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Journal of optics. B, Quantum and semiclassical optics : journal of the European Optical Society最新文献

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Semiconductor sources of twin photons for quantum information 用于量子信息的双光子半导体源
Journal of optics. B, Quantum and semiclassical optics : journal of the European Optical Society Pub Date : 2005-07-01 DOI: 10.1088/1464-4266/7/7/005
S. Ducci, L. Lanco, Y. Seurin, G. Leo, V. Berger, A. Rossi, X. Marcadet
{"title":"Semiconductor sources of twin photons for quantum information","authors":"S. Ducci, L. Lanco, Y. Seurin, G. Leo, V. Berger, A. Rossi, X. Marcadet","doi":"10.1088/1464-4266/7/7/005","DOIUrl":"https://doi.org/10.1088/1464-4266/7/7/005","url":null,"abstract":"A large number of scientific proposals made in the last few years are based on transport and manipulation of information using single quantum objects. Some of them make use of entanglement in pairs of particles such as twin photons. Although theoretical proposals have demonstrated highly interesting perspectives in the quantum information domain, experimental realizations and applications still suffer from the complexity of experimental set-ups and technological limitations. This paper presents various approaches aiming at efficient twin photon semiconductor sources. The emergence of these compact and integrated devices would be an important technological breakthrough in quantum information applications.","PeriodicalId":87441,"journal":{"name":"Journal of optics. B, Quantum and semiclassical optics : journal of the European Optical Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2005-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1088/1464-4266/7/7/005","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60919095","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: 6
Asymptotics of a quantum random walk driven by an optical cavity 光学腔驱动的量子随机游走的渐近性
Journal of optics. B, Quantum and semiclassical optics : journal of the European Optical Society Pub Date : 2005-07-01 DOI: 10.1088/1464-4266/7/7/004
D. Ellinas, I. Smyrnakis
{"title":"Asymptotics of a quantum random walk driven by an optical cavity","authors":"D. Ellinas, I. Smyrnakis","doi":"10.1088/1464-4266/7/7/004","DOIUrl":"https://doi.org/10.1088/1464-4266/7/7/004","url":null,"abstract":"We investigate a novel quantum random walk (QRW) model, of possible use in quantum algorithm implementation, that achieves a quadratically faster diffusion rate compared to its classical counterpart. We evaluate its asymptotic behaviour expressed in the form of a limit probability distribution of a double-horn shape. Questions of robustness and control of that limit distribution are addressed by introducing a quantum optical cavity in which a resonant Jaynes–Cummings type of interaction between the quantum walk coin system realized in the form of a two-level atom and a laser field is taking place. Driving the optical cavity by means of the coin–field interaction time and the initial quantum coin state, we determine two types of modification of the asymptotic behaviour of the QRW. In the first one the limit distribution is robustly reproduced up to a scaling, while in the second one the quantum features of the walk, exemplified by an enhanced diffusion rate, are washed out and Gaussian asymptotics prevail. Verification of these findings in an experimental set-up that involves two quantum optical cavities that implement the driven QRW and its quantum to classical transition is discussed.","PeriodicalId":87441,"journal":{"name":"Journal of optics. B, Quantum and semiclassical optics : journal of the European Optical Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2005-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1088/1464-4266/7/7/004","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60918970","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: 13
Quantum dots as single-photon sources for quantum information processing 量子点作为单光子源用于量子信息处理
Journal of optics. B, Quantum and semiclassical optics : journal of the European Optical Society Pub Date : 2005-06-30 DOI: 10.1088/1464-4266/7/7/001
D. Unitt, A. Bennett, P. Atkinson, K. Cooper, P. See, D. Gevaux, M. Ward, R. Stevenson, D. Ritchie, A. Shields
{"title":"Quantum dots as single-photon sources for quantum information processing","authors":"D. Unitt, A. Bennett, P. Atkinson, K. Cooper, P. See, D. Gevaux, M. Ward, R. Stevenson, D. Ritchie, A. Shields","doi":"10.1088/1464-4266/7/7/001","DOIUrl":"https://doi.org/10.1088/1464-4266/7/7/001","url":null,"abstract":"Semiconductor pillar microcavities containing quantum dots have shown promise as efficient sources of single and correlated pairs of photons, which may find applications in quantum information processing. In this paper we discuss the use of these sources to generate single photons and the use of pillars with elliptical cross-section to enhance and select a particular photon state. Single-photon interference measurements are also performed and show coherence times of up to 180 ps for quasi-resonantly pumped dots. Hong–Ou–Mandel-type two-photon interference measurements using a fibre interferometer indicate that individually created photons display a large degree of indistinguishability.","PeriodicalId":87441,"journal":{"name":"Journal of optics. B, Quantum and semiclassical optics : journal of the European Optical Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2005-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1088/1464-4266/7/7/001","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60918622","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: 22
Local versus nonlocal cloning in a noisy environment 嘈杂环境中的局部克隆与非局部克隆
Journal of optics. B, Quantum and semiclassical optics : journal of the European Optical Society Pub Date : 2005-06-20 DOI: 10.1088/1464-4266/7/12/013
