المؤلفون: Kim, Ryeong Myeong¹ (AUTHOR), Han, Jeong Hyun¹ (AUTHOR), Lee, Soo Min¹ (AUTHOR), Kim, Hyeohn¹ (AUTHOR), Lim, Yae-Chan¹ (AUTHOR), Lee, Hye-Eun¹ (AUTHOR), Ahn, Hyo-Yong¹ (AUTHOR), Lee, Yoon Ho¹ (AUTHOR), Ha, In Han¹ (AUTHOR), Nam, Ki Tae¹ (AUTHOR) nkitae@snu.ac.kr

المصدر: Journal of Chemical Physics. 2/14/2024, Vol. 160 Issue 6, p1-14. 14p.

مصطلحات موضوعية: *PLASMONICS, *SQUEEZED light, *MIRROR symmetry, *SYMMETRY breaking, *CHIRALITY, *CHIRALITY of nuclear particles

مستخلص: Molecular chirality is represented as broken mirror symmetry in the structural orientation of constituent atoms and plays a pivotal role at every scale of nature. Since the discovery of the chiroptic property of chiral molecules, the characterization of molecular chirality is important in the fields of biology, physics, and chemistry. Over the centuries, the field of optical chiral sensing was based on chiral light–matter interactions between chiral molecules and polarized light. Starting from simple optics-based sensing, the utilization of plasmonic materials that could control local chiral light–matter interactions by squeezing light into molecules successfully facilitated chiral sensing into noninvasive, ultrasensitive, and accurate detection. In this Review, the importance of plasmonic materials and their engineering in chiral sensing are discussed based on the principle of chiral light–matter interactions and the theory of optical chirality and chiral perturbation; thus, this Review can serve as a milestone for the proper design and utilization of plasmonic nanostructures for improved chiral sensing. [ABSTRACT FROM AUTHOR]

المؤلفون: Almas, S. Mohammadi¹ (AUTHOR) sanazmohammadi@uma.ac.ir, Najarbashi, G.¹ (AUTHOR) najarbashi@uma.ac.ir, Tavana, A.¹ (AUTHOR) tavana@uma.ac.ir

المصدر: International Journal of Geometric Methods in Modern Physics. Jul2024, Vol. 21 Issue 8, p1-25. 25p.

مصطلحات موضوعية: *SQUEEZED light, *GEOMETRIC quantum phases, *DECOMPOSITION method, *COHERENT states, *INTERFEROMETRY

مستخلص: In this paper, we investigate the geometric phase (GP) of two-mode entangled squeezed-coherent states (ESCSs), undergoing unitary cyclic evolution. Results show that increasing the squeezing parameter of either mode of the balanced ESCS compresses the GP elliptically with respect to the coherence parameter of the corresponding mode. While in the case of unbalanced ESCS, the GP is compressed hyperbolically by increasing the squeezing parameters of the either mode. By generalizing the approach to higher constituting-state dimensions, it is found that the GPs of both balanced and unbalanced ESCSs, increase for a specific value of the coherence parameter. By analyzing the states through the Schmidt decomposition method, we find that, locally, the balanced and unbalanced ESCSs are unitarily equivalent. Finally, based on the interferometry technique, we suggest a theoretical scheme for the physical generation of ESCSs. [ABSTRACT FROM AUTHOR]

المؤلفون: An, Haechan^1,2 (AUTHOR), Najjar Amiri, Ali² (AUTHOR), Goronzy, Dominic P.³ (AUTHOR), Garcia Wetten, David A.³ (AUTHOR), Bedzyk, Michael J.^3,4,5 (AUTHOR), Shakouri, Ali¹ (AUTHOR), Hersam, Mark C.^3,5,6 (AUTHOR), Hosseini, Mahdi^1,2,5 (AUTHOR) mh@northwestern.edu

المصدر: Applied Physics Letters. 6/24/2024, Vol. 124 Issue 26, p1-7. 7p.

