Article
Physics, Multidisciplinary
B. D. Hauer, J. Combes, J. D. Teufel
Summary: We propose a technique to generate cat states of motion using the intrinsic nonlinearity of a dispersive optomechanical interaction. By applying a bichromatic drive to an optomechanical cavity, our protocol enhances the inherent second-order processes of the system, inducing the requisite two-phonon dissipation. We show that this nonlinear sideband cooling technique can dissipatively engineer a mechanical resonator into a cat state, which we verify using the full Hamiltonian and an adiabatically reduced model.
PHYSICAL REVIEW LETTERS
(2023)
Article
Optics
Elad Zohar, Yanay Florshaim, Oded Zilberman, Amir Stern, Yoav Sagi
Summary: We report the implementation of degenerate Raman sideband cooling of 40K atoms. The scheme incorporates a three-dimensional optical lattice and optical pumping beams for closing the cooling cycle. With this method, we achieve a temperature of about 1 μK and a phase space density of 10-3 for a cloud of 107 atoms. The spin-polarized fermionic ensemble is favorable for subsequent evaporative cooling.
Article
Optics
Chang Huang, Shijie Chai, Shau-Yu Lan
Summary: This study utilizes dark-state sideband cooling to cool an ensemble of Rb-85 atoms in an optical lattice, achieving subrecoil temperatures below 100 nK. The results demonstrate that this method is a simple and effective way to prepare a large number of atoms in their vibrational ground state, and can be applied to different species of atoms and molecules for studying ultracold physics.
Article
Physics, Multidisciplinary
Amy Navarathna, James S. Bennett, Warwick P. Bowen
Summary: This study proposes a continuous protocol based on feedback cooling that operates in the unresolved sideband regime, which has significant implications for optical-to-mechanical quantum state transfer.
PHYSICAL REVIEW LETTERS
(2023)
Article
Optics
Fernanda C. Rodrigues-Machado, Pauline Pestre, Vincent Dumont, Simon Bernard, Erika Janitz, Liam Scanlon, Shirin A. Enger, Lilian Childress, Jack Sankey
Summary: We propose a simple, continuous cavity-enhanced optical absorption measurement technique based on high-bandwidth PDH sideband locking, which demonstrates its effectiveness in high sensitivity and compatibility with weak probe beams.
Article
Physics, Multidisciplinary
Shuo Zhang, Jian-Qi Zhang, Wei Wu, Wan-Su Bao, Chu Guo
Summary: The paper discusses cooling schemes in the strong sideband coupling (SSC) regime, deriving analytic expressions for the cooling rate and the average occupation of the motional steady state. Numerical simulations demonstrate that the analytic expressions accurately recover the exact dynamics in the SSC regime.
NEW JOURNAL OF PHYSICS
(2021)
Article
Optics
A. J. Rasmusson, Marissa D'Onofrio, Yuanheng Xie, Jiafeng Cui, Philip Richerme
Summary: A framework for calculating the fastest possible pulsed sideband cooling sequence was introduced and its improvement compared to traditional methods was verified. The ion's motional distribution was found to be distinctly nonthermal after cooling, making standard thermometry techniques unusable.
Article
Engineering, Chemical
Kazuta Sugita, Joi Unno, Izumi Hirasawa
Summary: The dispersion of batch time in internally seeded cooling crystallization with direct nucleation control (DNC) was estimated through computer simulation. The study developed a simulation in MATLAB by digitizing a population balance equation for numerical calculation, and repetitive simulations considering stochastic nucleation with DNC were performed. It was found that there is little batch time dispersion in crystallization controlled by DNC and without adding seed.
CHEMICAL ENGINEERING & TECHNOLOGY
(2023)
Article
Physics, Multidisciplinary
Nikolaus Lorenz, Lorenzo Festa, Lea-Marina Steinert, Christian Gross
Summary: Single neutral atoms trapped in optical tweezers and laser-coupled to Rydberg states provide a fast and flexible platform to generate configurable atomic arrays for quantum simulation. Raman sideband cooling can overcome limitations in experiments requiring continuous trapping, preparing the stage for Rydberg dressing in tweezer arrays.
Article
Chemistry, Multidisciplinary
Daniele Eugenio Lucchetta, Andrea Di Donato, Oriano Francescangeli, Gautam Singh, Riccardo Castagna
Summary: This paper reports on the realization of Distributed Feedback (DFB) lasing in a Photomobile Polymer (PMP) film using a high-resolution reflection grating. The grating is recorded in a holographic mixture consisting of halolakanes/acrylates and a fluorescent dye molecule, resulting in the simultaneous formation of the PMP film and covalent link to the DFB-grating area. The PMP-DFB system allows for optically pumped lasing action and spatial readdressing of the DFB-laser emission under low-power light irradiation.
