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Scaling up solid-state quantum photonics
摘要： A deterministic interface between a single atom and a single optical photon is the essential building block underpinning many quantum applications of light for quantum communication, sensing, and simulations. Light and matter interact weakly with each other, so the challenge is to create conditions enabling strong interactions. Fortunately, solid-state quantum photonics has matured dramatically, and it is possible to create artificial photonic nanostructures that markedly enhance light-matter coupling. Moreover, single atoms, which are cumbersome to control experimentally because they need to be trapped and cooled, can be replaced by solid-state quantum emitters such as vacancy centers in diamond, molecules, or quantum dots. The high quality and purity of these systems now imply that coherent and near-deterministic photon-emitter interfaces are routinely constructed, but it is still challenging to scale up and deterministically couple multiple quantum emitters. On page 662 of this issue, Evans et al. report on the successful coupling of two diamond silicon vacancy (SiV) quantum emitters mediated by their mutual coupling to a nanophotonic cavity. Radiative coupling leads to the formation of an entangled state between the two emitters.
关键词： diamond,entanglement,silicon vacancies,solid-state quantum photonics,quantum optics
更新于2025-09-11 14:15:04
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Sub-terahertz and terahertz generation in long-wavelength quantum cascade lasers
摘要： Terahertz quantum cascade laser sources with intra-cavity non-linear frequency mixing are the first room-temperature electrically pumped monolithic semiconductor sources that operate in the 1.2–5.9 THz spectral range. However, high performance in low-frequency range is difficult because converted terahertz waves suffer from significantly high absorption in waveguides. Here, we report a sub-terahertz electrically pumped monolithic semiconductor laser. This sub-terahertz source is based on a high-performance, long-wavelength (λ?≈?13.7 μm) quantum cascade laser in which high-efficiency terahertz generation occurs. The device produces peak output power of 11 μW within the 615–788 GHz frequency range at room temperature. Additionally, a source emitting at 1.5 THz provides peak output power of 287 μW at 110?K. The generated terahertz radiation of <2 THz is mostly attributable to the optical rectification process in long-wavelength infrared quantum cascade lasers.
关键词： integrated transitions,difference frequency generation,intersubband,cascade laser,terahertz,quantum optics devices
更新于2025-09-11 14:15:04
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Analytical solution of a three-level atom coupled to four systems of N-two-level atoms
摘要： The analytical solution of a three-level atom interacting with four systems of N-two-level atoms is studied. The atomic inversion and the correlation function as applications of this model are discussed. In addition, the effects of the quantum numbers and the coupling parameters between spins on the atomic inversion and the correlation function are investigated. The analysis of results manifests that correlated behavior can be controlled by adjusting the coupling parameters between spins. Besides, we can use parameters as controller, by which the required behavior, whether classical or non-classical, is identified.
关键词： Quantum optics,Atomic inversion,Correlation function,Systems of N-two-level atoms
更新于2025-09-11 14:15:04
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Approximating vibronic spectroscopy with imperfect quantum optics
摘要： We study the impact of experimental imperfections on a recently proposed protocol for performing quantum simulations of vibronic spectroscopy. Specifically, we propose a method for quantifying the impact of these imperfections, optimizing an experiment to account for them, and benchmarking the results against a classical simulation method. We illustrate our findings using a proof of principle experimental simulation of part of the vibronic spectrum of tropolone. Our findings will inform the design of future experiments aiming to simulate the spectra of large molecules beyond the reach of current classical computers.
关键词： quantum optics,boson sampling,squeezed light,quantum simulation,vibronic spectroscopy,quantum chemistry
更新于2025-09-10 09:29:36
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An Arbitrated Proxy Blind Signature Based on Hyper Entanglement Analysis
摘要： Motivated by the hyperentangled Bell states analysis, an arbitrated quantum proxy blind signature (QPBS) scheme is developed. Four participants accomplish the task of signing and verifying via exchanging the entanglement of polarization and spatial-mode degrees of freedom. Alice blinds message and sends it to a proxy signatory David who is delegated by the original signatory Charlie. David generates a signature using the delegating code while Bob verifies the signing with the help of an arbitrator Trent. Unlike previous schemes, the verifying phase is no longer executed only by a recipient. Analysis shows that when the even numbers of blinding string always equal 1, the scheme protects the proxy blind signature against forgery and disavow while maintaining the properties of verifiability and identifiability.
关键词： Blind signature,Quantum optics,Proxy signature,Hyper entanglement
更新于2025-09-10 09:29:36
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Strong Coupling in Microcavity Structures: Principle, Design, and Practical Application
摘要： When interaction between light and matter is in the strong coupling region, matter has a significant influence on the whole system, with potential to develop low-power active optical devices. Strong coupling can verify some basic problems of quantum physics, and it is an ideal system to study light–matter interaction, providing an intuitive and accurate demonstration of some pure quantum effects with small mass and easy optical control. Here, the most important advances in strong coupling in recent years are described. Of late, an extensive series of experimental and theoretical findings, and remarkable achievements have been made in this field. Strong coupling between cavities and some new materials such as semiconductors, two-dimensional (2D) material, and quantum dots (QDs) are the focus of research in this field. Another field that has made outstanding progress is the application of this optical phenomenon, including resonance-enhanced Raman and infrared spectra, nanolasers, and cavity-enhanced sensing. Furthermore, the potential in this field arises for future quantum information and quantum optical devices. It is now developing at a very fast rate and can be predicted to have broad prospects for development in the future. Some prospects in terms of design and application are included.
