Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session J02: Advances in AMO Quantum Information and Technologies |
Hide Abstracts |
Sponsoring Units: DQI DAMOP Chair: Alejandra Collopy, National Institute of Standards and Technology Boulder Room: 105 |
Tuesday, March 3, 2020 2:30PM - 2:42PM |
J02.00001: Rydberg physics for quantum computing in arrays of neutral atom qubits Jonathan King, Alexander Papageorge, Sabrina Hong, Remy Notermans, Brian Lester, Stanimir Kondov, Krish Kotru, Mickey McDonald, Robin Coxe, Prasahnt Sivarajah, Benjamin Bloom Ultracold neutral atoms have recently emerged as a scalable quantum computing platform. Their long coherence times and parallel coherent control portend the realization of high-fidelity quantum operations on large arrays of qubits. Interactions between neutral atoms in Rydberg states provide a means to 2-qubit and multi-qubit gates. Understanding the energy level structure of Rydberg atoms and their interactions are a necessary prerequisite to designing gate schemes. To this end we discuss Rydberg interactions for quantum computing with trapped single atoms, including simulations of the full Hilbert space relevant to 2-qubit gates. |
Tuesday, March 3, 2020 2:42PM - 2:54PM |
J02.00002: Robustness and sensitivity to imperfections in the dynamics of general observables within near-term quantum simulators Pablo Poggi, Nathan Lysne, Kevin Kuper, Poul Sterndorff Jessen, Ivan Deutsch We analyze the robustness of analog quantum simulators in the presence of weak perturbations. To this end, we focus on the dynamics of expectation values for generic observables and study the error arising from the imperfect operation of the device. We show that the properties of the error depend crucially on the observable considered as output of the simulator and we demostrate how even a low-fidelity quantum simulation is still able to reproduce the dynamics of other observables with a small relative error. To explain this, we define the observable purity, which characterizes the magnitude of the support of the observable in Hilbert space, and analytically show that these imperfect devices are able to reproduce the dynamics of low-purity observables (such as collective operators like the magnetization in a spin system) accurately, while the error in the expectation value of high-purity observables (such as projectors onto pure states) are much larger on average. We demonstrate our findings in a state-of-the-art 16-dimensional quantum simulator where, without assuming any particular error model, we observe this predicted behavior. This shows that these features are generic for a highly accurate device where we expect imperfections to be small. |
Tuesday, March 3, 2020 2:54PM - 3:06PM |
J02.00003: Sampling complexity of interacting bosonic random walkers on a lattice Gopikrishnan Muraleedharan, Sayonee Ray, Adrian Chapman, Akimasa Miyake, Ivan Deutsch A central goal for modern quantum information science is to demonstrate computational speedup for experimentally feasible architectures in the noisy intermediate-scale regime. In a previous work, we studied this problem in the context of simulating boson sampling by noninteracting bosonic atoms on a one-dimensional lattice [1]. We extend these results to include Bose-Hubbard-type interactions. In the presence of weak interactions, we show that the output-sampling distribution is close to that of a free-boson sampler in the total variational distance. We calculate the scaling of the interaction-strength such that this total variational distance is bounded by a constant, demonstrating a regime where the sampling complexity is equivalent to that of the corresponding boson sampler. We close with some outlook for the possibility of applying worst-to-average-case reduction tools to extend these results beyond the perturbative regime. |
Tuesday, March 3, 2020 3:06PM - 3:18PM |
J02.00004: Quantum amplification of boson-mediated interactions Shaun Burd, Raghavendra Srinivas, Hannah M Knaack, Wenchao Ge, Andrew C Wilson, David J Wineland, Dietrich Leibfried, John Jacob Bollinger, David Thomas Charles Allcock, Daniel H Slichter Strong and precisely controlled interactions between quantum objects are essential for emerging technologies such as quantum information processing, simulation, and sensing. A well-established paradigm for coupling otherwise weakly interacting quantum objects is to use auxiliary quantum particles, typically bosons, to mediate interactions, for example photon-mediated interactions between atoms or superconducting qubits, and phonon-mediated interactions between trapped ions. General methods for amplifying these interactions through parametric driving of the boson channel have been proposed for a variety of quantum platforms, but an experimental demonstration has yet to be realized. Here we experimentally demonstrate the amplification of a boson-mediated interaction between two trapped-ion qubits by parametrically modulating the confining potential of the trap. The stronger interaction enables a 3.3-fold reduction in the time required to implement an entangling gate between the two qubits. Our method can be applied wherever parametric modulation of the boson channel is possible, enabling its use in a variety of quantum platforms to explore new parameter regimes and for enhanced quantum information processing. |
Tuesday, March 3, 2020 3:18PM - 3:30PM |
J02.00005: TDDFT potential inversion applied to spin systems on noisy quantum computers James Brown, Jun Yang, James D Whitfield One route to numerically propagating quantum systems is time-dependent density functional theory (TDDFT). We recently introduced a newly developed solver[arXiv:1904.10958] for the scalar time-dependent Kohn-Sham potential using a grid-like basis of Sinc functions. In this talk, we discuss the application of this method to describing interacting spin systems (which can be implemented readily on quantum computers) as a non-interacting Kohn-Sham system. The method's robustness when used in conjunction with current noisy quantum devices is discussed. |
