Article
Chemistry, Multidisciplinary
D. Andrew Golter, Genevieve Clark, Tareq El Dandachi, Stefan Krastanov, Andrew J. Leenheer, Noel H. Wan, Hamza Raniwala, Matthew Zimmermann, Mark Dong, Kevin C. Chen, Linsen Li, Matt Eichenfield, Gerald Gilbert, Dirk Englund
Summary: Researchers have proposed a quantum memory-integrated photonics platform that can integrate multiple diamond color center spins into a programmable photonic integrated circuit and selectively manipulate individual spin qubits using tunable magnetic field gradients, enabling the scalability of quantum networks.
Editorial Material
Biochemistry & Molecular Biology
Anna Schroeder, Johannes J. Letzkus
Summary: Neuropeptides are a diverse class of signaling molecules in the brain, playing important roles in various behavioral functions. However, the specific circuit elements and neuronal computations they control are still unclear. Researchers have discovered how the neuropeptide GRP facilitates memory in the neocortex.
Article
Chemistry, Multidisciplinary
Akhil Varri, Shabnam Taheriniya, Frank Brueckerhoff-Plueckelmann, Ivonne Bente, Nikolaos Farmakidis, Daniel Bernhardt, Harald Roesner, Maximilian Kruth, Achim Nadzeyka, Torsten Richter, Christopher David Wright, Harish Bhaskaran, Gerhard Wilde, Wolfram H. P. Pernice
Summary: This study demonstrates scalable and non-volatile photonic computational memories using automated silicon ion implantation. Precise spectral trimming of large-scale photonic ensembles is achieved with stability and minimal loss penalty. Spectrally aligned photonic memory and computing systems for general matrix multiplication are showcased, enabling wavelength multiplexed integrated architectures at large scales.
ADVANCED MATERIALS
(2023)
Article
Physics, Multidisciplinary
Alkim Bozkurt, Han Zhao, Chaitali Joshi, Henry G. G. LeDuc, Peter K. K. Day, Mohammad Mirhosseini
Summary: In single crystals, the suppression of intrinsic loss channels at low temperatures leads to exceptionally long mechanical lifetimes. Quantum electrical control of such long-lived mechanical oscillators would enable the development of phononic memory elements, sensors, and transducers. Here we present a non-piezoelectric silicon electromechanical system capable of operating in the gigahertz frequency band, demonstrating a parametrically enhanced electromechanical coupling and ground-state operation at millikelvin temperatures. Simultaneously achieving ground-state operation, long mechanical lifetimes, and strong coupling sets the stage for employing silicon electromechanical devices in hybrid quantum systems and studying acoustic loss in the quantum regime.
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.
Article
Nanoscience & Nanotechnology
Shulun Li, Yuhui Yang, Johannes Schall, Martin von Helversen, Chirag Palekar, Hanqing Liu, Leio Roche, Sven Rodt, Haiqiao Ni, Yu Zhang, Zhichuan Niu, Stephan Reitzenstein
Summary: In this work, a monolithic prototype IQPC consisting of two quantum dots deterministically integrated into nano beam cavities was reported. The on-chip beam splitter exhibited a nearly 50/50 splitting ratio and the integrated quantum emitters had high single-photon purity, enabling on-chip Hanbury Brown and Twiss experiments, depicting deterministic scalability. Overall, this marks a cornerstone toward scalable and fully functional IQPCs.
Article
Physics, Multidisciplinary
Alan C. Santos, R. Bachelard
Summary: In this Letter, we demonstrate the efficient generation of entanglement between two artificial giant atoms using photon-mediated interactions in a waveguide. By taking advantage of adjustable decay processes and interference processes, the spontaneous sudden birth of entanglement is significantly enhanced with giant atoms. Highly entangled states can also be generated in the steady-state regime by driving the system with a resonant classical field. We propose using the emitted light statistics as a witness of entanglement, with giant photon bunching observed near maximal entanglement regime. These results pave the way for generating quantum correlations and manipulating photon statistics in systems of giant atoms.
