Article
Chemistry, Multidisciplinary
Kinfung Ngan, Yuan Zhan, Constantin Dory, Jelena Vuckovic, Shuo Sun
Summary: This study presents a new technique that allows for the deterministic assembly of diamond color centers in a silicon nitride photonic circuit, enabling maximum light-matter interaction strength and paving the way for scalable manufacturing of large-scale quantum photonic circuits.
Review
Optics
Zong-Quan Zhou, Chao Liu, Chuan-Feng Li, Guang-Can Guo, Daniel Oblak, Mi Lei, Andrei Faraon, Margherita Mazzera, Hugues de Riedmatten
Summary: An optical quantum memory is a device that can store and release photonic quantum information. It is crucial for mitigating channel losses in large-scale quantum networks. Different physical systems such as atomic gases, single atoms in optical cavities, and rare-earth-ion doped solids have been used for realizing optical quantum memories. The focus is now on miniaturization and integration of quantum memories for practical applications in quantum networks, with solid state systems being a favored choice due to their stability and ease of fabrication.
LASER & PHOTONICS REVIEWS
(2023)
Article
Optics
Adrian J. Menssen, Artur Hermans, Ian Christen, Thomas Propson, Chao Li, Andrew J. Leenheer, Matthew Zimmermann, Mark Dong, Hugo Larocque, Hamza Raniwala, Gerald Gilbert, Matt Eichenfield
Summary: Advances in laser technology have driven discoveries in atomic, molecular, and optical physics and applications. To meet the requirements of manipulating light fields at specific wavelengths in the visible or near-infrared spectrum, scientists have proposed an atom control architecture based on photonic integrated circuit technology. They demonstrated a silicon nitride-based atom control device with 16 channels, achieving fast response times and high extinction ratio.
Review
Quantum Science & Technology
Liangliang Lu, Xiaodong Zheng, Yanqing Lu, Shining Zhu, Xiao-Song Ma
Summary: Quantum photonic systems have achieved remarkable success in computing and communication, with photons as carriers of quantum information being highly robust against decoherence. Integrated photonics, compatible with CMOS fabrication, has significant advantages in large-scale quantum information processing. A key task is to improve the performance of individual components and integrate them on a common substrate.
ADVANCED QUANTUM TECHNOLOGIES
(2021)
Article
Nanoscience & Nanotechnology
Mujtaba Zahidy, Yaoxin Liu, Daniele Cozzolino, Yunhong Ding, Toshio Morioka, Leif K. Oxenlowe, Davide Bacco
Summary: Light carrying orbital angular momentum can be utilized for generating high-dimensional quantum states and increasing data capacity, but its technological deployment is limited by the difficulties in fabricating integrated photonic devices. This research demonstrates a photonic integrated chip capable of exciting orbital angular momentum modes in fiber, paving the way for quantum information technologies.
Article
Quantum Science & Technology
Antonio Ortu, Adrian Holzaepfel, Jean Etesse, Mikael Afzelius
Summary: Long-duration quantum memories for photonic qubits are crucial for long-distance quantum networks. This research demonstrates the storage of optical states in coherent spin-waves in rare earth ensembles, achieving long-duration storage of temporal modes and verifying quantum coherence of the memory through qubit analysis.
NPJ QUANTUM INFORMATION
(2022)
Article
Quantum Science & Technology
Antonio Ortu, Jelena Rakonjac, Adrian Holzapfel, Alessandro Seri, Samuele Grandi, Margherita Mazzera, Hugues de Riedmatten, Mikael Afzelius
Summary: Ensemble-based quantum memories are crucial for overcoming the intrinsic rate limitation in long-distance communication. Rare-earth ion doped crystals, with the ability to utilize time, frequency, and spatial multiplexing, are the main candidates for highly multimode quantum memories. This article focuses on atomic frequency comb (AFC) quantum memories, providing theoretical formulas to quantify their temporal multimode capacity. Experimental analysis and prospects for higher capacity in europium- and praseodymium-doped Y2SiO5 crystals are presented, as well as the potential for spectral and spatial multiplexing to further increase mode capacity.
