Article
Chemistry, Multidisciplinary
Guoqing Wang, Yi-Xiang Liu, Yuan Zhu, Paola Cappellaro
Summary: A protocol utilizing a single NV is proposed to reconstruct the vectorial components of an AC magnetic field, achieving high sensitivity and spatial resolution, with broad applications in condensed matter physics.
Article
Optics
Wu-Zhen Li, Chen Yang, Zhi-Yuan Zhou, Yan Li, Yin-Hai Li, Su-Jian Niu, Zheng Ge, Li Chen, Guang-Can Guo, Bao-Sen Shi
Summary: In this study, a phase amplifier scheme is proposed and experimentally demonstrated, which amplifies the relative phase difference between two polarization modes in a polarized interferometer using a harmonic generation process. The amplification processes can be recycled, allowing for more multiple amplification steps. Compared to methods based on NOON states, the presented phase amplification method has considerable advantages and holds great promise for precision optical measurements.
LIGHT-SCIENCE & APPLICATIONS
(2022)
Article
Physics, Multidisciplinary
Marcos V. S. de Paula, William W. T. Sinesio, Alexandre V. Dodonov
Summary: We propose a scheme for generating photons from vacuum through time-modulation of a quantum system indirectly coupled to the cavity field. By applying modulation to an artificial two-level atom (t-qubit) which can be located outside the cavity, while coupling a stationary qubit (ancilla) to both the cavity and t-qubit via dipole interaction, we can generate tripartite entangled states with few photons from the ground state of the system under resonant modulations, even with large detuning between t-qubit, ancilla, and cavity, as long as their frequencies are properly adjusted. We validate our approximate analytic results with numeric simulations and show that photon generation from vacuum persists in the presence of common dissipation mechanisms.
Article
Engineering, Electrical & Electronic
Lucas de Araujo Pereira, Adrien Morel, Mustapha Touhami, Theo Lamorelle, Ghislain Despesse, Gael Pillonnet
Summary: This letter presents an experimentally validated model to accurately predict the operating frequency, the switching angles, and the piezoelectric current for any six-phase piezoelectric dc-dc converter. This model reduces the transient simulation's calculation time to reach the steady state and can be used to initially setup the switching angles in the experiment or predict the high-frequency spectrum generated by the converter cycle.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Optics
Hai-Tao Tu, Kai-Yu Liao, Zuan-Xian Zhang, Xiao-Hong Liu, Shun-Yuan Zheng, Shu-Zhe Yang, Xin-Ding Zhang, Hui Yan, Shi-Liang Zhu
Summary: High-resolution quantum-dot LEDs demonstrated using transfer printing could be beneficial for next-generation displays. Coherent microwave-to-optics transduction is achieved using Rydberg atoms and off-resonant scattering technique, with high efficiency and wide bandwidth.
Article
Automation & Control Systems
Abraham Marquez Alcaide, Sandro Guenter, Jose I. Leon, Giampaolo Buticchi, Samir Kouro, Leopoldo Garcia Franquelo
Summary: The global shift towards electrified transportation has increased the demand for electric vehicles. To facilitate this transition, fast and ultrafast charging substations are needed. Power converters are crucial for the widespread adoption of electric vehicles, but their reliability and maintenance scheduling are becoming significant concerns. As a result, optimizing the operation of interleaved dc/dc converters in charging poles is important. This article proposes an alternative modulation technique to improve the harmonic performance of the common dc-link capacitor current, extending the capacitor's lifetime. Experimental results validate the effectiveness of the proposed method.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Automation & Control Systems
Jianxin Zhu, Hongfei Wu, Jiajie Huang, Ming Hua, Lin Li, Yan Xing
Summary: This paper proposes a dual-dc output three-phase three-level ac-dc converter for low-frequency pulsed power decoupling applications. By using a power decoupling port and decoupling capacitor, high-power quality and efficient power decoupling are achieved with reduced power conversion stages.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2022)
Article
Optics
Zi-Mo Cheng, Shu-Tian Xue, Yan-Chao Lou, Pei Wan, Zhi-Cheng Ren, Jianping Ding, Xi-Lin Wang, Hui-Tian Wang
Summary: Rotational Doppler effect is a phenomenon that occurs when light passes through a rotating object and its angular momentum changes. It has been studied extensively in linear optics, but its application in nonlinear optics remains to be explored.
