Review
Quantum Science & Technology
Zheshen Zhang, Quntao Zhuang
Summary: A collective measurement taken by multiple independent sensors can improve sensitivity, and leveraging quantum resources can surpass the standard quantum limit. Distributed quantum sensing utilizes entangled states shared by multiple sensors to enhance performance in tackling different measurement problems.
QUANTUM SCIENCE AND TECHNOLOGY
(2021)
Article
Physics, Multidisciplinary
Victor Montenegro, Utkarsh Mishra, Abolfazl Bayat
Summary: This study provides a systematic approach for quantifying the precision of a probe in multiparameter global sensing without prior information about the parameters. In single-parameter sensing, optimizing the control field allows the probe to operate around its criticality. For multiparameter cases, optimizing the control fields enables the probe to operate at the most efficient point along its critical line.
PHYSICAL REVIEW LETTERS
(2021)
Article
Quantum Science & Technology
Hongtao Huo, Min Zhuang, Jiahao Huang, Chaohong Lee
Summary: This study proposes a method to concurrently generate entanglement and perform sensing within a limited coherence time, and finds the optimal control sequences through machine optimization. By optimizing the number of particles and time-modulated rotations along two different axes, Heisenberg-limited precision scaling can be achieved.
QUANTUM SCIENCE AND TECHNOLOGY
(2022)
Article
Quantum Science & Technology
Xuanhua Wang, Jin Wang
Summary: In this study, quantum master equations beyond secular approximation are used to study the nonequilibrium thermodynamic cost of enhanced quantum metrology and quantum correlations. It is found that nonequilibrium conditions enhance quantum Fisher information and quantum correlations predominantly for weak tunneling scenarios. However, in the strong tunneling regimes, the quantum Fisher information and quantum correlations cannot be continuously boosted by higher thermodynamic costs and decay once the system is overburdened with extremely large energy currents.
QUANTUM INFORMATION PROCESSING
(2022)
Article
Physics, Multidisciplinary
Arunava Majumder, Harshank Shrotriya, Leong-Chuan Kwek
Summary: Quantum metrology is important in overcoming standard precision limits, with the Heisenberg uncertainty principle imposing constraints on measurement precision. Quantum strategies such as squeezing and entanglement can surpass conventional bounds like the shot noise limit. The concept of bipartite entangled quantum states with a positive partial transpose and bound entangled states are discussed, highlighting their differences in quantum state properties.
Article
Multidisciplinary Sciences
Benjamin Yadin, Matteo Fadel, Manuel Gessner
Summary: The EPR paradox is a fundamental concept in quantum mechanics that can be applied to enhance precision measurements through the concept of steering, which involves predicting measurement results on one side of a quantum-correlated system based on measurements on the other side. The authors propose a new general criterion for detecting steering based on quantum Fisher information, expanding the understanding of steering in state-of-the-art experiments.
NATURE COMMUNICATIONS
(2021)
Article
Quantum Science & Technology
Arne Hamann, Pavel Sekatski, Wolfgang Duer
Summary: This paper investigates the sensing of scalar valued fields with specific spatial dependence using a network of sensors. By constructing a decoherence-free subspace, the specific signal can be accurately sensed while being insensitive to other signals at different positions or with unequal spatial dependence. The concept of an approximate decoherence-free subspace is introduced to suppress noise while controlling the signal strength. An efficient formalism is introduced to construct internal states and sensor configurations, and several examples are analyzed and applied to demonstrate the usefulness and wide applicability of the approach.
QUANTUM SCIENCE AND TECHNOLOGY
(2022)
Article
Optics
Danilo Zia, Nazanin Dehghan, Alessio D'Errico, Fabio Sciarrino, Ebrahim Karimi
Summary: Biphoton digital holography is a method that uses coincidence imaging to retrieve amplitude and phase information of an unknown biphoton state. This approach allows for a more efficient and reliable characterization of high-dimensional biphoton states. The proposed reconstruction technique achieves a three orders of magnitude faster measurement time and an average fidelity of 87% compared to previous experiments.
Article
Physics, Multidisciplinary
Yuxiang Qiu, Min Zhuang, Jiahao Huang, Chaohong Lee
Summary: This study proposes a scheme to optimize the state preparation pulse sequence for accelerating entanglement generation using deep reinforcement learning. By maximizing the quantum Fisher information, the pulse sequence can generate entangled states with ultimate precision bounds following the Heisenberg-limited scalings, and show better robustness against differences between simulation and experiment.
NEW JOURNAL OF PHYSICS
(2022)
Article
Optics
Jun Liu, Xiaoshu Zhu, Yifan Zhou, Xiujuan Zou, Zhaofu Qin, Shuming Wang, Shining Zhu, Zhenlin Wang
Summary: Based on metasurfaces, the information density and stability of the quantum imaging system can be further improved. This work demonstrates that two patterns on a high-efficiency dielectric metasurface can be remotely switched via polarization-entangled photon pairs, and the information carried by quantum light can be distinguished from background noise using the time-correlated property of entangled photon pairs. These findings highlight the potential of phase manipulation of quantum light with metasurfaces in quantum imaging, quantum state tomography, and real-world applications.
