Optica Quantum最新文献

Shaping entangled photons through arbitrary scattering media using an advanced wave beacon 利用先进的波信标通过任意散射介质塑造纠缠光子

Optica Quantum Pub Date : 2024-08-09 DOI: 10.1364/opticaq.525445

Ronen Shekel, Ohad Lib, Yaron Bromberg

引用次数: 0

High-dimensional quantum correlation measurements with an adaptively gated hybrid single-photon camera 利用自适应门控混合单光子照相机进行高维量子相关测量

Optica Quantum Pub Date : 2024-05-23 DOI: 10.1364/opticaq.522894

Sanjukta Kundu, Jerzy Szuniewicz, Grzegorz Firlik, Alexander Krupinski-Ptaszek, Radek Lapkiewicz

引用次数: 0

Toward heralded distribution of polarization entanglement 极化纠缠的预示性分布

Optica Quantum Pub Date : 2024-05-10 DOI: 10.1364/opticaq.515316

F. Joseph Marcellino, Patrik Caspar, Tiff Brydges, Hugo Zbinden, Rob Thew

{"title":"Toward heralded distribution of polarization entanglement","authors":"F. Joseph Marcellino, Patrik Caspar, Tiff Brydges, Hugo Zbinden, Rob Thew","doi":"10.1364/opticaq.515316","DOIUrl":"https://doi.org/10.1364/opticaq.515316","url":null,"abstract":"Distributing entangled states over potentially long distances provides a key resource for many protocols in quantum communication and quantum cryptography. Ideally, this should be implemented in a heralded manner. Starting with four single-photon states, we cascade two single-photon path-entangled states, coded in orthogonal polarizations, to distribute and herald polarization entanglement in a single quantum repeater link architecture. By tuning the input states to minimize (local) losses, the theoretically achievable fidelity to the target state without postselection approaches 1, while sacrificing heralding rates. We achieve a fidelity to the target state of over 95% after postselection, providing a benchmark for the experimental control and allowing a first demonstration of a device-independent quantum key distribution architecture capable of operation over relevant distances. We show that the fidelity of the heralded state without postselection scales predictably and also identify various practical challenges and error sources specific to this architecture, and model their effects on the generated state. While our experiment uses probabilistic photon-pair sources based on spontaneous parametric downconversion, many of these problems are also relevant for variants employing deterministic photon sources.","PeriodicalId":501828,"journal":{"name":"Optica Quantum","volume":"13 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141869715","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Distribution of telecom entangled photons through a 7.7 km antiresonant hollow-core fiber 电信纠缠光子在 7.7 千米反谐振空芯光纤中的分布

Optica Quantum Pub Date : 2024-04-24 DOI: 10.1364/opticaq.514257

Michael Antesberger, Carla M. D. Richter, Francesco Poletti, Radan Slavík, Periklis Petropoulos, Hannes Hübel, Alessandro Trenti, Philip Walther, Lee A. Rozema

引用次数: 0

Increasing quantum communication rates using hyperentangled photonic states 利用超纠缠光子态提高量子通信速率

Optica Quantum Pub Date : 2024-04-18 DOI: 10.1364/opticaq.520406

Liat Nemirovsky-Levy, Uzi Pereg, Mordechai Segev

{"title":"Increasing quantum communication rates using hyperentangled photonic states","authors":"Liat Nemirovsky-Levy, Uzi Pereg, Mordechai Segev","doi":"10.1364/opticaq.520406","DOIUrl":"https://doi.org/10.1364/opticaq.520406","url":null,"abstract":"Quantum communication is based on the generation of quantum states and exploitation of quantum resources for communication protocols. Currently, photons are considered as the optimal carriers of information, because they enable long-distance transition with resilience to decoherence and they are relatively easy to create and detect. Entanglement is a fundamental resource for quantum communication and information processing, and it is of particular importance for quantum repeaters. Hyperentanglement, a state where parties are entangled with two or more degrees of freedom (DoFs) simultaneously, provides an important additional resource because it increases data rates and enhances error resilience. However, in photonics, the channel capacity, i.e., the ultimate throughput, is fundamentally limited when dealing with linear elements. We propose a technique for achieving higher transmission rates for quantum communication by using hyperentangled states, based on multiplexing multiple DoFs on a single photon, transmitting the photon, and eventually demultiplexing the DoFs to different photons at the destination, using Bell state measurements. Following our scheme, one can generate two entangled qubit pairs by sending only a single photon. The proposed transmission scheme lays the groundwork for novel quantum communication protocols with higher transmission rates and refined control over scalable quantum technologies.","PeriodicalId":501828,"journal":{"name":"Optica Quantum","volume":"16 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141869932","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Multifold enhancement of quantum SNR by using an EMCCD as a photon number resolving device 利用 EMCCD 作为光子数解析装置，成倍提高量子信噪比

