Article
Optics
Pengyu Wen, Xuan Mao, Min Wang, Chuan Wang, Gui-Qin Li, Gui-Lu Long
Summary: We propose a universal and scalable method to break the dark mode effect in optomechanical systems by introducing cross-Kerr nonlinearity. Multiple stable steady states can be achieved in our scheme, providing optimal parameters for cooling.
Article
Optics
Qizhi Cai, Boyu Fan, Yunru Fan, Guangwei Deng, You Wang, Haizhi Song, Guangcan Guo, Qiang Zhou
Summary: In this work, a scheme for generating steady-state entanglement between optical and mechanical cavity modes in an optomechanical crystal nanobeam is proposed. Through finite element simulation and the quantum Langevin equation, the authors explore the evolution of entanglement under different optomechanical properties and demonstrate the ability to achieve optimal entanglement generation with both blue and red-detuned optical pumps. The intrinsic relationship between optomechanical cooperativity and entanglement is further clarified, providing a clear physical picture of the optomechanical interaction. This work expands the understanding of macroscopic quantum mechanics and is an important step towards developing novel quantum optomechanical devices.
Article
Optics
Yupeng Chen, Sumei Huang, Li Deng, Aixi Chen
Summary: In this study, it is shown that placing a degenerate optical parametric amplifier (OPA) inside the macroscopic Laguerre-Gaussian (L-G) cavity optorotating system can enhance the steady-state entanglement between the two cavity modes. The influences of the nonlinear gain and phase of the OPA, the temperature of the environment, and the angular momentums of the two cavity modes on the entanglement between the two cavity modes are studied.
Article
Mathematics
Peipei Pan, Aixi Chen, Li Deng
Summary: We investigate the cooling phenomenon of a mechanical oscillator in a double-coupled cavity optomechanical system. Our results show that the cooling of the mechanical oscillator can be significantly improved in the presence of optical parameter amplification and adjustment of optical cavity parameters. Our cooling solutions have potential applications for the preparation of nonclassical states of mechanical oscillators, high-precision measurements, and quantum information processing.
Article
Physics, Multidisciplinary
A. Kani, B. Sarma, J. Twamley
Summary: We have demonstrated the microwave cavity-magnomechanical center-of-mass cooling of a levitated magnetic sphere, in which the standing magnetic component of the electromagnetic wave within a microwave cavity exerts a dynamical force on the sphere and dissipates mechanical energy through scattering into the magnon mode. This coupling is independent of the mass and size of the sphere, making it an important method for testing quantum mechanics with macroscopic objects.
PHYSICAL REVIEW LETTERS
(2022)
Article
Optics
Bo Gao, Jun Li, Hanwen Jiang, Jianshan Wang, Chengjie Zhu, Jingping Xu, Yaping Yang
Summary: In this study, the dynamics of two quantum dots in a finite coupled-cavity arrays system with different edge modes were explored by combining topological photonics and quantum optics. Depending on the number of cavities, the system exhibits two different phenomena: either the edge modes cancel each other out or the two quantum dots can be connected. In systems with a small number of cavities, energy transfer between the quantum dots can be achieved through edge modes.
Article
Optics
Zhen Yang, Junya Yang, Shi-Lei Chao, Chengsong Zhao, Rui Peng, Ling Zhou
Summary: A scheme for simultaneously cooling multiple identical mechanical oscillators is proposed, where the frequency of one oscillator is designed using Lyapunov control. By effectively coupling the dark mode with the bright mode, the two identical oscillators can be simultaneously cooled to their ground state. This scheme can also be extended to achieve simultaneous cooling of multiple identical mechanical oscillators.
Article
Optics
Jin-Yu Liu, Wenjing Liu, Da Xu, Jia-Chen Shi, Haitan Xu, Qihuang Gong, Yun-Feng Xiao
Summary: A general approach to achieve ground-state cooling of an arbitrary number of mechanical modes is proposed, overcoming the limit imposed by the formation of mechanical dark modes. Multiple optical modes are employed to prevent destructive interference of the cooling pathway, eliminating the dark modes. The feasibility and scalability of the proposed scheme are demonstrated in a realistic multimode optomechanical system.
Article
Optics
Bakht Hussain, Shahid Qamar, Muhammad Irfan
Summary: This study proposes a method to enhance entanglement in cavity magnomechanics using an optical parametric amplifier (OPA). Experimental results show that this method effectively enhances both bipartite and tripartite entanglement, and improves the robustness of entanglement against temperature.
Article
Quantum Science & Technology
Amjad Sohail, Ali Hassan, Rizwan Ahmed, Chang-shui Yu
Summary: This study investigates a theoretical scheme to improve the entanglement of directly and indirectly coupled modes in a magnomechanical system. By utilizing the magnetic dipole and magnetostrictive interactions, the microwave cavity mode and mechanical mode are entangled with the magnon mode, leading to an enhanced entanglement spectrum. The study also shows that this entanglement persists at higher temperatures.
QUANTUM INFORMATION PROCESSING
(2022)
Article
Quantum Science & Technology
Jie Li, Simon Groeblacher
Summary: In this study, a scheme is proposed to entangle the vibrational phonon modes of two massive ferromagnetic spheres in a dual-cavity magnomechanical system. By directly driving the magnon mode with a red-detuned microwave field, a cavity-magnon-phonon state-swap interaction can be realized, leading to the remote entanglement of the two ferromagnetic spheres. This work demonstrates that cavity magnomechanical systems enable the preparation of quantum entangled states at a larger scale than currently possible with other schemes.