QUANTUM SCIENCE AND TECHNOLOGY
(2022)
Article
Optics
Kevin J. Palm, Mark Dong, D. Andrew Golter, Genevieve Clark, Matthew Zimmermann, Kevin C. Chen, Linsen Li, Adrian Menssen, Andrew J. Leenheer, Daniel Dominguez, Gerald Gilbert, Matt Eichenfield, Dirk Englund
Summary: A central goal is to create interconnected and individually controlled qubit nodes for long-distance quantum networks and distributed quantum computing. Atom-like emitters in diamond have become a leading system for optically networked quantum memories, driving the development of scalable atom control systems. This study introduces a modular architecture of atom-control integrated circuits and artificial atoms embedded in diamond nanostructures for efficient free-space collection. Through a reconfigurable free-space interconnect, single silicon vacancy color centers in individual diamond waveguides are addressed, achieving efficient single photon detection probabilities and low crosstalk for all channels. The modularity of this system simplifies quantum control, potentially enabling scaling to thousands of channels.
Article
Computer Science, Information Systems
Sheng Ming, Jinxian Guo, Yuan Wu, Guzhi Bao, Shuhe Wu, Minwei Shi, Liqing Chen, Weiping Zhang
Summary: Optical quantum memory is a crucial component in the field of quantum technologies. In this study, the researchers demonstrated the optimization of Raman quantum memory using a new method called phase modulation. By applying this method, they achieved a total memory efficiency of 52.7%, which is a 13.3% improvement compared to the best case without phase modulation. The researchers also demonstrated a hybrid method combining phase and intensity modulations, which achieved a memory efficiency of 87.3%.
SCIENCE CHINA-INFORMATION SCIENCES
(2023)
Article
Multidisciplinary Sciences
Xiaogang Qiang, Yizhi Wang, Shichuan Xue, Renyou Ge, Lifeng Chen, Yingwen Liu, Anqi Huang, Xiang Fu, Ping Xu, Teng Yi, Fufang Xu, Mingtang Deng, Jingbo B. Wang, Jasmin D. A. Meinecke, Jonathan C. F. Matthews, Xinlun Cai, Xuejun Yang, Junjie Wu
Summary: Silicon photonics technology allows for the realization of quantum walks with control over particle exchange symmetry and indistinguishability, simulating single-particle walks on larger graphs and showing potential applications in graph theory algorithms.
Article
Optics
Shang-Yu Ren, Wei Yan, Lan-Tian Feng, Yang Chen, Yun-Kun Wu, Xiao-Zhuo Qi, Xiao-Jing Liu, Yu-Jie Cheng, Bo-Yu Xu, Long-Jiang Deng, Guang-Can Guo, Lei Bi, Xi-Feng Ren
Summary: The feasibility of nonreciprocal photonic devices in the quantum world has been investigated. A single-photon non-reciprocal dynamical transmission experiment using an on-chip silicon nitride-based magneto-optical isolator has been performed, achieving a measured isolation ratio of 12.33 dB. The functionality of the on-chip isolator has been proven, and the quantum coherence of the passing single photons has been verified. This work will contribute to the development of on-chip nonreciprocal photonic devices within integrated quantum circuits and introduce novel phenomena in quantum information processes.
LASER & PHOTONICS REVIEWS
(2022)
Article
Chemistry, Physical
Xiong Deng, Shen Shen, Yanli Xu, Jiangtao Liu, Jun Li, Zhenhua Wu
Summary: This study investigates photonic-crystal-like devices and microcavities in graphene. The results show that these graphene-based devices can be significantly smaller in size compared to conventional photonic crystals, thanks to the shorter optical transport wavelength in graphene. By changing the applied voltage, the functionality of the devices can be altered, making them highly programmable and adjustable. Furthermore, these devices can be integrated with traditional microelectronic circuits, leading to potential applications in photonic integrated circuits and computing.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Physical
Xiong Deng, Shen Shen, Yanli Xu, Jiangtao Liu, Jun Li, Zhenhua Wu
Summary: This theoretical study investigates photonic-crystal-like devices and microcavities in graphene. The results show that graphene-based devices can be scaled down significantly compared to conventional photonic crystals due to the shorter optical transport wavelength in graphene. The devices have high programmability and can be integrated with traditional microelectronic circuits, offering potential applications in photonic integrated circuits and computing.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Multidisciplinary Sciences
Jelena Rakonjac, Giacomo Corrielli, Dario Lago-Rivera, Alessandro Seri, Margherita Mazzera, Samuele Grandi, Roberto Osellame, Hugues de Riedmatten
Summary: The deployment of a full-fledged quantum internet requires finding suitable building blocks for entanglement distribution between remote quantum nodes. In this study, we demonstrate a fiber-integrated quantum memory entangled with a photon at telecommunication wavelength, allowing for stable addressing of the memory. Our analysis using fiber-based interferometers shows significant advancements in integrated storage of light-matter entanglement.