Tuesday, March 3, 2020 3:30PM - 3:42PM |
J02.00006: Electric field in a two-dimensional time-multiplexed photonic quantum walk Hamidreza Chalabi, Sabyasachi Barik, Sunil Mittal, THOMAS E. MURPHY, Mohammad Hafezi, Edo Waks It is of fundamental importance to control the evolution of a photonic quantum walk for conducting various quantum simulations. However, due to the lack of charge, photons are indifferent to applied electric fields, which limits our ability to control photonic quantum walks. One approach to mimic the effect of electric fields is through the use of synthetic gauge fields. In this presentation, we show the creation of a uniform effective electric field using a linearly time-varying gauge field in a time-multiplexed two-dimensional quantum walk. In this platform, varied lengths of optical fibers create time delays and the gauge fields are implemented through phase modulations. We demonstrate that the generated electric field leads to Bloch oscillations that enable revival of the quantum walker state. By measuring the probability of the revival, we show good agreement between the observed values and the theoretically predicted results. We also demonstrate the possibility of waveguiding quantum walkers by applying an inhomogeneous electric field. |
Tuesday, March 3, 2020 3:42PM - 3:54PM |
J02.00007: Experimental few-copy multipartite entanglement detection Valeria Saggio, Aleksandra Dimić, Chiara Greganti, Lee Arthur Rozema, Philip Walther, Borivoje Dakic The reliable verification of quantum entanglement is an essential task to scale up quantum technologies. Although progressively more efficient techniques have been developed, most of these focus solely on minimizing the number of measurement settings. Recently, a single-shot probabilistic method was proposed [1], wherein it was shown that even a single detection event can be sufficient to verify if a state exhibits entanglement. In our work [2] we extend this theoretical approach by showing that any entanglement witness can be translated into this probabilistic framework. To prove our findings, we report the experimental entanglement verification in a photonic six-qubit cluster state. We find that the presence of entanglement can be certified with at least 99.74% by using only 20 copies of the state, and that genuine six-qubit entanglement is verified with at least 99% confidence by using 112 copies of state. This novel method entails a significant reduction of resources, promising a great impact in future experiments where an efficient and resource saving approach will be essential for entanglement verification problems in multi-qubit states. |
Tuesday, March 3, 2020 3:54PM - 4:06PM |
J02.00008: Deterministic Logic Gates for Photonic Qubits Mikkel Heuck, Kurt Jacobs, Dirk R. Englund Quantum logic gates operating on qubits encoded in photons are highly desirable for processing quantum information as it is being transmitted through quantum networks. However, the difficulty of enabling sufficiently strong interactions between photons has hindered their experimental realization. Additionally, the multi-mode nature of finite-duration photon wave packets limits the gate fidelity if photons interact while travelling. We propose a method that converts travelling continuous-mode photons into quasi-single mode fields by absorbing them into cavities. This is enabled by strong classical control fields that perform the necessary re-distribution of photon frequency-modes. Letting the photons interact while occupying modes of a cavity with high quality factor and low mode-volume achieves a large interaction strength and simultaneously avoids gate fidelity degradations. We consider nonlinear interactions due to Χ^{(2)}, Χ^{(3)}, and atom-like emitters. Our numerical results show that high-fidelity gates are possible with near-term improvements in nanofabrication. |
Tuesday, March 3, 2020 4:06PM - 4:18PM |
J02.00009: Accelerating quantum optics experiments using statistical learning Cristian Cortes, Sushovit Adhikari, Xuedan Ma, Stephen K Gray Quantum optics experiments, involving the measurement of low-probability photon events, are known to be extremely time-consuming. In this talk, we present a new methodology for accelerating such experiments using simple statistical learning techniques such as Bayesian maximum a posteriori estimation based on few-shot data. We show it is possible to reconstruct time dependent data using a small number of detected photons, allowing for fast estimates in under a minute, and providing a one-to-two order of magnitude speed up in data acquisition time. We test our approach using real experimental data to retrieve the $G^2\tau)$ time trace for thermal light emitted by a Neon light source as well as anti-bunched light emitted by a quantum dot driven with periodic laser pulses. We also show, through numerical simulations, that our approach can be used to accelerate sub-diffraction image reconstruction based on $G^2(\tau)$ coincidence measurements. The proposed methodology has the potential to impact the scientific discovery process across a multitude of domains. |
Tuesday, March 3, 2020 4:18PM - 4:30PM |