QUANTUM SCIENCE AND TECHNOLOGY
(2021)
Article
Instruments & Instrumentation
Oliver Wipfli, Henry Fernandes Passagem, Christoph Fischer, Matt Grau, Jonathan P. Home
Summary: This paper reports the realization of a hemispherical optical cavity that has a finesse of F = 13,000 and can sustain inter-cavity powers of 10 kW. The cavity was designed with an integrated radio-frequency Paul trap to combine optical and radio-frequency trapping. The system's design and operation, including low-vibration mounting, locking, and thermal effects at high powers are described. Observations made over a year show a repeatable shift between the ion trap center and the cavity mode.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2023)
Article
Physics, Multidisciplinary
Johannes Piotrowski, Dominik Windey, Jayadev Vijayan, Carlos Gonzalez-Ballestero, Andres de los Rios Sommer, Nadine Meyer, Romain Quidant, Oriol Romero-Isart, Rene Reimann, Lukas Novotny
Summary: Researchers have successfully cooled a levitated nanoparticle in an optical cavity to its motional ground state in two degrees of freedom simultaneously. Control of the cavity properties also allowed for the observation of the transition from 1D to 2D ground-state cooling. This achievement is important for investigating macroscopic quantum states and building high fidelity sensors.
Article
Optics
Ji-Xin Li, C. H. Raymond Ooi, Qiong Wang, Sheng-Li Chang
Summary: Coupled mechanical resonators have received significant attention for their practical applications and fundamental studies. In order to prepare them, it is necessary to cool the resonators to their ground states. In this study, we propose a theoretical scheme to achieve ground-state cooling of two coupled mechanical resonators by utilizing an optomechanical interface. Our calculations demonstrate that ground-state cooling can be achieved in the resolved-sideband regime and under optimal driving. Furthermore, we analytically derived the cooling limits by adiabatically eliminating the cavity field under the large-decay limit.
Article
Materials Science, Multidisciplinary
M. Taeno, D. Maestre, A. Cremades
Summary: Fabry-Perot resonant modes have been detected and analyzed in NiO microcrystals in the visible range. The unique geometry and morphology of well-faceted NiO microstructures favor light confinement and optical resonances, with estimated quality and finesse factors of 207 and 1.8, respectively, and a refractive index of n = 2.3 +/- 0.2. Achieving optical modulations in NiO microstructures could enhance the functionality and applicability of this oxide in optical devices, a field that has not been fully explored yet.
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
Optics
Nico S. Bassler, Michael Reitz, Kai Phillip Schmidt, Claudiu Genes
Summary: We discuss the use of two-dimensional subwavelength quantum emitter arrays as efficient optical elements in the linear regime. The cooperative optical response resulting from emitter-emitter dipole exchanges allows control over transmission, resonance frequency, and bandwidth. By adjusting the array geometry and external magnetic field, various operations on fully polarized incident light can be achieved, such as linear and circular polarizers, as well as phase retarders.
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
Optics
Alekhya Ghosh, Pardeep Kumar, Christian Sommer, Fidel G. Jimenez, Vivishek Sudhir, Claudiu Genes
Summary: We propose an adaptive phase technique for parametric cooling of mechanical oscillators. This technique requires periodic adjustments of the phase of a parametric modulation based on measurements of the mechanical oscillator's two quadratures. The scheme shows exponential loss of thermal energy at high initial occupancies, similar to cold-damping or cavity self-cooling techniques. As the system approaches the quantum ground state, the phase adaptive scheme leads to residual occupancies at the level of a few phonons due to competition between parametric amplification and feedback action.
Article
Optics
H. Allahverdi, Ali Motazedifard, A. Dalafi, D. Vitali, M. H. Naderi
Summary: The proposed scheme in this paper enhances force detection sensitivity in a hybrid optomechanical setup beyond the standard quantum limit (SQL) by using squeezed vacuum injection. The combination of CQNC strategy with variational homodyne detection improves noise cancellation and signal response amplification, leading to remarkable force sensitivity.
Article
Physics, Multidisciplinary
R. Holzinger, S. A. Oh, M. Reitz, H. Ritsch, C. Genes
Summary: This study provides analytical and numerical results on the modification of super- and subradiance in molecular emitters, taking into account the excitation of vibrational degrees of freedom. It reveals that molecular rings can be operated as platforms for the preparation of long-lived dark superposition states aided by vibrational relaxation.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Optics
Najmeh Eshaqi-Sani, Stefano Zippilli, David Vitali
Summary: This article introduces a scheme for nonreciprocal conversion between optical and radio-frequency photons using exclusively optomechanical and electromechanical interactions. The nonreciprocal transmission is obtained through interference of two dissipative transmission pathways established between two intermediate mechanical modes.
Proceedings Paper
Engineering, Electrical & Electronic
P. Livreri, E. Enrico, L. Fasolo, A. Greco, A. Rettaroli, D. Vitali, A. Farina, Com F. Marchetti, A. Sq D. Giacomin
Summary: A microwave quantum radar setup based on quantum illumination protocol and utilizing JTWPA is proposed in this paper. The experimental results demonstrate the capability of JTWPA to generate and control three-wave mixing modes, making our MQI system a promising candidate for the detection of stealth objects.
2022 IEEE RADAR CONFERENCE (RADARCONF'22)
(2022)
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.