Article
Materials Science, Multidisciplinary
Junzhe Zhu, Zhenpeng Guo, Yufan Zhou, Xiucheng Zou, Ye Zhu, Yu Liu, Ren Liu
Summary: Light-driven 3D printing allows for more creative freedom and concrete realization of original creations in various conditions with options for resolution and properties. By optimizing the chemistry, rapid direct ink writing is achieved by utilizing up-conversion assisted photopolymerization. This strategy accelerates the polymerization process by maximizing the active species generated during limited irradiation. High print speed and shorter manufacturing time are achieved through multi-resolution printing, making this technique compatible with both rigid and elastomeric materials.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Automation & Control Systems
Hadi Tarzamni, Pouya Kolahian, Mehran Sabahi
Summary: This article introduces a new high step-up dc-dc converter based on a coupled inductor, which features high output voltage gains, lower switch losses, shared output voltage from two ports, and absence of circulating current. The proposed converter is analyzed, compared, and experimentally validated in terms of its performance.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Ziheng Liu, Zenglong Zhao, Yan Kai, Yunhong Lao, Jinyan Wang, Fanyi Meng
Summary: This article presents the frequency-domain-based modified impedance tuning analysis method and its application in the design of a class-Phi(2) dc-dc converter. By adjusting the second-order harmonic voltage, the goal of reducing voltage stresses across the main power devices is achieved. This method enables load-independent zero voltage switching characteristics.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Koteswara Rao Kothapalli, Manoj R. Ramteke, Hiralal Murlidhar Suryawanshi
Summary: A soft-switched isolated bidirectional dc-dc converter is proposed for distributed generation systems. The converter consists of a dual coupled inductor-based flyback energy conversion circuit, an active switch-based capacitor multiplier cell, and an active-voltage-clamping type circuit. The proposed converter achieves high efficiency and voltage step-up/down ratio, reduces voltage stresses, and achieves zero-voltage and zero-current switching. A laboratory-built set-up verifies the viability of the design concept, with measured peak efficiencies of 96.65% and 96.58% in boost and buck stages, respectively.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Automation & Control Systems
Alba Rodriguez-Lorente, Andres Barrado, Carlos Calderon, Antonio Lazaro, Pablo Zumel
Summary: This article presents a new nonisolated bidirectional dc-dc converter with noninverting output and buck-boost operation, allowing for soft switching and minimization of conduction losses for any load and voltage requirement using triple-phase shift modulation. The feasibility of the MCB3 converter is validated by comparing simulation-level results to experimental measurements for a 460-W-scaled prototype, showcasing its potential for various voltage and power ranges.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Mohammad Mousavi, Younes Sangsefidi, Ali Mehrizi-Sani
Summary: The article proposes a high-efficiency resonant switched capacitor converter and control algorithm, achieving zero-voltage switching and zero-current switching under different operating conditions, and validates the feasibility of the proposed methods through simulation and experimentation.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2021)
Article
Automation & Control Systems
Seok-Kyoon Kim, Choon Ki Ahn
Summary: A robust output voltage-tracking algorithm based on a variable invariant manifold was proposed in this paper. The method automatically adjusts the invariant manifold and introduces nonlinear disturbance observers to improve the transient output voltage-tracking performance. The proposed technique was confirmed experimentally with a 3-kW dc/dc boost power conversion system.
IEEE TRANSACTIONS ON SYSTEMS MAN CYBERNETICS-SYSTEMS
(2021)
Article
Chemistry, Multidisciplinary
Changhao Li, Rouhollah Soleyman, Mohammad Kohandel, Paola Cappellaro
Summary: A molecular transducer based on NV centers has been proposed to convert SARS-CoV-2 RNA into magnetic noise signal for optical readout. This sensor demonstrates high sensitivity, low false negative rate, and fast detection of the virus.