Article
Quantum Science & Technology
Uman Khalid, Junaid Ur Rehman, Hyundong Shin
Summary: This study investigates the impact of many-body effects on multipartite entanglement in quantum metrology, including interaction with noisy environment and nonlocal interactions among particles. The research found that multipartite entanglement can be disentangled in noisy environment, limiting the metrological advantage of quantum probes. Nonlocal interactions can be exploited as a valuable resource for better precision scaling.
QUANTUM SCIENCE AND TECHNOLOGY
(2021)
Article
Optics
Yusef Maleki, M. Suhail Zubairy
Summary: Quantum sensors offer novel sensing and imaging technologies beyond classical devices, enabling the use of new technologies from atomic clocks to delicate biological measurements. This paper investigates the performance of networked quantum sensors using W-type quantum states as probes, and provides a criterion for enhancing distributed phase estimations. The paper also explores schemes for generating and using entangled quantum probes in practical settings.
Article
Physics, Multidisciplinary
Fabio Benatti, Roberto Floreanini, Ugo Marzolino
Summary: The study explores the role of entanglement and non-locality in quantum protocols with identical particles systems. Second quantization formalism is found to be the only approach that avoids inconsistencies and paradoxes. Inconsistencies arise when entanglement and non-locality are forced to be properties of the identical particles rather than the modes they can occupy.
Article
Quantum Science & Technology
Carlos A. Meriles, Pablo R. Zangara, Daniela Pagliero
Summary: This study theoretically examines the coherent spin dynamics of a hetero-spin system consisting of a spin S=1 with a non-zero crystal field and a paramagnetic center S'=1/2 nearby. The analysis of the energy level structure shows that this system exhibits long-lived zero-quantum coherences separated by a magnetic-field-insensitive energy gap, which can be used for precision magnetometry. Additionally, the different responses of the spin species to electric or thermal stimuli can be utilized for alternative sensing protocols for magnetic-noise-free electrometry and thermometry.
ADVANCED QUANTUM TECHNOLOGIES
(2023)
Article
Optics
Zhifei Yu, Bo Fang, Pan Liu, Shuying Chen, Guzhi Bao, Chun-hua Yuan, Liqing Chen
Summary: This study experimentally demonstrates the mitigating effect of loss on SALHI visibility through asymmetric gain optimization, and highlights the importance of visibility as an experimental operational criterion for SNR improvement in practical applications.
Article
Multidisciplinary Sciences
Giuseppe Ortolano, Elena Losero, Stefano Pirandola, Marco Genovese, Ivano Ruo-Berchera
Summary: Through theoretical and experimental demonstrations, quantum advantage can be achieved in quantum reading by combining practical photon-counting measurements with a simple maximum-likelihood decision. Quantum entanglement and simple optics are shown to enhance the readout of digital data, paving the way for practical applications of quantum reading.
Article
Chemistry, Multidisciplinary
Enrico Rebufello, Fabrizio Piacentini, Alessio Avella, Rudi Lussana, Federica Villa, Alberto Tosi, Marco Gramegna, Giorgio Brida, Eliahu Cohen, Lev Vaidman, Ivo Pietro Degiovanni, Marco Genovese
Summary: Protective measurement is a novel protocol that combines weak interactions with a protection mechanism to preserve state coherence during the measurement process. It allows finding the expectation value of an observable without the need for statistics, potentially advancing quantum technology fields significantly.
APPLIED SCIENCES-BASEL
(2021)
Article
Physics, Multidisciplinary
Chiara Marletto, Vlatko Vedral, Laura T. Knoll, Fabrizio Piacentini, Ettore Bernardi, Enrico Rebufello, Alessio Avella, Marco Gramegna, Ivo Pietro Degiovanni, Marco Genovese
Summary: This Letter discusses the emergence of irreversibility in a universe with time-reversal symmetric laws using the constructor theory framework. It demonstrates the compatibility of irreversibility with quantum theory's time-reversal symmetric laws by studying a dynamical model based on the universal quantum homogenizer. The physical realizability of this model is also tested through an experimental demonstration using high quality single-photon qubits.
PHYSICAL REVIEW LETTERS
(2022)
Correction
Multidisciplinary Sciences
Cecilia Clivati, Alice Meda, Simone Donadello, Salvatore Virzi, Marco Genovese, Filippo Levi, Alberto Mura, Mirko Pittaluga, Zhiliang Yuan, Andrew J. Shields, Marco Lucamarini, Ivo Pietro Degiovanni, Davide Calonico
NATURE COMMUNICATIONS
(2022)
Article
Multidisciplinary Sciences
Cecilia Clivati, Alice Meda, Simone Donadello, Salvatore Virzi, Marco Genovese, Filippo Levi, Alberto Mura, Mirko Pittaluga, Zhiliang Yuan, Andrew J. Shields, Marco Lucamarini, Ivo Pietro Degiovanni, Davide Calonico
Summary: In this study, the authors use technologies from the optical clocks community to demonstrate a setup for twin-field quantum key distribution (QKD) that extends the coherence times by three orders of magnitude, overcoming the main challenge towards real-world implementation. They develop a solution using interferometry techniques to enable simultaneous key streaming and channel length control, and successfully demonstrate it on a 206 km field-deployed fiber. This technique represents an effective solution for real-world quantum communications.