A. Ferraro, M. Paris
{"title":"Local versus nonlocal cloning in a noisy environment","authors":"A. Ferraro, M. Paris","doi":"10.1088/1464-4266/7/12/013","DOIUrl":"https://doi.org/10.1088/1464-4266/7/12/013","url":null,"abstract":"We address the distribution of quantum information among many parties in the presence of noise. In particular, we consider how to optimally send to m receivers the information encoded into an unknown coherent state. On one hand, a local strategy is considered, consisting in a local cloning process followed by direct transmission. On the other hand, a telecloning protocol based on nonlocal quantum correlations is analysed. Both the strategies are optimized to minimize the detrimental effects due to losses and thermal noise during the propagation. The comparison between the local and the nonlocal protocol shows that telecloning is more effective than local cloning for a wide range of noise parameters. Our results indicate that nonlocal strategies can be more robust against noise than local ones, thus being suitable candidates for playing a major role in quantum information networks.","PeriodicalId":87441,"journal":{"name":"Journal of optics. B, Quantum and semiclassical optics : journal of the European Optical Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2005-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1088/1464-4266/7/12/013","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60914485","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: 3
Preparing multi-partite entanglement of photons and matter qubits 制备光子和物质量子比特的多部纠缠
Journal of optics. B, Quantum and semiclassical optics : journal of the European Optical Society Pub Date : 2005-06-20 DOI: 10.1088/1464-4266/7/7/006
P. Kok, S. Barrett, T. Spiller
{"title":"Preparing multi-partite entanglement of photons and matter qubits","authors":"P. Kok, S. Barrett, T. Spiller","doi":"10.1088/1464-4266/7/7/006","DOIUrl":"https://doi.org/10.1088/1464-4266/7/7/006","url":null,"abstract":"We show how to make event-ready multi-partite entanglement between qubits which may be encoded on photons or matter systems. Entangled states of matter systems, which can also act as single photon sources, can be generated using the entangling operation presented in Barrett and Kok (2004 Preprint quant-ph/0408040). We show how to entangle such sources with photon qubits, which may be encoded in the dual-rail, polarization or time-bin degrees of freedom. We subsequently demonstrate how projective measurements of the matter qubits can be used to create entangled states of the photons alone. The state of the matter qubits is inherited by the generated photons. Since the entangling operation can be used to generate cluster states of matter qubits for quantum computing, our procedure enables us to create any (entangled) photonic quantum state that can be written as the outcome of a quantum computer.","PeriodicalId":87441,"journal":{"name":"Journal of optics. B, Quantum and semiclassical optics : journal of the European Optical Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2005-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1088/1464-4266/7/7/006","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60919205","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: 5
Phase space tomography of classical and nonclassical vibrational states of atoms in an optical lattice 光学晶格中原子经典和非经典振动态的相空间层析成像
Journal of optics. B, Quantum and semiclassical optics : journal of the European Optical Society Pub Date : 2005-06-16 DOI: 10.1088/1464-4266/7/12/037
J. F. Kanem, S. Maneshi, S. Myrskog, Aephraim M. Steinberg
{"title":"Phase space tomography of classical and nonclassical vibrational states of atoms in an optical lattice","authors":"J. F. Kanem, S. Maneshi, S. Myrskog, Aephraim M. Steinberg","doi":"10.1088/1464-4266/7/12/037","DOIUrl":"https://doi.org/10.1088/1464-4266/7/12/037","url":null,"abstract":"Atoms trapped in an optical lattice have long been a system of interest in the atomic, molecular and optical community, and in recent years much study has been devoted to both short- and long-range coherence in this system, as well as to its possible applications to quantum information processing. Here we demonstrate for the first time a complete determination of the quantum phase space distributions for an ensemble of 85Rb atoms in such a lattice, including a negative Wigner function for atoms in an inverted state.","PeriodicalId":87441,"journal":{"name":"Journal of optics. B, Quantum and semiclassical optics : journal of the European Optical Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2005-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1088/1464-4266/7/12/037","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60915566","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: 11
Efficient optical quantum information processing 高效的光量子信息处理
Journal of optics. B, Quantum and semiclassical optics : journal of the European Optical Society Pub Date : 2005-06-15 DOI: 10.1088/1464-4266/7/7/002
William J. Munro, K. Nemoto, T. P. Spiller, Sean D. Barrett, P. Kok, R. Beausoleil
