Article
Optics
Yuri Malakyan
Summary: This article presents a linear Hong-Ou-Mandel (HOM) scheme based on lossless three-wave mixing in laser-controlled tripod-type atoms. The scheme allows two photons of different frequencies to interfere, enabling controlled transfer of quantum information in hybrid quantum networks. The proposed scheme is robust to photon polarization indistinguishability, making it versatile for use in various quantum network architectures.
Article
Optics
David Petrosyan, Klaus Molmer
Summary: The study focuses on the collective radiation properties of cold, trapped ensembles of atoms in the high-density regime, finding a strong enhancement in photon emission rate in elongated atomic clouds. The absorption-emission spectrum is broadened and shifted to lower frequencies compared to noninteracting or single-atom spectrum, and analysis is done on the spatial and temporal profiles of emitted radiation. Additionally, exploration is conducted on efficiently exciting collective superradiant states of the atomic ensemble from a long-lived storage state for matter-light interfaces in quantum computation and communication applications.
Article
Physics, Multidisciplinary
Markus Hiekkamaki, Robert Fickler
Summary: Two-photon interference in multiple transverse-spatial modes along a single beam-path was studied, with observations of coalescence and anticoalescence in different spatial-mode multiports. This operation within spatial modes along a single beam path eliminates the need for interferometric stability and presents new pathways for implementing complex quantum information tasks using linear optical networks.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Frank Schlawin
Summary: In this paper, the two-photon absorption (TPA) of entangled photons in a molecular ensemble with inhomogeneous broadening is simulated. The results are compared with the case of homogeneous broadening, and the consequences for the possible quantum enhancement of TPA cross sections are discussed. It is found that although there are differences in the TPA cross section, the difference always remains small and of the order unity. The impact of the polarization degrees of freedom is further considered, and the orientational average of a model system Hamiltonian is carried out. Certain molecular geometries are found to give rise to a substantial polarization dependence of the entangled TPA rate, which can increase the TPA cross section by up to a factor of five.
FRONTIERS IN PHYSICS
(2022)
Article
Physics, Multidisciplinary
Chao Liu, Tao Tu, Pei-Yun Li, Xiao Liu, Xing-Yu Zhu, Zong-Quan Zhou, Chuan-Feng Li, Guang-Can Guo
Summary: This article proposes a scheme for implementing a filtering protocol in atomic ensembles and demonstrates its key steps in an experiment. By using a rare-earth-ion-doped crystal, entanglement between electron and nuclear spins is successfully prepared at a sample temperature of 100 mK. The versatility, robustness, and potential scalability of this scheme contribute to the construction of quantum repeaters and quantum networks based on atomic ensembles.
COMMUNICATIONS PHYSICS
(2022)
Article
Optics
Wen-Bo Xing, Xiao-Min Hu, Yu Guo, Bi-Heng Liu, Chuan-Feng Li, Guang-Can Guo
Summary: This study proposes a preparation protocol of multiphoton GHZ state with arbitrary dimensions for optical systems. Auxiliary entanglements realize a high-dimensional entanglement gate to connect the high-dimensional entangled pairs to a multipartite high-dimensional GHZ state. Specifically, we use the path degrees of freedom of photons to prepare a four-partite, three-dimensional GHZ state. Our method can be extended to other degrees of freedom to generate arbitrary GHZ entanglements in any dimension.
Article
Physics, Multidisciplinary
G. Enzian, J. J. Price, L. Freisem, J. Nunn, J. Janousek, B. C. Buchler, P. K. Lam, M. R. Vanner
Summary: Adding or subtracting a single quantum of excitation to a thermal state of a bosonic system has the counter-intuitive effect of approximately doubling its mean occupation. The experimental demonstration in this study showed the doubling of mechanical thermal fluctuations using single-phonon addition and subtraction. This joint click-dyne detection scheme opens up new possibilities for optomechanical quantum science and applications.
PHYSICAL REVIEW LETTERS
(2021)
Article
Optics
Shenchao Jin, Han Bao, Junlei Duan, Xingda Lu, Mingfeng Wang, Kai-Feng Zhao, Heng Shen, Yanhong Xiao
Summary: The spin-squeezed state is a multi-body entangled state of great interest for precision measurements. The adiabatic pulse control of the pump field in state preparation is essential for noise suppression, which is necessary for achieving spin squeezing and has significance for quantum metrology applications.
PHOTONICS RESEARCH
(2021)
Article
Optics
Yusef Maleki, Chaofan Zhou, M. Suhail Zubairy
Summary: This study presents the chiral transfer of quantum information in a metal nanoring network, enabling the transport and processing of chiral quantum states in nanorings by breaking the time-reversal symmetry. The direction of chirality can be controlled by preparing a quantum dot in its ground or excited state, achieving perfect or partial chiral transfer of excitation. The synthetic magnetic field used allows for the generation of specifically tailored nanoring states.