مصطلحات موضوعية: *PHOTONS, *SQUEEZED light, *QUANTUM correlations, *SEMICONDUCTOR devices, *SEMICONDUCTOR materials, *ELECTRONIC equipment

مستخلص: Detecting electronic hot spots is important for understanding the heat dissipation and thermal management of electronic and semiconductor devices. Optical thermoreflective imaging is being used to perform precise temporal and spatial imaging of heat on wires and semiconductor materials. We apply quantum squeezed light to perform thermoreflective imaging on micro-wires, surpassing the shot-noise limit of classical approaches. We obtain a far-field temperature sensing accuracy of 42 mK after 50 ms of averaging and show that a 256 × 256 pixel image can be constructed with such sensitivity in 10 min. We can further obtain single-shot temperature sensing of 1.6 K after only 10 μ s of averaging, enabling a dynamical study of heat dissipation. Not only do the quantum images provide accurate spatiotemporal information about heat distribution but also the measure of quantum correlation provides additional information, inaccessible by classical techniques, which can lead to a better understanding of the dynamics. We apply the technique to both aluminum and niobium microwires and discuss the applications of the technique in studying electron dynamics at low temperatures. [ABSTRACT FROM AUTHOR]

المؤلفون: Noury, Azadeh¹ (AUTHOR), Tavassoly, M. K.¹ (AUTHOR) mktavassoly@yazd.ac.ir

المصدر: Quantum Information Processing. Jun2024, Vol. 23 Issue 6, p1-17. 17p.

مصطلحات موضوعية: *COHERENT states, *SQUEEZED light, *EQUATIONS of motion, *QUANTUM computing, *QUANTUM information science, *COHERENT radiation

مستخلص: Nonlinear optical phenomena have noticeable importance in quantum computation and quantum information processing. The optical nonlinearity leads to the generation of new frequency components possessing nonclassical properties. In this paper, we have investigated nonclassical properties of output beams from a degenerate parametric amplifier (DPA) based on both linear and nonlinear coherent state approaches. Considering the rotating wave approximation, solutions of the Heisenberg equations of motion associated with the standard coherent and nonlinear coherent radiation fields are compared. Nonclassical properties including the first- and second-order squeezing, anti-bunching and photon statistics are investigated for the signal mode starting with different input field states. The calculations based on both approaches confirm the existence of the first-order squeezing in position quadrature ( x ^ 1 (X ^ 1) for linear(nonlinear) approach) of the field with no squeezing in momentum quadrature, while the second-order squeezing occurs in the momentum quadrature of the field ( x ^ 2 (X ^ 2) for linear(nonlinear) approach) with no squeezing in position quadrature. In addition, photon statistics has been studied wherein anti-bunching has been observed using both approaches. The comparison of the obtained results from the two approaches confirms that in the nonlinear approach the nonclassical properties of the output beams are more amplified. [ABSTRACT FROM AUTHOR]

المؤلفون: Mayero, Christopher^1,2 (AUTHOR) cmayero@tmu.ac.ke, Omolo, Joseph Akeyo² (AUTHOR)

المصدر: Quantum Information Processing. May2024, Vol. 23 Issue 5, p1-35. 35p.

مصطلحات موضوعية: *SQUEEZED light, *COHERENCE (Optics), *ATOMS, *PHOTONS, *COHERENT states

مستخلص: We analyse the dynamics generated by the anti-Jaynes–Cummings (AJC) Hamiltonian when a two-level atom in an initial atomic ground state couples to a single mode of squeezed coherent light and provide a juxtaposition with the Jaynes–Cummings (JC) interaction for the same initial atom–field states. In the AJC resonant atom–field interaction condition, we noted robust anti-bunching of the squeezed coherent cavity field mode within regions of strong coupling of the atom and the squeezed coherent cavity field mode. In addition, bunching of the field mode occurs when frequency detuning present in the sum frequency is raised while still in the strong coupling region. However, the field mode in the corresponding JC process still displays an immutable anti-bunching. This marked difference is driven by a non-vanishing frequency detuning parameter present during the AJC process. Further, clear enhancement of squeezing effect manifested by an increase in the degree of mixedness and ringing revivals triggered by increase of the squeeze parameter, frequency detuning and sum frequency is observed. Despite similarity in pattern of the coextensive atomic population inversion curves at resonance, the AJC process provides a longer quiescent phase, of atomic population inversion. This feature changes at the respective off-resonance conditions, where at a specified squeeze parameter, the AJC, JC processes have equal revival time. [ABSTRACT FROM AUTHOR]