NATURE COMMUNICATIONS
(2022)
Article
Multidisciplinary Sciences
Giuseppe Ortolano, Pauline Boucher, Ivo Pietro Degiovanni, Elena Losero, Marco Genovese, Ivano Ruo-Berchera
Summary: A protocol addressing the conformance test problem is introduced, showing that a simple quantum strategy can outperform any classical strategy. The experimental implementation of this protocol using optical twin beams validates the theoretical results and demonstrates a quantum advantage in a realistic setting.
Article
Chemistry, Analytical
Giuseppe Ortolano, Ivano Ruo-Berchera
Summary: This article analyzes the optimized quantum sensing protocol for enhancing the readout accuracy of optical memories in the presence of imprecise writing. The study shows that quantum entanglement technology can effectively improve the reading performance of ideal optical memories and the proposed strategy is feasible with current technology and relatively robust to detection and optical losses. Furthermore, the research has implications for pattern identification in biological systems, spectrophotometry, and optical measurements for extracting information.
Article
Physics, Multidisciplinary
Salvatore Virzi, Alessio Avella, Fabrizio Piacentini, Marco Gramegna, Tomas Opatrny, Abraham G. Kofman, Gershon Kurizki, Stefano Gherardini, Filippo Caruso, Ivo Pietro Degiovanni, Marco Genovese
Summary: For the first time, we experimentally demonstrate noise diagnostics by repeated quantum measurements, showing the ability of a single photon to diagnose non-Markovian temporal correlations of random polarization noise. We probe the photon with frequent (partially) selective polarization measurements to diagnose both the noise spectrum and temporal correlations. Positive temporal correlations correspond to a regime enabled by the quantum Zeno effect (QZE), while negative correlations correspond to regimes associated with the anti-Zeno effect (AZE).
PHYSICAL REVIEW LETTERS
(2022)
Article
Computer Science, Theory & Methods
Marco Genovese
Summary: Investigating whether quantum nonlocality, represented by the EPR paradox, can be explained by considering extra dimensions.
INTERNATIONAL JOURNAL OF QUANTUM INFORMATION
(2023)
Article
Multidisciplinary Sciences
Gaurav Nirala, Siva T. Pradyumna, Ashok Kumar, Alberto M. Marino
Summary: The ability to encode and transmit information using the temporal and spatial degrees of freedom of quantum states of light is crucial for an efficient quantum network. However, there is still a lack of control required to fully utilize the high dimensionality of the spatial degree of freedom. In this study, we encode information in the spatial correlations of entangled twin beams, taking advantage of their dependence on the angular spectrum of the pump for four-wave mixing. We demonstrate that the encoded information can only be extracted through joint spatial measurements of the twin beams, without modifying the temporal quantum correlations.
Article
Optics
Giuseppe Ortolano, Alberto Paniate, Pauline Boucher, Carmine Napoli, Sarika Soman, Silvania F. Pereira, Ivano Ruo-Berchera, Marco Genovese
Summary: Quantum entanglement and squeezing have improved phase estimation and imaging beyond the classical limits in interferometric settings. However, the advantage of quantum in non-interferometric phase imaging methods commonly used in the classical domain, such as ptychography and diffractive imaging, is still lacking. In this study, we demonstrate the enhancement of imaging a pure phase object in a non-interferometric setting by exploiting entanglement, measuring only the phase effect on the free-propagating field.
LIGHT-SCIENCE & APPLICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Emilio Corte, Selene Sachero, Sviatoslav Ditalia Tchernij, Tobias Luhmann, Sebastien Pezzagna, Paolo Traina, Ivo Pietro Degiovanni, Ekaterina Moreva, Paolo Olivero, Jan Meijer, Marco Genovese, Jacopo Forneris
Summary: A systematic investigation of the spectral emission properties of individual optical defects in diamond is reported, and three spectral lines at different wavelengths are attributed to the SnV center. The relative occurrence of these lines can be modified by surface treatment. The relevant emission properties of each class of emitters are reported.
ADVANCED PHOTONICS RESEARCH
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
Alice Meda, Cecilia Clivati, Salvatore Virzi, Simone Donadello, Alberto Mura, Filippo Levi, Marco Genovese, Ivo Degiovanni, Davide Calonico
Summary: The integration of QKD protocols in metropolitan networks requires addressing the challenges posed by unstable optical channels and background photons. Researchers have proposed an interferometry-based solution for precise channel length control and demonstrated its effectiveness.
2022 IEEE 15TH WORKSHOP ON LOW TEMPERATURE ELECTRONICS (WOLTE 2022)
(2022)
