Article
Nanoscience & Nanotechnology
Minkyung Kim, Dasol Lee, Yeseul Kim, Junsuk Rho
Summary: This study proposes nanophotonic-assisted approaches to increase the precision of weak measurement by controlling the spin Hall effect of light. The refractive index sensing experiment proves the feasibility of the method, and a single-layer metasurface is introduced as an experimental platform.
Article
Optics
Manchao Zhang, Jie Zhang, Chunwang Wu, Yi Xie, Ting Chen, Wei Wu, Pingxing Chen
Summary: This paper improves the precision of estimating an unknown parameter by introducing a precoupling process with properly chosen interaction operators. By tracking the meter wave functions, it is found that the improvement in estimation precision comes from a precoupling induced modulation of the meter wave function, reaching the most sensitive regime with respect to the parameter. The estimation error is effectively suppressed by averaging the estimations resulted from different initial meter states. These results are demonstrated through a numerical simulation compared to the standard weak-value amplification scheme.
Article
Materials Science, Multidisciplinary
Sajede Harraz, Jiao-Yang Zhang, Shuang Cong
Summary: This study proposes a teleportation protocol for teleporting an unknown qubit through amplitude damping channels. By utilizing environment-assisted measurement and weak measurement, high fidelity and high success probability can be achieved during the teleportation process. For third-party assisted teleportation, the decoherence of shared entanglement can be completely suppressed by using environment-assisted measurement.
RESULTS IN PHYSICS
(2023)
Article
Quantum Science & Technology
Yan-Ling Li, Fengxiao Sun, Jing Yang, Xing Xiao
Summary: The study reexamined quantum teleportation from a Fisher information perspective, proposing two schemes to enhance the teleportation of quantum Fisher information under amplitude damping channel. It was found that the environment-assisted measurement scheme outperforms the weak measurement scheme in improving the quantum Fisher information transfer.
QUANTUM INFORMATION PROCESSING
(2021)
Article
Telecommunications
Sajede Harraz, Shuang Cong, Juan J. Nieto
Summary: This letter proposes a scheme to protect quantum teleportation from decoherence using environment assisted measurement and flip operations, significantly improving the teleportation fidelity. The explicit formula for the average teleportation fidelity and success probability of the entanglement protection are derived.
IEEE COMMUNICATIONS LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Qianqian Jia, Jinye Li, Chuangchuang Wei, Jianguo Liu
Summary: This paper presents a microwave photonic reconfigurable high precision simple instantaneous frequency measurement system. It achieves high measurement accuracy over a wide bandwidth with the assistance of stacking ensemble learning method. By introducing electrical and optical delays, the range and accuracy of the instantaneous frequency measurement method can be flexibly adjusted to suit different scenarios. Experimental results demonstrate an average measurement error of 4.39 MHz from 11 GHz to 17 GHz. This simple system exhibits reconfigurability and on-chip integration possibilities without dispersion elements, showing great potential in future integrated array radar, detection, and other fields.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Physics, Multidisciplinary
Sajede Harraz, Shuang Cong, Juan J. Nieto
Summary: This paper introduces a quantum state recovery scheme based on environment assisted measurement using weak measurements and flip operations. The proposed scheme significantly improves the success probability of recovering the system from a decoherence channel for all initial states. The explicit formulas for total fidelity and success probability of recovering N-qubit GHZ state are derived.
INTERNATIONAL JOURNAL OF THEORETICAL PHYSICS
(2022)
Article
Physics, Multidisciplinary
Lotte Mertens, Jasper van Wezel
Summary: The argument of environment-assisted invariance (envariance) is commonly used in quantum measurement models to justify their ability to produce accurate statistics, particularly linear models. However, recent research has shown that linear collapse models cannot reproduce Born's rule. In this study, we address this contradiction and identify an inconsistency in the assumptions underlying envariance-based arguments. By explicitly considering the construction of a measurement machine, we demonstrate that envariance does not guarantee that every measurement will follow Born's rule. Instead, it implies that a measurement machine can be constructed for every quantum state, which yields Born's rule when measuring that specific state. This resolution aligns with the recent finding that objective collapse models must be nonlinear.
Article
Physics, Multidisciplinary
Guohui Kan, Jinxia Feng, Li Chen, Yuanji Li, Kuanshou Zhang
Summary: Stable low-frequency squeezed vacuum states were generated and used for phase and amplitude measurements, achieving quantum improvements beyond the shot-noise limit in certain frequency ranges. This study demonstrates the feasibility and potential applications of fiber-based quantum-enhanced sensors.
Article
Optics
An-Ning Xu, Yong-Chun Liu
Summary: This study investigates the improvement of optomechanical precision measurements by tuning the optomechanical interaction without using squeezed light source. The tuning of mechanical susceptibility using optical force enhances the measurement sensitivity and broadens the working bandwidth. This approach provides a new avenue for significant improvement to optomechanical precision-measurement systems.
