陆朝阳
博士 教授 博士生导师
中国科学技术大学上海研究院 量子物理与量子信息研究部
长期致力于面向实用化的量子信息技术研究
个性化签名
- 姓名:陆朝阳
- 目前身份:在职研究人员
- 担任导师情况:博士生导师
- 学位:博士
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学术头衔:
- 职称:高级-教授
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学科领域:
通信技术
- 研究兴趣:长期致力于面向实用化的量子信息技术研究
陆朝阳,1982年12月出生浙江东阳,剑桥大学物理学博士,中国科学技术大学教授,九三学社中央青年工作委员会副主任,全国青联常委,安徽省政协委员,上海市青联副主席。
2011年入选剑桥大学丘吉尔学院Fellow,2012年获得首批国家自然科学优秀青年基金,2014年获得香港求是杰出青年学者奖,2015年获得国家自然科学一等奖,2016年被《自然》评为“中国科学之星”,并入选美国光学学会会士,2017年获得中国青年五四奖章、欧洲物理学会菲涅尔奖、TR35中国科技创新青年,2018年获得中科院青年科学家奖,2019年获得中国物理学会黄昆半导体物理奖、科学探索奖、仁科芳雄亚洲奖、国际应用和纯物理协会(IUPAP-ICO)光学青年科学家奖。2020年,陆朝阳被授予美国光学学会颁发的阿道夫隆奖章(Adolph Lomb Medal),这是该奖章设立80年来中国科学家获奖。
自然子刊曾专门报道研究小组培养学生成功案例,培养的学生多名已经成为教授、特任研究员、海外顶尖科研机构博士后,多位学生获得香港求是杰出青年学者奖、国家优青、全国青少年创新奖、Light conference光学未来之星、研究生国家奖、求是奖、院长特别奖等等。
现任国际量子通信、测量与计算学会(QCMC)执委会委员、墨子量子基金会秘书长、Quantum-2020会议主席、美国光学学会量子计算和通信技术组主任、Science Bulletin期刊副主编、英国物理学会Quantum Science and Technology期刊编委、中国激光杂志社青年编辑委员会主任、iScience期刊编委、Advanced Quantum Technology期刊编委、Advanced Photonics期刊编委等。
陆朝阳长期致力于面向实用化的量子信息技术研究,在包括《自然》和《科学》9篇、《自然》子刊11篇、《美国科学院院刊》4篇、《物理评论快报》38篇等国际顶级学术期刊发表论文98篇,被引用11000余次。
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51
【期刊论文】Quantum Interference between Light Sources Separated by 150 Million Kilometers
Phys. Rev. Lett.,2019,123(8):080401
2019年08月21日
We report an experiment to test quantum interference, entanglement, and nonlocality using two dissimilar photon sources, the Sun and a semiconductor quantum dot on the Earth, which are separated by ∼150 million kilometers. By making the otherwise vastly distinct photons indistinguishable in all degrees of freedom, we observe time-resolved two-photon quantum interference with a raw visibility of 0.796(17), well above the 0.5 classical limit, providing unambiguous evidence of the quantum nature of thermal light. Further, using the photons with no common history, we demonstrate postselected two-photon entanglement with a state fidelity of 0.826(24) and a violation of Bell inequality by 2.20(6). The experiment can be further extended to a larger scale using photons from distant stars and open a new route to quantum optics experiments at an astronomical scale.
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【期刊论文】Quantum Teleportation in High Dimensions
Phys. Rev. Lett.,2019,123(7):070505
2019年08月15日
Quantum teleportation allows a “disembodied” transmission of unknown quantum states between distant quantum systems. Yet, all teleportation experiments to date were limited to a two-dimensional subspace of quantized multiple levels of the quantum systems. Here, we propose a scheme for teleportation of arbitrarily high-dimensional photonic quantum states and demonstrate an example of teleporting a qutrit. Measurements over a complete set of 12 qutrit states in mutually unbiased bases yield a teleportation fidelity of 0.75(1), which is well above both the optimal single-copy qutrit state-estimation limit of 1/2 and maximal qubit-qutrit overlap of 2/3, thus confirming a genuine and nonclassical three-dimensional teleportation. Our work will enable advanced quantum technologies in high dimensions, since teleportation plays a central role in quantum repeaters and quantum networks.