Article
Multidisciplinary Sciences
Dong-Chel Shin, Byung Soo Kim, Heesuk Jang, Young-Jin Kim, Seung-Woo Kim
Summary: The authors propose a photonic scheme for terahertz synthesis using an optical frequency comb stabilized to an ultra-low expansion optical cavity. This scheme achieves an unprecedented level of frequency instability of 10(-15) at 1-s integration over the tunable range of 0.1-1.1 THz. The generated terahertz frequencies have an extremely low level of phase noise, which is expected to greatly improve the performance of terahertz radars, molecular spectroscopy, and wireless communications.
NATURE COMMUNICATIONS
(2023)
Article
Physics, Multidisciplinary
Felix Hufnagel, Alicia Sit, Frederic Bouchard, Yingwen Zhang, Duncan England, Khabat Heshami, Benjamin J. Sussman, Ebrahim Karimi
NEW JOURNAL OF PHYSICS
(2020)
Article
Optics
P. Lefebvre, R. Valivarthi, Q. Zhou, L. Oesterling, D. Oblak, W. Tittel
Summary: This paper presents a compact energy-time entangled photon pair source at telecom wavelengths achieved through cascaded second harmonic generation and spontaneous parametric down conversion, with methods introduced to diminish the effects of Raman scattering. The quality of energy-time entanglement produced by the source is analyzed using two-photon interference and Franson interference, with high visibilities of 93.9% +/- 0.4% and 90.5% +/- 0.6% achieved.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2021)
Article
Physics, Applied
Frederic Bouchard, Duncan England, Philip J. Bustard, Kate L. Fenwick, Ebrahim Karimi, Khabat Heshami, Benjamin Sussman
Summary: Quantum communication is fundamentally limited by noise, and overcoming noise is crucial for achieving better communication effects. This study proposes a quantum communication platform based on ultrafast optical techniques, which enables high rates and near single-mode quantum signal filtering to dramatically reduce channel noise and improve noise tolerance.
PHYSICAL REVIEW APPLIED
(2021)
Article
Physics, Multidisciplinary
Mohsen Falamarzi Askarani, Antariksha Das, Jacob H. Davidson, Gustavo C. Amaral, Neil Sinclair, Joshua A. Slater, Sara Marzban, Charles W. Thiel, Rufus L. Cone, Daniel Oblak, Wolfgang Tittel
Summary: The study investigates the optical properties of Tm: Y3Ga5O12 and demonstrates its potential for creating multiplexed quantum memories with long optical storage times. Methods to narrow the gap between measured storage time values and the maximum value are discussed.
PHYSICAL REVIEW LETTERS
(2021)
Article
Quantum Science & Technology
Jacob Taylor, Sumit Goswami, Valentin Walther, Michael Spanner, Christoph Simon, Khabat Heshami
Summary: This study demonstrates the feasibility of using a mesoscopic array of excitons to simulate quantum many-body dynamics by studying the Rydberg excitation dynamics. We show that the Z(2)-ordered phase can be reached by optimizing the physical parameters available, such as those for cuprous oxide (Cu2O), in terms of driving laser parameters. An application example of using this proposed system to solve the maximum independent set problem based on the Rydberg blockade effect is also studied.
QUANTUM SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Multidisciplinary
Aaron Z. Goldberg, Khabat Heshami
Summary: We demonstrate that the quantum advantage relative to classical probe light can still be maintained even when the detectors fire due to dark counts and other spurious events. We show in detail how the quantum advantage depends on dark counts and increases with Fock-state-probe strength. These results are especially pertinent as the present capabilities of PNRDs are being dramatically improved.