Article
Optics
Jia-Yin Peng, Yi Xiang
Summary: By utilizing special single-qubit measurement bases, a bidirectional remote state preparation (BRSP) scheme was introduced to prepare two arbitrary single-qubit states in a noiseless quantum channel. The scheme was then modified to a joint BRSP scheme and extended to prepare multi-qubit states. The discussion also focused on the preparation fidelity under simulation of amplitude damping (AD) noise, with the incorporation of weak measurements for improved fidelity. Numerical simulations demonstrated that weak measurements were beneficial in enhancing the proposed BRSP in the presence of AD noise.
OPTICS COMMUNICATIONS
(2021)
Article
Physics, Multidisciplinary
B. Ohayon, G. Janka, I Cortinovis, Z. Burkley, L. de Sousa Borges, E. Depero, A. Golovizin, X. Ni, Z. Salman, A. Suter, C. Vigo, T. Prokscha, P. Crivelli
Summary: We present a new measurement of the n = 2 Lamb shift in Muonium, which shows a significant improvement compared to previous studies. By comparing our result with theoretical calculations, we are able to set limits on Lorentz and CPT violation in the muonic sector, as well as explore new physics related to muons and electrons that could potentially explain the muon g - 2 anomaly.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Zhang Jiao-Yang, Cong Shuang, Wang Chi, Sajede Harraz
Summary: This paper proposes a novel decoherence suppression scheme using weak measurement and environment-assisted measurement, which is applicable for protecting quantum states from decoherence channels. The scheme demonstrates strong practicality and superior performance, making it important for significant quantum computing and communication tasks.
ACTA PHYSICA SINICA
(2022)
Article
Optics
Shenzhen Lv, Qian Kemao
Summary: This study proposes a complete precision model chain for fringe projection profilometry (FPP), which includes stage models for camera intensity, fringe intensity, phase, and 3D geometry, as well as transfer models from fringe intensity to phase and from phase to 3D geometry. The key contributions of this model chain include the adoption of a non-Gaussian camera noise model and the formulation of the phase to geometry transfer, allowing for the explicit and concise representation of the precision of measured geometry. This theoretical model makes FPP a more designable technique to meet various measurement demands.
LIGHT-SCIENCE & APPLICATIONS
(2023)
Review
Medicine, General & Internal
Shigehiro Karashima, Issey Osaka
Summary: Steroid hormones are present in all organisms and are widely used in the medical field. Monitoring hormone levels helps assess physiological changes associated with aging, disease risk, and disease diagnosis and treatment effects. Mass spectrometry-based methods are more specific for measuring steroid hormones compared to immunoassays, but they come with higher costs and technical requirements.
JOURNAL OF CLINICAL MEDICINE
(2022)
Article
Multidisciplinary Sciences
Alexey Tiranov, Vasiliki Angelopoulou, Bjorn Schrinski, Cornelis Jacobus van Diepen, Oliver August Dall Alba Sandberg, Ying Wang, Leonardo Midolo, Sven Scholz, Andreas Dirk Wieck, Arne Ludwig, Anders Sondberg Sorensen, Peter Lodahl
Summary: Photon emission is fundamental for light-matter interaction and photonic quantum science. This study demonstrates distant dipole-dipole radiative coupling in solid-state optical quantum emitters embedded in a nanophotonic waveguide. The collective response and emission dynamics can be controlled by proper excitation techniques. This work is a foundational step towards multiemitter applications for scalable quantum-information processing.
Article
Quantum Science & Technology
Ming Lai Chan, Alexey Tiranov, Martin Hayhurst Appel, Ying Wang, Leonardo Midolo, Sven Scholz, Andreas D. Wieck, Arne Ludwig, Anders Sondberg Sorensen, Peter Lodahl
Summary: We have demonstrated high-fidelity on-chip entanglement between an incoming photon and a stationary quantum-dot hole spin qubit using self-assembled quantum dots integrated into nanostructures. The entanglement is induced by sequential scattering of the time-bin encoded photon interleaved with active spin control within a microsecond, two orders of magnitude faster than other solid-state platforms. The entanglement fidelity is immune to the spectral wandering of the emitter when conditioned on the detection of a reflected photon. These results represent a major step towards realizing a quantum node capable of interchanging information with flying photons and on-chip quantum logic for quantum networks and repeaters.
NPJ QUANTUM INFORMATION
(2023)
Article
Quantum Science & Technology
Salvatore Chiavazzo, Anders S. Sorensen, Oleksandr Kyriienko, Luca Dellantonio
Summary: We study a nonlinearly coupled electromechanical system and establish a quantitative theory for two-phonon cooling. Two-phonon cooling reduces the mechanical Hilbert space to its ground and first excited states, enabling quantum operations on individual phonons and the preparation of nonclassical mechanical states. We propose a scheme for implementing arbitrary Bloch sphere rotations and derive the fidelity for a specific case. We also analyze detrimental processes that degrade coherence and demonstrate the feasibility of our scheme in state-of-the-art electromechanical devices.