关键词： strong coupling,vacuum Rabi splitting,optical devices,quantum optics
更新于2025-09-10 09:29:36
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Resource-efficient fibre-integrated temporal multiplexing of heralded single photons
摘要： We present a multiplexed single photon source that re-synchronises heralded single photons generated by four-wave mixing in photonic crystal fibre using a fibre delay loop controlled by a single switch. By combining the probabilities of generating heralded single photons on four consecutive pump pulses we obtain an enhancement of the per-bin single-photon delivery probability. Our source demonstrates a way in which single-photon source multiplexing may be carried out with minimised resource overhead while retaining the benefits of a robust and alignment-free platform.
关键词： nonlinear optics,quantum optics,optical fibres
更新于2025-09-09 09:28:46
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Theory of interacting cavity Rydberg polaritons
摘要： Photonic materials are an emerging platform to explore quantum matter (Carusotto and Ciuti 2013 Rev. Mod. Phys. 85 299; Sommer et al 2015 arXiv:1506.00341) and quantum dynamics (Peyronel et al 2012 Nature 488 57). The development of Rydberg electromagnetically induced transparency (Weatherill et al 2008 J. Phys. B: At. Mol. Opt. Phys. 41 201002; Petrosyan et al 2011 Phys. Rev. Lett. 107 213601) provided a clear route to strong interactions between individual optical photons. In conjunction with carefully designed optical resonators, it is now possible to achieve extraordinary control of the properties of individual photons, introducing tunable gauge ?elds (Schine et al 2016 Nature 534 671) whilst imbuing the photons with mass and embedding them on curved spatial manifolds (Sommer et al 2016 New J. Phys. 18 035008). Building on work formalizing Rydberg mediated interactions between propagating photons (Gorshkov et al 2011 Phys. Rev. Lett. 107 133602; Gullans et al 2016 Phys. Rev. Lett. 117 113601), we develop a theory of interacting Rydberg polaritons in multimode optical resonators, where the strong interactions are married with tunable single particle properties to build and probe exotic matter. In the presence of strong coupling between the resonator ?eld and a Rydberg-dressed atomic ensemble, a quasiparticle called the ‘cavity Rydberg polariton’ emerges. We investigate its properties, ?nding that it inherits both the fast dynamics of its photonic constituents and the strong interactions of its atomic constituents. We develop tools to properly renormalize the interactions when polaritons approach each other, and investigate the impact of atomic motion on the coherence of multi-mode polaritons, showing that most channels for atom-polariton cross-thermalization are strongly suppressed. Finally, we propose to harness the repeated diffraction and refocusing of the optical resonator to realize interactions which are local in momentum-space. This work points the way to ef?cient modeling of polaritonic quantum materials in properly renormalized strongly interacting effective theories, thereby enabling experimental studies of photonic fractional quantum Hall ?uids and crystals (Sommer et al 2015 arXiv:1506.00341; Umucal?lar et al 2014 Phys. Rev. A 89 023803; Grusdt and Fleischhauer 2013 Phys. Rev. A 87 043628), plus photonic quantum information processors and repeaters (Jaksch et al 2000 Phys. Rev. Lett. 85 2208; Saffman et al 2010 Rev. Mod. Phys. 82 2313; Han et al 2010 Phys. Rev. A 81, 052311).
关键词： quantum gases,Rydberg polaritons,quantum optics
更新于2025-09-09 09:28:46
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Effect of the mechanical oscillator on the optical-response properties of an optical trimer system
摘要： We propose theoretically a four-mode coupled optomechanical system to explore the optical-response properties of an optical trimer system consisting of a passive cavity, a no-loss-gain cavity, and an active cavity coupled with a mechanical oscillator. In the study, the passive cavity is driven by an external laser so that the stability of the coupled system depends strongly on the gain-to-loss ratio and the photon tunneling between the adjacent cavities. We ?nd that in the regime near the stable-unstable critical point, the resonance absorption of the optical trimer system changes quickly with the increasing gain of the active cavity. In contrast, when the mechanical oscillator is coupled to the passive cavity, the center absorption peak is split and a phenomenon of optomechanically induced transparency appears. Consequently, two additional resonance peaks in the absorption pro?le are induced by the optomechanical coupling, which hinges on the tunneling between the optical cavities and also on the gain of the active cavity. The dependence of the width of the transparency window on the optomechanical coupling and the driving strength is also discussed in detail. The results obtained here indicate that the optical properties of the trimer system can be manipulated by coupling a mechanical oscillator to the system and therefore have a potential application in quantum optics and quantum information processing.
关键词： optomechanically induced transparency,quantum information processing,mechanical oscillator,quantum optics,optomechanical system,optical trimer system
更新于2025-09-09 09:28:46
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Super-resolution enhancement by quantum image scanning microscopy
摘要： The principles of quantum optics have yielded a plethora of ideas to surpass the classical limitations of sensitivity and resolution in optical microscopy. While some ideas have been applied in proof-of-principle experiments, imaging a biological sample has remained challenging, mainly due to the inherently weak signal measured and the fragility of quantum states of light. In principle, however, these quantum protocols can add new information without sacrificing the classical information and can therefore enhance the capabilities of existing super-resolution techniques. Image scanning microscopy, a recent addition to the family of super-resolution methods, generates a robust resolution enhancement without reducing the signal level. Here, we introduce quantum image scanning microscopy: combining image scanning microscopy with the measurement of quantum photon correlation allows increasing the resolution of image scanning microscopy up to twofold, four times beyond the diffraction limit. We introduce the Q-ISM principle and obtain super-resolved optical images of a biological sample stained with fluorescent quantum dots using photon antibunching, a quantum effect, as a resolution-enhancing contrast mechanism.
关键词： image scanning microscopy,quantum dots,quantum optics,super-resolution microscopy,photon antibunching
更新于2025-09-09 09:28:46