PHYSICAL REVIEW LETTERS
(2023)
Article
Multidisciplinary Sciences
Jia-Shiang Chen, Kasidet Jing Trerayapiwat, Lei Sun, Matthew D. Krzyaniak, Michael R. Wasielewski, Tijana Rajh, Sahar Sharifzadeh, Xuedan Ma
Summary: Researchers report highly confined and long-lived electron spins in chemically functionalized nanotubes and demonstrate their coherent control. These findings indicate that combining molecular approaches with inorganic crystalline systems provides a powerful route for reproducible and scalable quantum materials suitable for qubit applications.
NATURE COMMUNICATIONS
(2023)
Review
Optics
Lantian Feng, Ming Zhang, Jianwei Wang, Xiaoqi Zhou, Xiaogang Qiang, Guangcan Guo, Xifeng Ren
Summary: This paper reviews the research results and state-of-the-art technologies on the silicon photonic chip for scalable quantum applications, pointing out that some components have already met the requirements for further expansion. It also highlights the challenges ahead and future research directions in on-chip scalable quantum information applications.
PHOTONICS RESEARCH
(2022)
Article
Engineering, Electrical & Electronic
Ryotaro Konoike, Akio Yoshizawa, Shu Namiki, Kazuhiro Ikeda
Summary: We studied a 32 x 32 silicon photonic switch that can be used as a programmable multiport interferometer, with stability suitable for both classical and quantum photonic applications. The experimental results demonstrate that our optical circuit has a wide range of potential applications in classical and quantum photonic processors based on a multiport input-output interference design.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Physics, Multidisciplinary
Nathan Schine, Aaron W. Young, William J. Eckner, Michael J. Martin, Adam M. Kaufman
Summary: Long-lived entanglement is a crucial resource for quantum metrology in optical clocks. By leveraging neutral atom arrays and Rydberg interactions, clock-transition Bell states with high fidelity and long coherence times can be generated. The programmable state preparation of strontium-atom pairs in their motional ground state, combined with Rydberg dressing, allows for the generation of Bell states with high fidelity. The resulting long-lived entanglement can enhance metrological stability and bandwidth.
Article
Nanoscience & Nanotechnology
H. Al-Wahsh, L. Dobrzynski, A. Akjouj
Summary: This study reports new bound in continuum states and long-lived resonances in a photonic triangular pyramid with two semi infinite leads. General theorems giving their existence conditions are also provided. By adjusting the lengths of the open loops constituting the pyramid, these resonances can be tuned. The study takes into account the conservation of state number between the final system and the reference system, allowing the identification of all the states and the bound in continuum ones. The findings of this study may have a significant impact on investigations of bound in continuum states, long-lived resonances, and communication technology improvements.
PHOTONICS AND NANOSTRUCTURES-FUNDAMENTALS AND APPLICATIONS
(2022)
Article
Physics, Multidisciplinary
Burak Gurlek, Vahid Sandoghdar, Diego Martin-Cano
Summary: Molecules have been found to possess optomechanical characteristics about a century ago by Raman, and today they are considered promising contenders for high-performance quantum optomechanical platforms due to their small size and large energy-level separations. The challenge lies in the coupling of molecular vibrations to environmental phonons which limits their coherence to picosecond time scales, but strategies such as phononic engineering of the environment can greatly improve their optomechanical quality.
PHYSICAL REVIEW LETTERS
(2021)
Article
Quantum Science & Technology
Niyazi Furkan Bar, Hasan Yetis, Mehmet Karakose
Summary: Nowadays, machine learning techniques are widely applied to various fields, and the idea of using quantum computing to solve problems is gaining popularity. Researchers are experimenting with quantum circuits in machine learning methods to overcome the limitations of qubits. In this study, a variational quantum circuit (VQC) using amplitude encoding is proposed and applied to a navigation problem, showing promising performance.