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
Physics, Multidisciplinary
Valentin Walther, Anders S. Sorensen
Summary: In this research, it was discovered that semiconductor Rydberg excitons, which are weakly coupled to free-space light mode, can produce strongly antibunched fields, known as quantum light. This effect is driven by a micron-scale excitation blockade between Rydberg excitons that induces pair-wise polariton scattering events. Photons incident on an exciton resonance are scattered into blue- and red-detuned pairs, which are relatively protected from absorption and dominate the transmitted light. The results show that this effect persists even in the presence of additional phonon coupling, strong nonradiative decay, and across a wide range of experimental parameters. Our findings pave the way for studying quantum statistics from weakly coupled semiconductor excitons.
PHYSICAL REVIEW LETTERS
(2023)
Article
Optics
Eva M. Gonzalez-Ruiz, Freja T. Ostfeldt, Ravitej Uppu, Peter Lodahl, Anders S. Sorensen
Summary: We analyzed the entanglement properties of deterministic path-entangled photonic states generated by coupling the emission of a quantum-dot biexciton cascade to a chiral nanophotonic waveguide. Our analysis considered realistic experimental imperfections, such as imperfect chiral emitter-photon interactions and asymmetric coupling of exciton levels due to fine-structure splitting, along with time jitter in photon detection. The results showed that this approach offers a promising platform for generating entanglement in integrated nanophotonic systems despite the presence of these imperfections.
Article
Optics
Yannick Seis, Benjamin J. Brown, Anders S. Sorensen, Joseph F. Goodwin
Summary: In this work, we improve the memory performance of a noise-biased trapped-ion-qubit memory by incorporating error correction through teleportation of information between two repetition codes written on a pair of qubit registers. We show that our protocol can be achieved with a single global entangling phase gate of remarkably low fidelity, and rebalancing the logical spin-flip and dephasing error rates can significantly lower the error rates of our memory.
Article
Quantum Science & Technology
Kah Jen Wo, Guus Avis, Filip Rozpedek, Maria Flors Mor-Ruiz, Gregor Pieplow, Tim Schroeder, Liang Jiang, Anders S. Sorensen, Johannes Borregaard
Summary: This study proposes a resource-efficient one-way quantum repeater that utilizes quantum error-correcting codes to counteract loss and operational error rates in a communication channel. By minimizing resource overhead and using tailored error-correcting codes, reliable quantum bit transmission can be achieved over intercontinental distances.
NPJ QUANTUM INFORMATION
(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.
Article
Physics, Multidisciplinary
Konstantin Tiurev, Anders S. Sorensen
Summary: This paper proposes a physically motivated method for experimentally assessing the fidelity of cluster states. The method provides a lower bound of the fidelity with a number of measurement settings scaling only linearly with the system size and can accurately account for errors likely to occur in experiments.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Optics
Eva M. Gonzalez-Ruiz, Sumanta K. Das, Peter Lodahl, Anders S. Sorensen
Summary: This paper investigates the possibility of violating Bell's inequality using deterministic single-photon sources. A detailed analysis of a scheme for achieving such violations over long distances is provided, with immediate extensions to device-independent quantum key distribution. The effects of experimental imperfections on real-world single-photon sources are also investigated. The performance requirements for state-of-the-art deterministic single-photon sources based on quantum dots are benchmarked, and it is found that experimental realizations seem to be feasible. The requirements for a postselected version of the protocol are also evaluated.
Article
Physics, Multidisciplinary
Tanay Roy, Liang Jiang, David Schuster
Summary: Grover's quantum search algorithm provides a quadratic quantum advantage over classical algorithms for unstructured search problems. We present a modified version that returns the correct result with certainty without user control over the quantum search oracle. The visualization using the Bloch sphere enhances geometric intuition.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Physics, Multidisciplinary
Wen-Long Ma, Shu-Shen Li, Liang Jiang
Summary: This research reveals the algebraic structure of path-independent quantum control and provides an exact and unified condition for combating ancilla noise.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Optics
Kaushik P. Seshadreesan, Prajit Dhara, Ashlesha Patil, Liang Jiang, Saikat Guha
Summary: This study focuses on the generation of high-fidelity graph states composed of realistic, finite-energy approximate GKP-encoded qubits in the photonic qubit architecture. The researchers track the transformation of the graph states under GKP-Steane error-correction and fusion operations using standard Gaussian dynamics, and provide an exact coherent error model to shed light on the error-correction properties of these graph states.
Article
Optics
Senrui Chen, Sisi Zhou, Alireza Seif, Liang Jiang
Summary: We demonstrate that entangled measurements provide an exponential advantage in sample complexity for Pauli channel estimation, which is a fundamental problem and a necessary subroutine for benchmarking near-term quantum devices. Through our research, we provide an estimation protocol using ancilla that significantly reduces the number of copies of the Pauli channel required for accurate estimation. We also explore the benefits of a limited number of ancillas and how to apply the estimation protocol to practical quantum benchmarking tasks.