{"title":"Efficient optical quantum information processing","authors":"William J. Munro, K. Nemoto, T. P. Spiller, Sean D. Barrett, P. Kok, R. Beausoleil","doi":"10.1088/1464-4266/7/7/002","DOIUrl":"https://doi.org/10.1088/1464-4266/7/7/002","url":null,"abstract":"Quantum information offers the promise of being able to perform certain communication and computation tasks that cannot be done with conventional information technology (IT). Optical quantum information processing (QIP) holds particular appeal, since it offers the prospect of communicating and computing with the same type of qubit. Linear optical techniques have been shown to be scalable, but the corresponding quantum computing circuits need many auxiliary resources. Here we present an alternative approach to optical QIP, based on the use of weak cross-Kerr nonlinearities and homodyne measurements. We show how this approach provides the fundamental building blocks for highly efficient non-absorbing single photon number resolving detectors, two qubit parity detectors, Bell state measurements and finally near deterministic control-not (CNOT) gates. These are essential QIP devices.","PeriodicalId":87441,"journal":{"name":"Journal of optics. B, Quantum and semiclassical optics : journal of the European Optical Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2005-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1088/1464-4266/7/7/002","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60918642","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: 60
Squeezed Fock state by inconclusive photon subtraction 用不确定的光子减法压缩Fock态
Journal of optics. B, Quantum and semiclassical optics : journal of the European Optical Society Pub Date : 2005-06-14 DOI: 10.1088/1464-4266/7/12/025
S. Olivares, M. Paris
{"title":"Squeezed Fock state by inconclusive photon subtraction","authors":"S. Olivares, M. Paris","doi":"10.1088/1464-4266/7/12/025","DOIUrl":"https://doi.org/10.1088/1464-4266/7/12/025","url":null,"abstract":"We analyse in detail the properties of the conditional state recently obtained by Wenger et al (2004 Phys. Rev. Lett. 92 153601) by means of inconclusive photon subtraction (IPS) from a squeezed vacuum state . The IPS process can be characterized by two parameters: the IPS transmissivity τ and the photodetection quantum efficiency η. We found that the conditional state approaches the squeezed Fock state when , i.e., in the limit of single-photon subtraction. For nonunit IPS transmissivity and nonunit quantum efficiency, the conditional state remains close to the target state, i.e., shows a high fidelity, as long as the squeezing parameter is not too large. The purity and the nonclassicality of the conditional state are also investigated and a nonclassicality threshold on the IPS parameters is derived.","PeriodicalId":87441,"journal":{"name":"Journal of optics. B, Quantum and semiclassical optics : journal of the European Optical Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2005-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1088/1464-4266/7/12/025","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60915159","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: 35
Conditions for spin squeezing in a cold87Rb ensemble 冷87rb系综中自旋压缩的条件
Journal of optics. B, Quantum and semiclassical optics : journal of the European Optical Society Pub Date : 2005-06-10 DOI: 10.1088/1464-4266/7/12/016
S. R. D. Echaniz, M. Mitchell, M. Kubasik, M. Koschorreck, H. Crepaz, J. Eschner, E. S. P. Icfo, Barcelona, Spain., Nbi, Copenhagen, Denmark.
{"title":"Conditions for spin squeezing in a cold87Rb ensemble","authors":"S. R. D. Echaniz, M. Mitchell, M. Kubasik, M. Koschorreck, H. Crepaz, J. Eschner, E. S. P. Icfo, Barcelona, Spain., Nbi, Copenhagen, Denmark.","doi":"10.1088/1464-4266/7/12/016","DOIUrl":"https://doi.org/10.1088/1464-4266/7/12/016","url":null,"abstract":"We study the conditions for generating spin squeezing via a quantum non-demolition measurement in an ensemble of cold87Rb atoms. By considering the interaction of atoms in the 5S1/2(F = 1) ground state with probe light tuned near the D2 transition, we show that, for large detunings, this system is equivalent to a spin-1/2 system when suitable Zeeman substates and quantum operators are used to define a pseudo-spin. The degree of squeezing is derived for the rubidium system in the presence of scattering causing decoherence and loss. We describe how the system can decohere and lose atoms, and predict as much as 75% spin squeezing for atomic densities typical of optical dipole traps.","PeriodicalId":87441,"journal":{"name":"Journal of optics. B, Quantum and semiclassical optics : journal of the European Optical Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2005-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1088/1464-4266/7/12/016","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60914713","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: 37
Minimum error discrimination of Pauli channels 泡利信道最小误差判别
Journal of optics. B, Quantum and semiclassical optics : journal of the European Optical Society Pub Date : 2005-06-09 DOI: 10.1088/1464-4266/7/10/018
M. Sacchi
{"title":"Minimum error discrimination of Pauli channels","authors":"M. Sacchi","doi":"10.1088/1464-4266/7/10/018","DOIUrl":"https://doi.org/10.1088/1464-4266/7/10/018","url":null,"abstract":"We solve the problem of discriminating with minimum error probability two given Pauli channels. We show that, unlike in the case of discrimination between unitary transformations, the use of entanglement with an ancillary system can strictly improve the discrimination, and any maximally entangled state allows one to achieve the optimal discrimination. We also provide a simple necessary and sufficient condition in terms of the structure of the channels for which the ultimate minimum error probability can be achieved without entanglement assistance. When such a condition is satisfied, the optimal input state is simply an eigenstate of one of the Pauli matrices.","PeriodicalId":87441,"journal":{"name":"Journal of optics. B, Quantum and semiclassical optics : journal of the European Optical Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2005-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1088/1464-4266/7/10/018","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60911809","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: 21
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