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【期刊论文】Towards optimal single-photon sources from polarized microcavities
Nature Photonics volume ,2019,13():770–775
2019年08月05日
An optimal single-photon source should deterministically deliver one, and only one, photon at a time, with no trade-off between the source’s efficiency and the photon indistinguishability. However, all reported solid-state sources of indistinguishable single photons had to rely on polarization filtering, which reduced the efficiency by 50%, fundamentally limiting the scaling of photonic quantum technologies. Here, we overcome this long-standing challenge by coherently driving quantum dots deterministically coupled to polarization-selective Purcell microcavities. We present two examples: narrowband, elliptical micropillars and broadband, elliptical Bragg gratings. A polarization-orthogonal excitation–collection scheme is designed to minimize the polarization filtering loss under resonant excitation. We demonstrate a polarized single-photon efficiency of 0.60 ± 0.02 (0.56 ± 0.02), a single-photon purity of 0.975 ± 0.005 (0.991 ± 0.003) and an indistinguishability of 0.975 ± 0.006 (0.951 ± 0.005) for the micropillar (Bragg grating) device. Our work provides promising solutions for truly optimal single-photon sources combining near-unity indistinguishability and near-unity system efficiency simultaneously.
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【期刊论文】Coherently driving a single quantum two-level system with dichromatic laser pulses
Nature Physics ,2019,15():941–946
2019年07月15日
The excitation of individual two-level quantum systems using an electromagnetic field is an elementary tool of quantum optics, with widespread applications across quantum technologies. The efficient excitation of a single two-level system usually requires the driving field to be at the same frequency as the transition between the two quantum levels. However, in solid-state implementations, the scattered laser light can dominate over the single photons emitted by the two-level system, imposing a challenge for single-photon sources. Here, we propose a background-free method for the coherent excitation and control of a two-level quantum system using a phase-locked dichromatic electromagnetic field with no spectral overlap with the optical transition. We demonstrate this method experimentally by stimulating single-photon emission from a single quantum dot embedded in a micropillar, reaching single-photon purity of 0.988(1) and indistinguishability of 0.962(6). The phase-coherent nature of our two-colour excitation scheme is demonstrated by the dependence of the resonance fluorescence intensity on the relative phase between the two pulses. Our two-colour excitation method represents an additional and useful tool for the study of atom–photon interaction, and the generation of spectrally isolated indistinguishable single photons.
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【期刊论文】Compatibility of causal hidden-variable theories with a delayed-choice experiment
Phys. Rev. A ,2019,100(1):012114
2019年07月15日
Wheeler's delayed-choice experiment investigates the indeterminacy of wave-particle duality and the role played by the measurement apparatus in quantum theory. Due to the inconsistency with classical physics, it has been generally believed that it is not possible to reproduce the delayed-choice experiment using a hidden-variable theory. Recently, it was shown that Wheeler's delayed-choice experiment can be explained by a causal two-dimensional hidden-variable theory [R. Chaves, G. B. Lemos, and J. Pienaar, Phys. Rev. Lett. 120, 190401 (2018)]. Here, we carry out a delayed-choice experiment by using photon states that are spacelike separated and demonstrate that the experiment is consistent with quantum theory but inconsistent with any causal two-dimensional hidden-variable theory in a device-independent manner. This demonstrates that causality can be used to test quantum theory in a complementary way to the Bell and Leggett-Garg tests.