Article
Physics, Multidisciplinary
Ivan Rojkov, David Layden, Paola Cappellaro, Jonathan Home, Florentin Reiter
Summary: The sensitivity of quantum sensors is limited by decoherence. Quantum error correction (QEC) can enhance sensitivity by suppressing decoherence but causes a bias in the sensor's output in realistic settings. Failure to account for this bias can systematically reduce the sensor's performance in experiments and provide misleading values for the minimum detectable signal in theory. The analysis focuses on the experimentally motivated setting of continuous-time QEC, demonstrating how to address and mitigate this effect and highlighting potential incorrect results.
PHYSICAL REVIEW LETTERS
(2022)
Article
Multidisciplinary Sciences
Mo Chen, Changhao Li, Giandomenico Palumbo, Yan-Qing Zhu, Nathan Goldman, Paola Cappellaro
Summary: This study reports the synthesis of a tensor monopole in a single solid-state defect in diamond, characterizing its properties through quantized topological charge and Kalb-Ramond field measurements. Introducing an external field that breaks chiral symmetry led to an intriguing spectral transition with spectral rings protected by mirror symmetries. The work demonstrates the possibility of emulating exotic topological structures inspired by string theory.
Article
Physics, Multidisciplinary
Guoqing Wang, Yi-Xiang Liu, Jennifer M. Schloss, Scott T. Alsid, Danielle A. Braje, Paola Cappellaro
Summary: This study develops a technique for sensing arbitrary-frequency signals using quantum sensors as quantum frequency mixers, enabling a variety of sensing applications.
Article
Physics, Applied
Pai Peng, Xiaoyang Huang, Chao Yin, Linta Joseph, Chandrasekhar Ramanathan, Paola Cappellaro
Summary: This paper uses deep reinforcement learning techniques to search for Hamiltonian engineering sequences in quantum many-body systems and experimentally demonstrates their superiority. By training DRL agents and considering experimental imperfections, robust output sequences are obtained. In addition, the paper also discovers a common pattern with a meaningful analytical description that was previously unknown, and restricts the search space based on this control pattern to obtain long sequences that are robust against experimental imperfections.
PHYSICAL REVIEW APPLIED
(2022)
Article
Multidisciplinary Sciences
Ozgur Sahin, Erica de Leon Sanchez, Sophie Conti, Amala Akkiraju, Paul Reshetikhin, Emanuel Druga, Aakriti Aggarwal, Benjamin Gilbert, Sunil Bhave, Ashok Ajoy
Summary: This study demonstrates a high-field spin magnetometer constructed from hyperpolarized C-13 nuclear spins, achieving high-resolution quantum sensing through the detection of its secondary precession. This work anticipates new opportunities for constructing microscale NMR chemical sensors using hyperpolarized nanodiamonds and suggests applications of dynamic nuclear polarization in quantum sensing.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Applied
Adrisha Sarkar, Brian Blankenship, Emanuel Druga, Arjun Pillai, Ruhee Nirodi, Siddharth Singh, Alexander Oddo, Paul Reshetikhin, Ashok Ajoy
Summary: This study reports a strategy to increase the spin injection rate by utilizing high-power optical pumping to rapidly polarize electrons. Experiments conducted in a model system in diamond demonstrate successful enhancement of the spin-injection rates through a spin-ratchet polarization transfer mechanism. The findings elucidate bottlenecks in the dynamic nuclear polarization process and show potential for rapid spin injection using nonthermally generated electron polarization.
PHYSICAL REVIEW APPLIED
(2022)
Article
Physics, Multidisciplinary
William Beatrez, Christoph Fleckenstein, Arjun Pillai, Erica de Leon Sanchez, Amala Akkiraju, Jesus Diaz Alcala, Sophie Conti, Paul Reshetikhin, Emanuel Druga, Marin Bukov, Ashok Ajoy
Summary: Discrete time crystals are non-equilibrium many-body phases of matter characterized by spontaneously broken discrete time-translation symmetry under periodic driving. At sufficiently high driving frequencies, the system enters the Floquet prethermalization regime, in which the periodically driven many-body state has a lifetime vastly exceeding the intrinsic decay time of the system. Here, we report the observation of long-lived prethermal discrete time-crystalline order in a three-dimensional (3D) lattice of 13C nuclei in diamond at room temperature.