Article
Physics, Applied
L. Heller, J. Lowinski, K. Theophilo, A. Padron-Brito, H. de Riedmatten
Summary: This study demonstrates the storage and retrieval of an on-demand single photon in a low-noise Raman quantum memory, showing potential for efficient quantum repeater links.
PHYSICAL REVIEW APPLIED
(2022)
Article
Optics
Xian-Li Yin, Wen -Bin Luo, Jie-Qiao Liao
Summary: We study the disentanglement dynamics of two giant atoms coupled to a one-dimensional waveguide, focusing on the non-Markovian effect due to the retardation. By considering the photon transmission time, we solve the time-delayed equations to obtain the evolution of entanglement between the two giant atoms. We find that the retardation-induced non-Markovianity leads to nonexponential decay and revivals of entanglement. We also investigate the dependence of disentanglement on different coupling configurations, detuning effect, initial-state phase effect, and initial state composition.
Article
Multidisciplinary Sciences
Robert Stockill, Moritz Forsch, Frederick Hijazi, Gregoire Beaudoin, Konstantinos Pantzas, Isabelle Sagnes, Remy Braive, Simon Groblacher
Summary: In this study, the authors demonstrate bi-directional on-chip conversion between microwave and optical frequencies using a gallium phosphide optomechanical resonator. The remarkable properties of the material and the appropriate optical pump enable efficient photon conversion, establishing gallium phosphide as a versatile platform for ultra-low-noise conversion of photons between microwave and optical frequencies.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Multidisciplinary
Xingchang Wang, Jianmin Wang, Ying Zuo, Liang Dong, Georgios A. Siviloglou, Jiefei Chen
Summary: The researchers experimentally demonstrated a new spin wave thermometry method that can measure the temperature of a cold atomic ensemble optical quantum memory. This technique is highly suitable for probing the atomic motion in elongated clouds, which are commonly used in quantum memories, and can provide comparable precision for different types of memories.
Article
Optics
Mads M. Lund, Fan Yang, Klaus Molmer
Summary: We numerically simulate the interaction of photon pulses with a two-level scatterer in a chiral waveguide QED setup using a cascaded system approach. The scattering of a two-photon pulse may result in the predominant population of only two output wave packet modes in an entangled state, |2 , 0) - |0 , 2). In a complementary wave-packet basis, this is a product state of two orthogonal single-photon wave packets. Reversing this process allows the perfect merging of distinguishable single-photon wave packets into a single-mode pulse carrying two identical photons.
Article
Quantum Science & Technology
Naeimeh Mohseni, Marek Narozniak, Alexey N. Pyrkov, Valentin Ivannikov, Jonathan P. Dowling, Tim Byrnes
Summary: This study investigates an error-protected encoding of the AQC Hamiltonian, using qubit ensembles instead of individual qubits. With increasing ensemble sizes, AQC performance improves and the ground state becomes protected, as long as the decoherence rate is sufficiently low.
NPJ QUANTUM INFORMATION
(2021)
Article
Physics, Multidisciplinary
Morgan W. Mitchell
NEW JOURNAL OF PHYSICS
(2020)
Article
Physics, Multidisciplinary
Vindhiya Prakash, Aleksandra Sierant, Morgan W. Mitchell
Summary: The technique described in the passage measures photon pair joint spectra by detecting the interference of nondegenerate photon pairs at a beam splitter. It is used to study photon-photon interactions and is well suited for characterizing pairs of photons, achieving successful implementation of correlated effects in experiments.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Wei Du, Jia Kong, Guzhi Bao, Peiyu Yang, Jun Jia, Sheng Ming, Chun-Hua Yuan, J. F. Chen, Z. Y. Ou, Morgan W. Mitchell, Weiping Zhang
Summary: The paper presents a new interferometer topology that nests a SU(2) interferometer inside a SU(1,1) interferometer. This new interferometer achieves high signal-to-noise ratio, sensitivity beyond the standard quantum limit, and tolerance to photon losses. Experimental results demonstrate its effectiveness in addressing the issue of photon losses in interferometers.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
C. Troullinou, R. Jimenez-Martinez, J. Kong, V. G. Lucivero, M. W. Mitchell
Summary: The study examines the impact of optical polarization squeezing on the performance of an optically pumped magnetometer, demonstrating that probe polarization squeezing improves high-frequency sensitivity and increases measurement bandwidth while avoiding measurement backaction noise. The research provides a model for the dynamics of quantum noise in the magnetometer, showing how polarization squeezing reduces optical noise and shunts measurement backaction into the unmeasured spin component.
PHYSICAL REVIEW LETTERS
(2021)
Article
Multidisciplinary Sciences
Silvana Palacios Alvarez, Pau Gomez, Simon Coop, Roberto Zamora-Zamora, Chiara Mazzinghi, Morgan W. Mitchell
Summary: We present a magnetic sensor with extremely high energy resolution, applied in the detection of Rb-87 single-domain spinor Bose-Einstein condensates. By utilizing nondestructive Faraday rotation probing, we have achieved a low-frequency magnetic sensitivity of 72(8) fT, and measured the volume, spin coherence time, and readout noise of the condensate experimentally.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Multidisciplinary Sciences
Sebastian Toepfer, Marta Gilaberte Basset, Jorge Fuenzalida, Fabian Steinlechner, Juan P. Torres, Markus Grafe
Summary: Holography uses interference of a light field to reconstruct the spatial shape of an object, but traditional methods are limited by detection constraints outside the visible range. By implementing phase-shifting holography with nonclassical states of light and quantum interference between two-photon probability amplitudes, it is possible to overcome these limitations and retrieve the spatial shape of transmitted/reflected photons from the object.