Article
Physics, Multidisciplinary
Jin-Qi Wang, Ang Zhang, Cong-Cong Tian, Ni Yin, Qiang Zhu, Bing Wang, Zhuan-Xian Xiong, Ling-Xiang He, Bao-Long Lv
Summary: In this work, detailed experimental research on pulsed Raman sideband cooling in a Yb-171 optical lattice clock is conducted. The study successfully demonstrates the cooling of atoms to the motional ground state, which is crucial for improving the performance of Yb lattice clocks.
Article
Optics
Sooyoung Park, Meung Ho Seo, Ryun Ah Kim, D. Cho
Summary: The experiment demonstrates the effectiveness of motion-selective coherent population trapping (MSCPT) in enhancing Raman sideband cooling for 87Rb atoms. By utilizing a ? configuration, the method allows selective coherent population trapping of the low-lying motional states.
Article
Chemistry, Multidisciplinary
Chen Stern, Avraham Twitto, Rifael Z. Snitkoff, Yafit Fleger, Sabyasachi Saha, Loukya Boddapati, Akash Jain, Mengjing Wang, Kristie J. Koski, Francis Leonard Deepak, Ashwin Ramasubramaniam, Doron Naveh
Summary: Intercalation of layered compounds offers new routes for tuning material properties, as demonstrated with the Cu-MoS2 hybrid. This hybrid exhibits unique semiconducting properties and enhanced optoelectronic activity, showing promise for advanced multicolor night vision technology.
ADVANCED MATERIALS
(2021)
Article
Physics, Multidisciplinary
Manuel Crespo-Ballesteros, Misha Sumetsky
Summary: The researchers have designed a miniature device that can control the transport of light by launching whispering gallery solitons into an optical fiber. The solitons slowly propagate along the fiber and load/unload optical pulses at designated locations. The speed and direction of the solitons are controlled by minuscule variations in the effective fiber radius.
PHYSICAL REVIEW LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Zhichao Ma, Hyungmok Joh, Donglei Emma Fan, Peer Fischer
Summary: This research introduces a dynamic method of acoustic wavefront control based on light patterns that trigger the generation of microbubbles. The method allows for the modification of acoustic waves from a single transducer, enabling the generation of various acoustic images and patterns. This versatile approach has significant potential for a wide range of applications.
Article
Optics
Paolo Piergentili, Riccardo Natali, David Vitali, Giovanni Di Giuseppe
Summary: This paper reviews the linear and non-linear dynamics of an optomechanical system consisting of a two-membrane etalon and a high-finesse Fabry-Perot cavity. This system has the potential to modify the single-photon optomechanical coupling and cool two mechanical oscillators simultaneously. It is a promising platform for realizing cavity optomechanics with multiple resonators. In the non-linear regime, an analytical approach based on slowly varying amplitude equations allows for a truthful detection of membrane displacements beyond the linear sensing limits imposed by the cavity linewidth. Additionally, the system exhibits a pre-synchronization regime.
Article
Physics, Applied
F. Bemani, O. Cernotik, L. Ruppert, D. Vitali, R. Filip
Summary: The paper introduces a new type of near-resonant narrow-band force sensor with extremely low optically added noise using a feedback-controlled optical loop. In the optimal low-noise regime, the system is analogous to an optomechanical system containing a near quantum-limited optical parametric amplifier coupled to an engineered reservoir interacting with the cavity.
PHYSICAL REVIEW APPLIED
(2022)
Article
Quantum Science & Technology
Mehri Sadat Ebrahimi, Stefano Zippilli, David Vitali
Summary: This article introduces a simple feedback scheme that allows efficient operation of a microwave-quantum-illumination device based on electro-optomechanical systems, even in regimes with excessive dissipation, surpassing the optimal classical illumination protocol with the same transmitted energy.
QUANTUM SCIENCE AND TECHNOLOGY
(2022)
Article
Optics
Sampo A. Saarinen, Nenad Kralj, Eric C. Langman, Yeghishe Tsaturyan, Albert Schliesser
Summary: Many protocols in quantum science and technology require initializing a system in a pure quantum state. In this study, we laser-cool an ultracoherent, soft-clamped mechanical resonator close to the quantum ground state directly from room temperature, eliminating the need for cryogenic cooling. We introduce a powerful combination of coherent and measurement-based quantum control techniques to mitigate thermal intermodulation noise and achieve a low occupancy of 30 phonons.