المؤلفون: Taewon Park^1,2, Stokowski, Hubert¹, Ansari, Vahid¹, Gyger, Samuel¹, Multani, Kevin K. S.^1,3, Celik, Oguz Tolga^1,2, Hwang, Alexander Y.¹, Dean, Devin J.¹, Mayor, Felix¹, McKenna, Timothy P.⁴, Fejer, Martin M.¹, Safavi-Naeini, Amir¹ safavi@stanford.edu

المصدر: Science Advances. 3/15/2024, Vol. 10 Issue 11, p1-7. 7p.

مصطلحات موضوعية: *OPTICAL parametric oscillators, *SQUEEZED light, *OPTICAL tomography, *QUANTUM noise, *SECOND harmonic generation, *PARAMETRIC oscillators

مستخلص: Quantum optical technologies promise advances in sensing, computing, and communication. A key resource is squeezed light, where quantum noise is redistributed between optical quadratures. We introduce a monolithic, chip-scale platform that exploits the (2) nonlinearity of a thin-film lithium niobate (TFLN) resonator device to efficiently generate squeezed states of light. Our system integrates all essential components--except for the laser and two detectors--on a single chip with an area of one square centimeter, reducing the size, operational complexity, and power consumption associated with conventional setups. Using the balanced homodyne measurement subsystem that we implemented on the same chip, we measure a squeezing of 0.55 decibels and an anti-squeezing of 1.55 decibels. We use 20 milliwatts of input power to generate the parametric oscillator pump field by using second harmonic generation on the same chip. Our work represents a step toward compact and effficient quantum optical systems posed to leverage the rapid advances in integrated nonlinear and quantum photonics. [ABSTRACT FROM AUTHOR]

المؤلفون: Wu, Yimiao¹ (AUTHOR), Tian, Long^1,2 (AUTHOR), Yao, Wenxiu¹ (AUTHOR), Shi, Shaoping¹ (AUTHOR) ssp4208@sxu.edu.cn, Liu, Xuan¹ (AUTHOR), Lu, Bo¹ (AUTHOR), Wang, Yajun^1,2 (AUTHOR), Zheng, Yaohui^1,2 (AUTHOR) yhzheng@sxu.edu.cn

المصدر: Applied Physics Letters. 3/11/2024, Vol. 124 Issue 11, p1-6. 6p.

مصطلحات موضوعية: *QUANTUM teleportation, *SQUEEZED light, *QUANTUM cryptography, *TOPOLOGY

مستخلص: Quantum network allows communication among more than two users with quantum teleportation and high quantum fidelity enabled by non-classical resources. As one of the most versatile architectures, all users are connected mediated by the central station in the star topology network, leading to the realization of the information interconnection and interoperability. In this work, we experimentally demonstrate a 4-branch continuous variable (CV) quantum teleportation network with star topology by employing entangled sideband modes from one squeezed state of light. Here, multiple pairs of entangled sideband modes are distributed on demand to central station and four nodes, respectively. Each node linked to the network has its own communication channel with the central station, where the deterministic CV quantum teleportation protocol is implemented with the fidelities above 0.830. [ABSTRACT FROM AUTHOR]

المؤلفون: Chabar, Noura¹ (AUTHOR), Amghar, M'bark¹ (AUTHOR), Amazioug, Mohamed¹ (AUTHOR) amazioug@gmail.com, Nassik, Mostafa¹ (AUTHOR)

المصدر: European Physical Journal D (EPJ D). Mar2024, Vol. 78 Issue 3, p1-7. 7p.