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【期刊论文】Emergence of classical objectivity of quantum Darwinism in a photonic quantum simulator
Science Bulletin,2019,64(9):580-585
2019年05月15日
Quantum-to-classical transition is a fundamental open question in physics frontier. Quantum decoherence theory points out that the inevitable interaction with environment is a sink carrying away quantum coherence, which is responsible for the suppression of quantum superposition in open quantum system. Recently, quantum Darwinism theory further extends the role of environment, serving as communication channel, to explain the classical objectivity emerging in quantum measurement process. Here, we used a six-photon quantum simulator to investigate classical and quantum information proliferation in quantum Darwinism process. In the simulation, many environmental photons are scattered from an observed quantum system and they are collected and used to infer the system’s state. We observed redundancy of system’s classical information and suppression of quantum correlation in the fragments of environmental photons. Our results experimentally show that the classical objectivity of quantum system can be established through quantum Darwinism mechanism.
Quantum measurement Quantum Darwinism Hovelo bound Quantum discord Single photons
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【期刊论文】Experimental Gaussian Boson sampling
Science Bulletin,2019,64(8):511-515
2019年04月30日
Gaussian Boson sampling (GBS) provides a highly efficient approach to make use of squeezed states from parametric down-conversion to solve a classically hard-to-solve sampling problem. The GBS protocol not only significantly enhances the photon generation probability, compared to standard Boson sampling with single photon Fock states, but also links to potential applications such as dense subgraph problems and molecular vibronic spectra. Here, we report the first experimental demonstration of GBS using squeezed-state sources with simultaneously high photon indistinguishability and collection efficiency. We implement and validate 3-, 4- and 5-photon GBS with high sampling rates of 832, 163 and 23 kHz, respectively, which is more than 4.4, 12.0, and 29.5 times faster than the previous experiments. Further, we observe a quantum speed-up on a NP-hard optimization problem when comparing with simulated thermal sampler and uniform sampler.
Quantum information Boson sampling Gaussian Boson sampling Squeezed state Quantum advantage Quantum approximate optimization
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Phys. Rev. Lett.,2019,122(11):113602
2019年03月22日
An outstanding goal in quantum optics and scalable photonic quantum technology is to develop a source that each time emits one and only one entangled photon pair with simultaneously high entanglement fidelity, extraction efficiency, and photon indistinguishability. By coherent two-photon excitation of a single InGaAs quantum dot coupled to a circular Bragg grating bull’s-eye cavity with a broadband high Purcell factor of up to 11.3, we generate entangled photon pairs with a state fidelity of 0.90(1), pair generation rate of 0.59(1), pair extraction efficiency of 0.62(6), and photon indistinguishability of 0.90(1) simultaneously. Our work will open up many applications in high-efficiency multiphoton experiments and solid-state quantum repeaters.
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【期刊论文】Genuine 12-Qubit Entanglement on a Superconducting Quantum Processor
Phys. Rev. Lett. ,2019,122(11):110501
2019年03月20日
We report the preparation and verification of a genuine 12-qubit entanglement in a superconducting processor. The processor that we designed and fabricated has qubits lying on a 1D chain with relaxation times ranging from 29.6 to 54.6 μs. The fidelity of the 12-qubit entanglement was measured to be above 0.5544±0.0025, exceeding the genuine multipartite entanglement threshold by 21 statistical standard deviations. After thermal cycling, the 12-qubit state fidelity was further improved to be above 0.707±0.008. Our entangling circuit to generate linear cluster states is depth invariant in the number of qubits and uses single- and double-qubit gates instead of collective interactions. Our results are a substantial step towards large-scale random circuit sampling and scalable measurement-based quantum computing.
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【期刊论文】Experimental demonstration of quantum pigeonhole paradox
PNAS,2019,116(5):1549-1552
2019年01月29日
We experimentally demonstrate that when three single photons transmit through two polarization channels, in a well-defined pre- and postselected ensemble, there are no two photons in the same polarization channel by weak-strength measurement, a counterintuitive quantum counting effect called the quantum pigeonhole paradox. We further show that this effect breaks down in second-order measurement. These results indicate the existence of the quantum pigeonhole paradox and its operating regime.
single photonsquantum paradoxweak measurement
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