News Item
Optics
Giovanni Di Giuseppe, David Vitali
Article
Quantum Science & Technology
Simone Cantori, David Vitali, Sebastiano Pilati
Summary: Predicting the output of quantum circuits is a difficult task in the development of universal quantum computers. Using classical simulations, we trained deep convolutional neural networks (CNNs) to predict output expectation values of random quantum circuits. The CNNs outperform small-scale quantum computers and demonstrate scalability, transfer learning, and noise resilience.
QUANTUM SCIENCE AND TECHNOLOGY
(2023)
Article
Quantum Science & Technology
Jacopo Angeletti, Stefano Zippilli, David Vitali
Summary: We study the dissipative stabilization of entangled states in arrays of quantum systems, focusing on qubits (spin-1/2) that may or may not interact with cavities (bosonic modes). When a cavity is lossy, we consider a squeezed reservoir and interactions that conserve cavity excitations. When a qubit is lossy, we take into account pure decay and a specially designed structure of XY interactions. We show that in the steady state, distant non-directly interacting qubit pairs can become entangled through the interplay of dissipation and local interactions.
QUANTUM SCIENCE AND TECHNOLOGY
(2023)
Article
Physics, Multidisciplinary
Michele Bonaldi, Antonio Borrielli, Giovanni Di Giuseppe, Nicola Malossi, Bruno Morana, Riccardo Natali, Paolo Piergentili, Pasqualina Maria Sarro, Enrico Serra, David Vitali
Summary: In this work, an Opto-Electro-Mechanical Modulator (OEMM) for RF-to-optical transduction is presented. This device utilizes an ultra-coherent nanomembrane resonator capacitively coupled to an rf injection circuit, improving the electro-optomechanical interaction. The device can be embedded in a Fabry-Perot cavity for electromagnetic cooling of the LC circuit, and achieved a steady-state frequency shift of 380 Hz with a polarization voltage of 30 V and a high Q-factor above 10^6 at room temperature. The use of rf-sputtered titanium nitride layer allows for efficient quantum transduction.
Article
Physics, Applied
Jacopo Angeletti, Haowei Shi, Theerthagiri Lakshmanan, David Vitali, Quntao Zhuang
Summary: Quantum entanglement is vulnerable to degradation in noisy scenarios, but the quantum illumination protocol has shown that its advantage can still be maintained. Designing a measurement system to realize this advantage is challenging due to information hidden in weak correlations and noise. Recent progress in a correlation-to-displacement conversion module provides a potential solution for practical microwave quantum illumination. This study extends the conversion module to accommodate experimental imperfections and proposes signal amplification to mitigate loss, paving the way for the development of practical microwave quantum illumination systems.
PHYSICAL REVIEW APPLIED
(2023)
Article
Physics, Multidisciplinary
Francesco Marzioni, Francesco Rasponi, Paolo Piergentili, Riccardo Natali, Giovanni Di Giuseppe, David Vitali
Summary: This paper explores the quantum effects on macroscopic objects and the applications of quantum technology in the field of cavity optomechanics. A precise control of laser noise is necessary for operating the system under extreme conditions to achieve the quantum regime. The authors experimentally add artificial noise to the laser, calibrate its intensity, inject it into the system, and verify the accuracy of the theoretical model. This procedure accurately describes the effects of a noisy laser in the optomechanical setup and allows for quantifying the amount of noise.
FRONTIERS IN PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Juuso Manninen, Mohammad Tasnimul Haque, David Vitali, Pertti Hakonen
Summary: This article proposes a scheme to enhance the optomechanical coupling between microwave and mechanical resonators and describes the specific experimental setup and operation. By adjusting certain parameters, different coupling effects can be achieved, thereby expanding the application range of optomechanical coupling technology.
Article
Instruments & Instrumentation
S. Coli, M. Angeletti, C. Gargiulo, R. Iuppa, E. Serra
Summary: The Limadou collaboration is a project involving Italian scientists working on the CSES (China Seismo-Electromagnetic Satellite) project, which aims to study the correlation between ionosphere perturbations and seismic events. The collaboration is currently developing a high-energy particle detector for the CSES-02 satellite, which will be capable of detecting trapped electrons and protons in Earth's magnetosphere. The particle detector is based on the ALPIDE technology, which offers superior performance in pixel detection.
JOURNAL OF INSTRUMENTATION
(2022)