QUANTUM INFORMATION PROCESSING
(2023)
Article
Chemistry, Multidisciplinary
Minho Choi, Mireu Lee, Sung-Yul L. Park, Byung Su Kim, Seongmoon Jun, Suk In Park, Jin Dong Song, Young-Ho Ko, Yong-Hoon Cho
Summary: In this study, a method is proposed to deterministically integrate single quantum dots with tailor-made photonic structures. A nondestructive luminescence picking method called nanoscale-focus pinspot (NFP) is used to reduce the luminous quantum dot density. The selected quantum dot is then deterministically integrated with a tailor-made photonic structure, leading to improved extraction efficiency.
ADVANCED MATERIALS
(2023)
Article
Optics
John Steinmetz, Kevin Lyons, Meiting Song, Jaime Cardenas, Andrew N. Jordan
Summary: We present an integrated design that utilizes a multi-mode interferometer and weak value amplification to sensitively measure changes in optical frequency. By introducing a weak perturbation to the system and post-selecting the data, the technique amplifies the signal without amplifying the technical noise. Experimental results demonstrate the advantages of a Bragg grating with two band gaps, which provides simultaneous stable high transmission and high dispersion. Compared to free-space setups, the device is more robust, easily scalable, and offers amplified sensitivity compared to other on-chip methods for measuring optical frequency changes, such as an integrated Mach-Zehnder interferometer.
Article
Quantum Science & Technology
Yuan Lee, Eric Bersin, Axel Dahlberg, Stephanie Wehner, Dirk Englund
Summary: The past decade has seen significant progress in experimentally realizing the building blocks of quantum repeaters. A quantum router architecture comprising many quantum memories connected in a photonic switchboard has been proposed to maintain entanglement fidelity over long-distance links and improve entanglement distribution rates. This architecture enables channel-loss-invariant fidelity and automatically prioritizes entanglement flows across the network, without requiring global network information.
NPJ QUANTUM INFORMATION
(2022)
Article
Optics
Rui Tang, Makoto Okano, Kasidit Toprasertpong, Shinichi Takagi, Dirk Englund, Mitsuru Takenaka
Summary: This study proposes a novel photonic integrated circuit (PIC) architecture for accelerated matrix multiplication, addressing the issue of hardware errors increasing with device scale in previous architectures. Additionally, a PIC architecture for general matrix-matrix multiplication (GEMM) is developed to enable high-energy efficiency computing on photonic chips.
Article
Physics, Applied
Hyeongrak Choi, Lamia Ateshian, Mikkel Heuck, Dirk Englund
Summary: The majority of coherent optical radiation sources rely on laser oscillators driven by population inversion. However, accessing the frequency range of 0.1-10 THz (the terahertz gap) remains a challenge. This study proposes a method to produce coherent radiation spanning the THz gap using low-loss dielectric structures. The approach shows potential for high conversion efficiencies and the ability to bridge the THz gap with only 1 W of input power.
PHYSICAL REVIEW APPLIED
(2022)
Article
Materials Science, Multidisciplinary
Yi Zhang, Juniyali Nauriyal, Meiting Song, Marissa Granados Baez, Xiaotong He, Timothy Macdonald, Jaime Cardenas
Summary: By applying an external electric field to silicon nitride (Si3N4) through electrical poling, we successfully induce a bulk second-order nonlinearity (chi(2)), enabling key active functions such as Pockels electro-optic modulation and efficient second harmonic generation. Heating the sample to over 500 degrees C facilitates the poling process. Comparative measurements of the electro-optic responses of poled and non-poled Si3N4 using a Si3N4 micro-ring modulator show a minimum 25-fold enhancement in the r33 electro-optic component. The maximum chi(2) obtained through poling is 0.30 pm/V. The observed improvement in the speed of the measured electro-optic responses from 3 GHz to 15 GHz (3 dB bandwidth) confirms the chi(2) nature of the poled Si3N4. This work opens the way for high-speed active functions on the Si3N4 platform.