Optica Quantum Pub Date : 2024-04-18 DOI: 10.1364/opticaq.518037

Rounak Chatterjee, Vikas S. Bhat, Kiran Bajar, Sushil Mujumdar

{"title":"Multifold enhancement of quantum SNR by using an EMCCD as a photon number resolving device","authors":"Rounak Chatterjee, Vikas S. Bhat, Kiran Bajar, Sushil Mujumdar","doi":"10.1364/opticaq.518037","DOIUrl":"https://doi.org/10.1364/opticaq.518037","url":null,"abstract":"Electron multiplying charge-coupled devices (EMCCDs), owing to their high quantum efficiency and spatial resolution, are widely used to study typical quantum optical phenomena and related applications. Researchers have already developed a procedure that enables one to statistically determine whether a pixel detects a single photon, based on whether its output is higher or lower than the estimated noise level. However, these techniques are feasible at extremely low photon numbers (≈0.15 mean number of photons per pixel per exposure), allowing for at most one photon per pixel. This limitation necessitates a very large number of frames required for any study. In this work, we present a method to estimate the mean rate of photons per pixel per frame for arbitrary exposure time. Subsequently, we make a statistical estimate of the number of photons (≥ 1) incident on each pixel. This allows us to effectively use the EMCCD as a photon number resolving device. This immediately augments the acceptable light levels in the experiments, leading to significant reduction in the required experimentation time. As evidence of our approach, we quantify contrast in quantum correlation exhibited by a pair of spatially entangled photons generated by a spontaneous parametric down conversion process. In comparison with conventional methods, our method realizes an enhancement in the signal-to-noise ratio (SNR) by approximately a factor of 3 for half the data collection time. This SNR can be easily enhanced by minor modifications in experimental parameters such as exposure time, etc.","PeriodicalId":501828,"journal":{"name":"Optica Quantum","volume":"23 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141869743","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

High-quality single InGaAs/GaAs quantum dot growth on a silicon substrate for quantum photonic applications 在硅衬底上生长出用于量子光子应用的高质量 InGaAs/GaAs 单量子点

Optica Quantum Pub Date : 2024-04-12 DOI: 10.1364/opticaq.510829

Imad Limame, Peter Ludewig, Ching-Wen Shih, Marcel Hohn, Chirag C. Palekar, Wolfgang Stolz, and Stephan Reitzenstein

{"title":"High-quality single InGaAs/GaAs quantum dot growth on a silicon substrate for quantum photonic applications","authors":"Imad Limame, Peter Ludewig, Ching-Wen Shih, Marcel Hohn, Chirag C. Palekar, Wolfgang Stolz, and Stephan Reitzenstein","doi":"10.1364/opticaq.510829","DOIUrl":"https://doi.org/10.1364/opticaq.510829","url":null,"abstract":"Developing non-classical light sources for use in quantum information technology is a primary goal of quantum nanophotonics. Significant progress has been made in this area using quantum dots grown on III/V semiconductor substrates. However, it is crucial to develop quantum light sources based on silicon wafers to facilitate large-scale integration of electronic circuits and quantum photonic structures. We present a method for the direct heteroepitaxial growth of high-quality InGaAs quantum dots on silicon, which enables the fabrication of scalable and cost-effective quantum photonics devices that are compatible with silicon technology. To achieve high-quality GaAs heterostructures, we apply an intermediate GaP buffer and defect-reducing layers on a silicon substrate. The epitaxially grown quantum dots exhibit optical and quantum-optical properties similar to reference ones based on conventional GaAs substrates. The distributed Bragg reflector used as a backside mirror enables us to achieve bright emission with up to (18 ± 1)% photon extraction efficiency. Additionally, the quantum dots exhibit strong multi-photon suppression with g(2)(τ) = (3.7 ± 0.2) × 10−2 and high photon indistinguishability V = (66 ± 19)% under non-resonant excitation. These results indicate the high potential of our heteroepitaxy approach in the field of silicon-compatible quantum nanophotonics. Our approach can pave the way for future chips that combine electronic and quantum photonic functionality.","PeriodicalId":501828,"journal":{"name":"Optica Quantum","volume":"50 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140592799","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Number-state reconstruction with a single single-photon avalanche detector 利用单个单光子雪崩探测器进行数态重构

Optica Quantum Pub Date : 2024-04-11 DOI: 10.1364/opticaq.504308

Patrick R. Banner, Deniz Kurdak, Yaxin Li, Alan Migdall, J. V. Porto, and S. L. Rolston