J02.00010: Machine Learning Topological Phases with a Solid-State Quantum Simulator Wenqian Lian, Shengtao Wang, Sirui Lu, Wengang Zhang, Xiaolong Ouyang, Xin Wang, Xianzhi Huang, Dong-Ling Deng, Luming Duan We report an experimental demonstration of a machine learning approach to identify exotic topological phases, with a focus on the three-dimensional chiral topological insulators. We show that the convolutional neural networks—a class of deep feed-forward artificial neural networks with widespread applications in machine learning—can be trained to successfully identify different topological phases protected by chiral symmetry from experimental raw data generated with a solid-state quantum simulator. Our results explicitly showcase the exceptional power of machine learning in the experimental detection of topological phases, which paves a way to study rich topological phenomena with the machine learning toolbox. |
Tuesday, March 3, 2020 4:30PM - 4:42PM |
J02.00011: Heralding High Fidelity Entanglement Between Imperfect Artificial Atoms Hyeongrak Choi, Dirk R. Englund Color centers in diamond have emerged as excellent candidates for quantum networks. However, despite their stable optical properties, residual spectral dephasing and diffusion still limit the achievable fidelity of heralded entanglement. Here, we address this problem through a new single-photon entanglement protocol that uses detuned optical coupling to spin-dependent optical transitions. Our calculations include entanglement distillation and are compared to other leading entanglement protocols. Estimates based on present-day technology indicate that this protocol enables entanglement fidelity in excess of 99% for leading diamond color centers. |
Tuesday, March 3, 2020 4:42PM - 4:54PM |
J02.00012: A Dielectric Antenna for Quantum Emitter Interfaces Linsen Li, Hyeongrak Choi, Dirk R. Englund Color centers in diamond have shown long spin coherence time and stable optical properties as a promising system for large scale quantum information processing. Collecting single photons from emitters with high efficiency can significantly boost the entanglement generation rate of remote quantum memories. Here, we propose a method to design a dielectric antenna for low numerical aperture optics systematically. Our simulation results show that the design is robust in the presence of fabrication imperfection. The dielectric antenna design enables efficient interfaces to closely packed arrays of quantum memories for multiplexed quantum repeaters, arrayed quantum sensors, and modular quantum computers. |
Tuesday, March 3, 2020 4:54PM - 5:06PM |
J02.00013: Sub-kilohertz optical homogeneous linewidth in transparent Er^{3+}:Y_{2}O_{3} ceramics Rikuto Fukumori, Yizhong Huang, Jun Yang, Haitao Zhang, Tian Zhong Global quantum networks require quantum memories with long coherence times to act as quantum repeaters connected by optical fibers. Erbium doped solid-state systems are good candidates for such memories, as they exhibit long coherence lifetimes and an optical transition in the low-loss telecom band. We measure an optical homogeneous linewidth of 580 Hz in transparent Er^{3+}:Y_{2}O_{3} ceramics at millikelvin temperatures, the narrowest so far in rare-earth doped ceramics, and suppressed spectral diffusion at 300 Hz/decade. Temperature, field, and time dependence studies of homogeneous linewidth reveal the limiting dephasing mechanisms as tunneling two-level systems and superhyperfine interactions between the electronic spins of erbium and nuclear spins of yttrium. These spectroscopic results put Er^{3+}:Y_{2}O_{3} ceramics as a promising candidate for telecommunication quantum memories. |
Tuesday, March 3, 2020 5:06PM - 5:18PM |
J02.00014: Cavity nano-optics with configurable interaction: room temperature strong coupling of single emitter Molly A. May, David Fialkow, Tong Wu, Kyoung-Duck Park, Haixu Leng, Jaron Kropp, Theodosia Gougousi, Philippe Lalanne, Matthew A Pelton, Markus B. Raschke Quantum state control of two-level emitters is fundamental for many information processing, metrology, and sensing applications. However, quantum-coherent photonic control of solid-state emitters has traditionally been limited to cryogenic environments, which are not compatible with implementation in scalable, broadly distributed technologies. In contrast, plasmonic nano-cavities with deep sub-wavelength mode volumes have recently emerged as a path towards room temperature quantum state hybridization and control. Here we establish plasmonic tip-enhanced strong coupling (TESC) with a configurable nano-tip cavity to modulate and control the cavity-emitter interaction with sub-nanometer precision, quantify coupling strength exceeding ~160 meV, at mode volumes of < 10^{-6} λ^{3}, augmented by theoretical modeling. Based on this work, we provide a perspective for nano-cavity optics as a promising tool for room temperature control of quantum coherent interactions that could spark new innovations in fields from quantum information and quantum sensing to quantum chemistry and molecular opto-mechanics. |
Tuesday, March 3, 2020 5:18PM - 5:30PM |
J02.00015: A cavity enhanced spin-photon interface for NV centers in a quantum network Matthew Weaver, Maximilian Ruf, Matteo Pasini, Martin Eschen, Ronald Hanson Fast entanglement generation between remote nodes is the foundation for quantum networks. Experiments with Nitrogen Vacancy (NV) centers in bulk diamond have made promising progress towards such a network, because of their long spin coherence, narrow optical transitions and accessible nuclear spin memories. However, these demonstrations are currently limited by low emission into the zero phonon line and low collection efficiency. To boost emission and collection, we construct a tunable Fabry-Pérot cavity around NV centers in a diamond membrane. We verify the good optical properties of NV centers in membranes and observe the characteristic lifetime reduction from Purcell enhancement of the zero phonon line. These measurements progress towards an NV node for networks with two orders of magnitude faster entanglement rates. |
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700