مصطلحات موضوعية: *SQUEEZED light, *QUANTUM correlations, *COUPLINGS (Gearing), *PHONONS, *PHOTONS, *POLARONS

مستخلص: In this manuscript, we investigate the enhancement of the transfer of quantum correlations from squeezed light to movable mirrors within an optomechanical system. This enhancement was achieved via the injection of squeezed light in the cavities and via intracavity squeezed light. We quantify the entanglement between mechanical oscillators via logarithmic negativity. We demonstrate that entanglement is influenced by various factors, including the gain of the parametric amplifier, the squeezing parameter characterizing the squeezed light, the rate of the phonon tunneling process, the coupling strength of the photon hopping process and the bath temperature of the mechanical oscillators. We have shown that entanglement can be improved by a convenient choice of coupling strength in the case of the photon hopping process, as well as for specified values of the gain of the parametric amplifier. [ABSTRACT FROM AUTHOR]

المؤلفون: Volkoff, T J¹ (AUTHOR) volkoff@lanl.gov

المصدر: Journal of Physics A: Mathematical & Theoretical. 2/10/2024, Vol. 57 Issue 6, p1-13. 13p.

مصطلحات موضوعية: *SQUEEZED light, *COHERENT states, *LIGHTING, *TRANSMITTERS (Communication)

مستخلص: In analyses of target detection with Gaussian state transmitters in a thermal background, the thermal occupation is taken to depend on the target reflectivity in a way which simplifies the analysis of the symmetric quantum hypothesis testing problem. However, this assumption precludes comparison of target detection performance between an arbitrary transmitter and a vacuum state transmitter, i.e. 'detection without illumination', which is relevant in a bright thermal background because a target can be detected by its optical shadow or some other perturbation of the background. Using a target-agnostic thermal environment leads to the result that the oft-claimed 6 dB possible reduction in the quantum Chernoff exponent for a two-mode squeezed vacuum transmitter over a coherent state transmitter in high-occupation thermal background is an unachievable limiting value, only occurring in a limit in which the target detection problem is ill-posed. Further analyzing quantum illumination in a target-agnostic thermal environment shows that a weak single-mode squeezed transmitter performs worse than 'no illumination', which is explained by the noise-increasing property of reflected low-intensity squeezed light. [ABSTRACT FROM AUTHOR]

المؤلفون: Hidki, Abdelkader¹ (AUTHOR) abdelkader.hidki@gmail.com, Lakhfif, Abderrahim¹ (AUTHOR) abderrahimlakhfif@gmail.com, El Qars, Jamal^1,2 (AUTHOR) j.elqars@uiz.ac.ma, Nassik, Mostafa¹ (AUTHOR) m.nassik@uiz.ac.ma

المصدر: International Journal of Modern Physics B: Condensed Matter Physics; Statistical Physics; Applied Physics. 11/10/2023, Vol. 37 Issue 28, p1-15. 15p.

مصطلحات موضوعية: *QUANTUM correlations, *SQUEEZED light, *QUANTUM coherence, *YTTRIUM iron garnet, *QUANTUM states, *BEAM splitters, *QUANTUM entanglement

مستخلص: In this paper, we investigate a system composed of two spatially separated cavities, each with a magnon mode of a yttrium iron garnet (YIG) sphere coupled to a microwave (MW) cavity and phonon modes, respectively, via linear beam splitter and magnetostrictive interactions. In addition, two-mode squeezed vacuum fields drive the two cavities. We investigate and compare the behavior of three nonclassicality indicators in two subsystems (i.e., magnon–magnon and phonon–phonon) under the influences of the temperature, the cavity–magnon damping rate, and the magnomechanical coupling rate. We use the entanglement of formation (EoF) to measure the degree of entanglement, the Gaussian quantum discord (GQD) to characterize the quantum correlations beyond entanglement and Gaussian quantum coherence (GQC) to quantify coherence. Considering that the quantifiers share the same entropic definition, we compare the three quantifiers and test the validity of the hypothesis that quantum states with nonzero discord are inherently entangled. We find, on the one hand, that both GQC and GQD exhibit freezing behavior and that they are more robust to the decoherence effect than the EoF. On the other hand, the EoF and the GQD are always upper bounded by GQC, and there is no simple dominance relationship between EoF and GQD; hence these two quantifiers should not be compared. The effect of other parameters is also discussed in detail. [ABSTRACT FROM AUTHOR]