{"title":"Number-state reconstruction with a single single-photon avalanche detector","authors":"Patrick R. Banner, Deniz Kurdak, Yaxin Li, Alan Migdall, J. V. Porto, and S. L. Rolston","doi":"10.1364/opticaq.504308","DOIUrl":"https://doi.org/10.1364/opticaq.504308","url":null,"abstract":"Single-photon avalanche detectors (SPADs) are crucial sensors of light for many fields and applications. However, they are not able to resolve photon number, so typically more complex and more expensive experimental setups or devices must be used to measure the number of photons in a pulse. Here, we present a methodology for performing photon number-state reconstruction with only one SPAD. The methodology, which is cost-effective and easy to implement, uses maximum-likelihood techniques with a detector model whose parameters are measurable. We achieve excellent agreement between known input pulses and their reconstructions for coherent states with up to ≈10 photons and peak input photon rates up to several Mcounts/s. When detector imperfections are small, we maintain good agreement for coherent pulses with peak input photon rates of over 40 Mcounts/s, greater than one photon per detector dead time. For anti-bunched light, the reconstructed and independently measured pulse-averaged values of g(2)(0) are also consistent with one another. Our algorithm is applicable to light pulses whose pulse width and correlation time scales are both at least a few detector dead times. These results, achieved with single commercially available SPADs, provide an inexpensive number-state reconstruction method and expand the capabilities of single-photon detectors.","PeriodicalId":501828,"journal":{"name":"Optica Quantum","volume":"3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140571430","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Highly efficient visible and near-IR photon pair generation with thin-film lithium niobate 利用薄膜铌酸锂实现高效可见光和近红外光子对生成

Optica Quantum Pub Date : 2024-04-10 DOI: 10.1364/opticaq.507526

Nathan A. Harper, Emily Y. Hwang, Ryoto Sekine, Luis Ledezma, Christian Perez, Alireza Marandi, and Scott K. Cushing

{"title":"Highly efficient visible and near-IR photon pair generation with thin-film lithium niobate","authors":"Nathan A. Harper, Emily Y. Hwang, Ryoto Sekine, Luis Ledezma, Christian Perez, Alireza Marandi, and Scott K. Cushing","doi":"10.1364/opticaq.507526","DOIUrl":"https://doi.org/10.1364/opticaq.507526","url":null,"abstract":"Efficient on-chip entangled photon pair generation at telecom wavelengths is an integral aspect of emerging quantum optical technologies, particularly for quantum communication and computing. However, moving to shorter wavelengths enables the use of more accessible silicon detector technology, and opens up applications in imaging and spectroscopy. Here, we present high brightness ((1.6 ± 0.3) × 109 pairs/s/mW/nm) visible–near-IR photon pair generation in a periodically poled lithium niobate nanophotonic waveguide. The degenerate spectrum of the photon pairs is centered at 811 nm with a bandwidth of 117 nm when pumped with a spectrally multimode laser diode. The measured on-chip source efficiency of (2.3 ± 0.5) × 1011 pairs/s/mW is on par with source efficiencies at telecom wavelengths and is also orders of magnitude higher than the efficiencies of other visible sources implemented in bulk crystal or diffused waveguide-based technologies. Further improvements in the brightness and efficiencies are possible by pumping the device with a single-frequency laser, which would also shrink the pair bandwidth. These results represent the shortest wavelength of photon pairs generated in a nanophotonic waveguide reported to date by nearly an octave.","PeriodicalId":501828,"journal":{"name":"Optica Quantum","volume":"55 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140571470","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Time-delayed single satellite quantum repeater node for global quantum communications 用于全球量子通信的延时单卫星量子中继节点

Optica Quantum Pub Date : 2024-04-10 DOI: 10.1364/opticaq.517495

Mustafa Gündoǧan, Jasminder S. Sidhu, Markus Krutzik, Daniel K. L. Oi

{"title":"Time-delayed single satellite quantum repeater node for global quantum communications","authors":"Mustafa Gündoǧan, Jasminder S. Sidhu, Markus Krutzik, Daniel K. L. Oi","doi":"10.1364/opticaq.517495","DOIUrl":"https://doi.org/10.1364/opticaq.517495","url":null,"abstract":"Global-scale quantum networking faces significant technical and scientific obstacles. Quantum repeaters (QRs) have been proposed to overcome the inherent direct transmission range limit through optical fiber. However, QRs are typically limited to a total distance of a few thousand kilometers and/or require extensive hardware overhead. Recent proposals suggest that strings of space-borne QRs with on-board quantum memories (QMs) are able to provide global coverage. Here, we propose an alternative to such repeater constellations using a single satellite with two QMs that effectively acts as a time-delayed version of a single QR node. By physically transporting stored qubits, our protocol improves long-distance entanglement distribution with reduced system complexity over previous proposals. We estimate the amount of secure key in the finite block regime and demonstrate an improvement of at least three orders of magnitude over prior single-satellite methods that rely on a single QM, while simultaneously reducing the necessary memory capacity similarly. We propose an experimental platform to realize this scheme based on rare-earth ion doped crystals with appropriate performance parameters. By exploiting recent advances in quantum memory lifetimes, we are able to significantly reduce system complexity while achieving high key rates, bringing global quantum networking closer to implementation.","PeriodicalId":501828,"journal":{"name":"Optica Quantum","volume":"47 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141869742","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0