OPTICAL MATERIALS EXPRESS
(2023)
Article
Nanoscience & Nanotechnology
Jasvith Raj Basani, Sri Krishna Vadlamani, Saumil Bandyopadhyay, Dirk R. R. Englund, Ryan Hamerly
Summary: This paper presents a novel architecture for multiport interferometers based on the sine-cosine fractal decomposition of a unitary matrix. The unique self-similarity and modularity of our design offer improved resilience to hardware imperfections compared to conventional multiport interferometers. Numerical simulations show that truncation of these meshes gives robust performance even under large fabrication errors, making it a significant advancement in large-scale programmable photonics for practical machine learning and quantum computing applications.
Article
Nanoscience & Nanotechnology
Laura Kim, Hyeongrak Choi, Matthew E. E. Trusheim, Hanfeng Wang, Dirk R. R. Englund
Summary: Nitrogen vacancy centers in diamond provide a spin-based qubit system with long coherence time even at room temperature, making them suitable ambient-condition quantum sensors for quantities including electromagnetic fields, temperature, and rotation. The optically addressable level structures of NV spins allow transduction of spin information onto light-field intensity. The sub-optimal readout fidelity of conventional fluorescence measurement remains a significant drawback for room-temperature ensemble sensing. Here, we discuss nanophotonic interfaces that provide opportunities to achieve near-unity readout fidelity based on IR absorption via resonantly enhanced spin-optic coupling. Spin-coupled resonant nanophotonic devices are projected to particularly benefit applications that utilize micro- to nanoscale sensing volume and to outperform present methods in their volume-normalized sensitivity.
Article
Multidisciplinary Sciences
Hanfeng Wang, Matthew E. Trusheim, Laura Kim, Hamza Raniwala, Dirk R. Englund
Summary: This study proposes a programmable architecture based on diamond color centers driven by electric or strain fields, aiming to reduce power consumption and cross-talk constraints in large-scale quantum networks. By densely packing diamond color centers in a programmable electrode array and driving quantum gates with electric or strain fields, this 'field programmable spin array’ (FPSA) enables high-speed control of individual color centers with low cross-talk and power dissipation. Integrated with a slow-light waveguide for efficient optical coupling, the FPSA serves as a quantum interface for optically-mediated entanglement, showing increased entanglement generation rate scaling into the thousand-qubit regime.
NATURE COMMUNICATIONS
(2023)
Article
Multidisciplinary Sciences
Xiyuan Lu, Mingkang Wang, Feng Zhou, Mikkel Heuck, Wenqi Zhu, Vladimir A. Aksyuk, Dirk R. Englund, Kartik Srinivasan
Summary: The authors demonstrate a method for generating orbital angular momentum (OAM) using photonic crystal ring resonators, while maintaining high cavity quality factors (up to 10^6). By ejecting high angular momentum states of a whispering gallery mode (WGM) microresonator through a grating-assisted mechanism, a scalable and chip-integrated solution for OAM generation is achieved.
NATURE COMMUNICATIONS
(2023)
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
Physics, Applied
Zi-Huai Zhang, Andrew M. Edmonds, Nicola Palmer, Matthew L. Markham, Nathalie P. de Leon
Summary: In this study, it was found that neutral silicon-vacancy (Si-V0) centers can be efficiently stabilized by photoactivated itinerant carriers, enabling resonant optical excitation and optically detected magnetic resonance. This discovery paves the way for on-demand generation of Si-V0 centers and other emerging quantum defects in diamond.
PHYSICAL REVIEW APPLIED
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Alexander Sludds, Ryan Hamerly, Saumil Bandyopadhyay, Zhizhen Zhong, Zaijun Chen, Liane Bernstein, Manya Ghobadi, Dirk Englund
Summary: In this paper, we present experimental demonstrations of ultra-low power edge computing enabled by wavelength division multiplexed optical links and time-integrating optical receivers. The initial experiments show optical energy per MAC less than or similar to 10 fJ.
2022 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC)
(2022)
Article
Optics
Luis Cortes-Herrera, Xiaotong He, Jaime Cardenas, Govind P. Agrawal
Summary: This paper presents a comprehensive theoretical study of energy efficiency in adiabatic frequency conversion (AFC) in an all-pass resonator. The study analyzes the upper limit of energy efficiency using the Cauchy-Schwarz inequality and examines its dependence on input pulse shape.