MEASUREMENT SCIENCE AND TECHNOLOGY
(2023)
Article
Physics, Multidisciplinary
Aaron Z. Goldberg, Khabat Heshami
Summary: Estimating transmission or loss is essential in spectroscopy. This study demonstrates a paradigm using squeezed light to simultaneously measure distinct loss parameters in both modes, providing quantum advantages. The experiment is conducted on Xanadu's X8 chip accessed via the cloud, achieving convergence in maximum likelihood estimation and shedding light on the performance of real quantum devices.
NEW JOURNAL OF PHYSICS
(2022)
Article
Physics, Multidisciplinary
Aaron Z. Goldberg, Khabat Heshami
Summary: Quantum technologies often require pure states produced by extreme refrigeration. The heat-bath algorithmic cooling is a theoretically optimal technique, but we demonstrate a method that surpasses it by utilizing a single binary-outcome measurement. Our protocols, using a quantum switch, can create arbitrary numbers of pure quantum states with no residual mixedness, certified by postselection.
JOURNAL OF PHYSICS COMMUNICATIONS
(2023)
Article
Optics
Aaron Z. Goldberg, Guillaume S. Thekkadath, Khabat Heshami
Summary: Coherence is fundamental to quantum phenomena and plays a role in classical theories as well, but understanding its significance can be challenging. The quadrature coherence scale (QCS) was developed to precisely quantify quantum features in a single-mode bosonic system without bias towards any specific phase space orientation. The QCS can be calculated for any state and reduces to well-known quantities in certain limits, making it a valuable tool for measuring coherence. Recent progress has allowed for the measurement of QCS in squeezed light and thermal states using Xanadu's machine Borealis, which offers the necessary components for precise measurements. The results confirm the utility of interferometers and photon-counting devices in verifying quantum properties.
Article
Quantum Science & Technology
Frederic Bouchard, Duncan England, Philip J. Bustard, Khabat Heshami, Benjamin Sussman
Summary: The photonic temporal degree of freedom is a promising platform for quantum communication. Despite the challenges in detecting photonic time-bin states, the feasibility of picosecond time-bin states for quantum communication has been experimentally demonstrated.
Article
Materials Science, Multidisciplinary
Jacob H. Davidson, Philip J. T. Woodburn, Aaron D. Marsh, Kyle J. Olson, Adam Olivera, Antariksha Das, Mohsen Falamarzi Askarani, Wolfgang Tittel, Rufus L. Cone, Charles W. Thiel
Summary: This study characterizes the magnetic properties of thulium ion energy levels in the Y3Ga5O12 (Tm:YGG) lattice to improve decoherence and reduce linewidth broadening. By measuring hyperfine tensors and analyzing the orientation dependence of the Tm3+ ion's spin Hamiltonian, the research proposes orientations to enhance material properties for light-matter interaction and quantum information applications. Important external field directions identified include extending optical coherence times, improving spin inhomogeneous broadening, maximising mixing of spin states for specific ion sets to enhance optical pumping and lambda systems in the material.
Article
Optics
Aaron Z. Goldberg, Khabat Heshami
Summary: Beam splitters are used to generate entanglement between modes in optical and microwave domains. The entanglement is not a convex combination of coherent states. Squeezed-vacuum states can both minimize and maximize the notions of quantumness, with the resolution of this paradox depending on the relative phases between input states and devices.
Article
Materials Science, Multidisciplinary
Neil Sinclair, Daniel Oblak, Erhan Saglamyurek, Rufus L. Cone, Charles W. Thiel, Wolfgang Tittel
Summary: The study characterizes the optical coherence and energy-level properties of Tm3+ in a Ti4+ :LiNbO3 waveguide, finding consistency between indiffused Tm-3(+) :Ti-4(+) :LiNbO3 and bulk-doped Tm-3(+) :LiNbO3 crystal properties. These results support the use of rare-earth ions for integrated optical and quantum signal processing, complementing previous research in a narrower parameter space.
Article
Optics
Jacob H. Davidson, Pascal Lefebvre, Jun Zhang, Daniel Oblak, Wolfgang Tittel
Article
Physics, Multidisciplinary
Marcel li Grimau Puigibert, Mohsen Falamarzi Askarani, Jacob H. Davidson, Varun B. Verma, Matthew D. Shaw, Sae Woo Nam, Thomas Lutz, Gustavo C. Amaral, Daniel Oblak, Wolfgang Tittel
PHYSICAL REVIEW RESEARCH
(2020)