Article
Optics
Arturo Villegas, Mario A. Quiroz-Juarez, Alfred B. U'Ren, Juan P. Torres, Roberto de J. Leon-Montiel
Summary: In this study, we propose and demonstrate a smart laser-diffraction analysis technique for identifying particle mixtures. By using model particles, we accurately retrieve information about two-component heterogeneous mixtures with high accuracy. The method simplifies implementation and paves the way for the development of novel smart identification technologies.
Article
Physics, Applied
Michael C. D. Tayler, Kostas Mouloudakis, Rasmus Zetter, Dominic Hunter, Vito G. Lucivero, Sven Bodenstedt, Lauri Parkkonen, Morgan W. Mitchell
Summary: Atomic spin sensors, with their compact microfabricated packages, show great potential for precision measurements. This study focuses on enhancing the performance of these sensors through magnetic field control using miniature coils. The results demonstrate the effectiveness of the coils in laboratory-scale magnetometers and magnetoencephalography applications.
PHYSICAL REVIEW APPLIED
(2022)
Article
Optics
Daniel F. Urrego, Juan P. Torres
Summary: We propose and experimentally demonstrate a quantum-inspired protocol for quantifying the degree of similarity between two spatial shapes in optical beams without the need for amplitude and phase measurement. Instead, the desired information can be obtained by measuring the degree of polarization of the combined optical beam, which is easier to implement experimentally. The protocol utilizes non-separable optical beams, where different degrees of freedom (polarization and spatial shape) cannot be described independently. One important feature of this method is its ability to compare two unknown spatial shapes.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION
(2022)
Article
Physics, Multidisciplinary
Lorena C. Bianchet, Natalia Alves, Laura Zarraoa, Tomas Lamich, Vindhiya Prakash, Morgan W. Mitchell
Summary: In this study, we present precise subwavelength optical intensity measurements using a single trapped 87Rb atom as a sensor. The intensity is measured by the scalar ac Stark shift it produces on the hyperfine transition of the D2 line. We demonstrate the method by measuring the intensity at the focus of an optical tweezer.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Optics
Sven Bodenstedt, Morgan W. Mitchell, Michael C. D. Tayler
Summary: This study discusses procedures for error-tolerant spin control in environments that allow transient, large-angle reorientation of a magnetic bias field. By using short sequences of nonresonant magnetic-field pulses in a laboratory-frame meridional plane, robust z inversion in proton (H-1) nuclear magnetic resonance near Earth's field is demonstrated.
Article
Optics
Arturo Rojas-Santana, Gerard J. Machado, Maria V. Chekhova, Dorilian Lopez-Mago, Juan P. Torres
Summary: This study analyzes and compares the output signals obtained in three different configurations of optical coherence tomography (OCT) in order to evaluate the performance of different configurations in extracting information about the sample. The configurations include standard OCT and two types of OCT schemes based on nonlinear interferometers, with the optical sectioning of the sample achieved by measuring the output signal spectrum.
Article
Optics
Oscar Cordero, Arturo Villegas, Juan-Rafael Alvarez, Roberto de J Leon-Montiel, M. H. M. Passos, Juan P. Torres
Summary: The concept of quantum discord aims to uncover quantum correlations beyond entanglement, but its original formulation is difficult to compute. Alternative forms like geometric measure and local quantum uncertainty have been developed, which can be easily evaluated in certain quantum systems. Research shows that these two measures are equivalent in 2xD dimensional bipartite quantum systems.
Article
Optics
D. Goncalves, M. W. Mitchell, D. E. Chang
Summary: This approach aims to engineer photon correlations by utilizing separate pump and probe beams to increase atomic emission and balance it with the probe, effectively overcoming inefficient atom-light coupling. By tuning the pump amplitude, the correlation function g((2))(0) can be adjusted from zero (perfect antibunching) to infinite (extreme bunching), showing that the physically unchanged coupling efficiency can be enhanced through the addition of the pump beam.
Article
Optics
Safoura S. Mirkhalaf, Daniel Benedicto Orenes, Morgan W. Mitchell, Emilia Witkowska
Summary: The study shows that the estimation of the control parameter in a ferromagnetic Bose-Einstein condensate exhibits the same scaling beyond the standard quantum limit near critical points and away from critical points. Depletion of the m(f) = 0 Zeeman sublevel and transverse magnetization are identified as signals capable of saturating sensitivity scaling. The results suggest the feasibility of sub-standard quantum limit sensing in ferromagnetic condensates with current experimental capabilities.