Article
Physics, Multidisciplinary
Guoqing Wang, Ariel Rebekah Barr, Hao Tang, Mo Chen, Changhao Li, Haowei Xu, Andrew Stasiuk, Ju Li, Paola Cappellaro
Summary: Solid-state spin defects, specifically nuclear spins with long coherence times, are potential candidates for quantum memories and sensors. However, their current performance is limited by dephasing caused by variations in their intrinsic interactions. A proposed unbalanced echo technique can overcome this challenge and preserve quantum information.
PHYSICAL REVIEW LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Nicholas Nunn, Sergey Milikisiyants, Marco D. Torelli, Richard Monge, Tom Delord, Alexander I. Shames, Carlos A. Meriles, Ashok Ajoy, Alex I. Smirnov, Olga A. Shenderova
Summary: High-temperature annealing is a promising method to enhance spin properties of NV centers in diamond particles. We investigated the effects of conventional annealing and high-temperature annealing on particles of different sizes. The results show that prolonged annealing at 1600 degrees C increases NV spin relaxation times and fluorescence contrast, while decreasing the content of NV centers in the particles.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B
(2023)
Article
Physics, Multidisciplinary
William Beatrez, Arjun Pillai, Otto Janes, Dieter Suter, Ashok Ajoy
Summary: We report on experiments that quantify the role of a central electronic spin as a relaxation source for nuclear spins in its nanoscale environment. Our strategy exploits hyperpolarization injection from the electron as a means to controllably probe an increasing number of nuclear spins in the bath and subsequently interrogate them with high fidelity. These results suggest interesting new means to spatially discriminate nuclear spins in a nanoscale environment and have direct relevance to dynamic nuclear polarization and quantum sensors and memories constructed from hyperpolarized nuclei.
PHYSICAL REVIEW LETTERS
(2023)
Article
Optics
Haowei Xu, Hao Tang, Guoqing Wang, Changhao Li, Boning Li, Paola Cappellaro, Ju Li
Summary: In this work, an efficient two-photon pumping scheme utilizing the optonuclear quadrupolar effect is proposed to excite the isomeric state of 229Th. The study demonstrates the possibility of achieving population inversion between the nuclear isomeric and ground states, which opens up a new path towards the realization of nuclear lasers.
Proceedings Paper
Computer Science, Theory & Methods
Santiago Hernandez-Gomez, Federico Balducci, Paola Cappellaro, Antonello Scardicchio, Nicole Fabbri
Summary: This article presents a quantum optimal control method to optimize the sensitivity of an NV sensor to specific weak magnetic signals. The method allows for a three orders of magnitude improvement in sensitivity and is applicable to biological research such as nano-MRI.
PROCEEDINGS OF 2022 IEEE INTERNATIONAL WORKSHOP ON METROLOGY FOR INDUSTRY 4.0 & IOT (IEEE METROIND4.0&IOT)
(2022)
Article
Quantum Science & Technology
S. Hernandez-Gomez, S. Gherardini, N. Staudenmaier, F. Poggiali, M. Campisi, A. Trombettoni, F. S. Cataliotti, P. Cappellaro, N. Fabbri
Summary: Engineered dynamical maps have shown technological applications and potential in quantum thermodynamic processes. In this study, we experimentally realized an autonomous feedback process with tunable dissipative strength by controlling the nitrogen-vacancy center. The efficacy of the feedback process was quantified using a generalized Sagawa-Ueda-Tasaki relation for dissipative dynamics.
Article
Materials Science, Multidisciplinary
Daniela Pagliero, Pablo R. Zangara, Jacob Henshaw, Ashok Ajoy, Rodolfo H. Acosta, Neil Manson, Jeffrey A. Reimer, Alexander Pines, Carlos A. Meriles
Summary: In this study, magnetic-field-dependent activation of nuclear spin transport from strongly hyperfine-coupled C-13 sites in diamond was demonstrated using field-cycling-assisted dynamic nuclear polarization and continuous radio-frequency driving over a broad spectral range. The findings were interpreted using a theoretical framework where nuclear spin interactions are mediated by electron spins, and localized nuclear spins must thermalize when in contact with a larger ancilla spin network. Additionally, stark changes in the RF-absorption spectrum were observed by probing the system response to a variable driving field amplitude, partly attributed to contributions from heterogeneous multispin sets with zero-quantum transitions becoming RF active thanks to the hybrid electron-nuclear nature of the system.