at both near-IR and C-band wavelengths for distances up to 50 km.
Article
Optics
J. D. Siverns, X. Li, Q. Quraishi