Bulletin of the American Physical Society
APS March Meeting 2017
Volume 62, Number 4
Monday–Friday, March 13–17, 2017; New Orleans, Louisiana
Session X13: Quantum Information Science with Solid-State Defects, Photons, and Atoms |
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Sponsoring Units: DAMOP GQI Chair: Tongcang Li, Purdue University Room: 272 |
Friday, March 17, 2017 8:00AM - 8:12AM |
X13.00001: Complete Quantum Control of a Single Silicon-Vacancy Center in a Diamond Nanopillar Jingyuan Linda Zhang, Konstantinos G. Lagoudakis, Yan-Kai Tzeng, Constantin Dory, Marina Radulaski, Yousif Kelaita, Zhi-Xun Shen, Nicholas A. Melosh, Steven Chu, Jelena Vuckovic Coherent quantum control of a quantum bit (qubit) is an important step towards its use in a quantum network. SiV$^{-}$ center in diamond offers excellent physical qualities such as low inhomogeneous broadening, fast photon emission, and a large Debye-Waller factor, while the fast spin manipulation and techniques to extend the spin coherence time are under active investigation. Here, we demonstrate full coherent control over the state of a single SiV$^{-}$ center in a diamond nanopillar using ultrafast optical pulses. The high quality of the chemical vapor deposition grown SiV$^{-}$ centers allows us to coherently manipulate and quasi-resonantly read out the state of the single SiV$^{-}$ center. Moreover, the SiV$^{-}$ centers being coherently controlled are integrated into diamond nanopillar arrays in a site-controlled, individually addressable manner with high yield, low strain, and high spectral stability, which paves the way for scalable on chip optically accessible quantum system in a quantum photonic network. [Preview Abstract] |
Friday, March 17, 2017 8:12AM - 8:24AM |
X13.00002: Coherent control of the silicon-vacancy spin in diamond Benjamin Pingault, David Jarausch, Christian Hepp, Lina Klintberg, Jonas Becker, Matthew Markham, Christoph Becher, Mete Atature Spin impurities in diamond have emerged as a promising building block in a wide range of solid-state-based quantum technologies. The negatively charged silicon-vacancy centre combines the advantages of the high quality of its photonic properties with a ground state spin which can be read out optically. However, for this spin to be usable in a quantum network, full quantum control is essential. Here, we report the measurement of optically detected magnetic resonance and coherent control of a single silicon-vacancy centre spin with microwave field. Using Ramsey interferometry, we directly measure a spin coherence time exceeding 100 ns at 4 K. Furthermore, we show that this coherence time is consistent with dephasing of the spin arising from phonon-mediated excitation to the upper orbital branch of the ground state. Our results make the spin a usable resource to establish the silicon-vacancy centre as a spin-photon interface. [Preview Abstract] |
Friday, March 17, 2017 8:24AM - 8:36AM |
X13.00003: Nanoscale Engineering of Closely-Spaced Electronic Spins in Diamond Diego Scarabelli, Matt Trusheim, Ophir Gaathon, Dirk Englund, Shalom Wind Spin systems in solid-state have been intensively investigated as an outstanding pathway towards quantum information processing. The negatively charged nitrogen vacancy (NV) center in diamond stands out because of its optically addressable electron spin, which shows long coherence time and viable initialization, manipulation and read-out at room temperature. In order to enable the use of this system for quantum information technology it's crucial to develop a procedure to deterministically engineer single artificial NV centers with nanometric positioning control and integrate them within an optoelectronic device. In this work, we demonstrate a method for chip-scale fabrication of arrays of single NV centers with record spatial localization of about 10 nm in all three dimensions and controllable inter-NV spacing as small as 40 nm, which approaches the length scale of strong dipolar coupling. Our approach uses masked implantation of nitrogen through nano-apertures in a thin gold film, patterned via electron-beam lithography and dry etching, which ensures excellent masking contrast for the implantation of 10 KeV nitrogen ions. We verified the position and spin properties of the resulting NVs through wide-field super-resolution optically detected magnetic resonance imaging. [Preview Abstract] |
Friday, March 17, 2017 8:36AM - 8:48AM |
X13.00004: Absorption spectrum of a pulse-driven quantum emitter Herbert F Fotso, Viatcheslav Dobrovitski Spectral diffusion, the process by which the emission of a quantum emitter uncontrollably drifts in time, is a major hurdle for implementing a scalable quantum network with solid-state qubits [1]. Recently, it has been demonstrated that this problem can be remedied with a periodic sequence of optical pulses, which can maintain the bulk of the emission at a set target frequency thus improving photon indistinguishability [2]. Extending this approach to the absorption-based schemes for long-range entanglement which attracted much interest lately [3], we study the absorption spectrum of a quantum emitter driven by such a periodic sequence of optical pulses with a finite detuning with respect to the emitter. We find that, for moderate values of the sequence period and of the detuning, the absorption spectrum has a lineshape with little dependence on the detuning. It features a pronounced peak of stimulated emission at the pulse frequency and equidistant satellite peaks with weights strongly suppressed away from the central peak. We describe the solution and the evolution of this absorption spectrum as a function time. [1] K.-M. Fu et al, PRL 103, 256404 (2009). [2] H. F. Fotso et al, PRL 116, 033603 (2016). [3] S. Yang et al., Nat. Photonics 10, 507 (2016). [Preview Abstract] |
Friday, March 17, 2017 8:48AM - 9:00AM |
X13.00005: An efficient quantum spin-photon interface in diamond for a quantum network~ Suzanne van Dam, Stefan Bogdanovic, Cristian Bonato, Madelaine Liddy, Bas Hensen, Lisanne Coenen, Anne-Marije Zwerver, Andreas Reiserer, Marko Loncar, Ronald Hanson In a future quantum network distant nodes will be connected via entanglement. Nitrogen-vacancy (NV) centers in diamond have developed into a building block for such a network. The current success probability of heralded entanglement generation is limited by the probability that the NV center emits a photon in the zero-phonon line, as well as by the photon collection efficiency from the diamond. We can address both by embedding the NV in a Fabry-Perot cavity at cryogenic temperatures, benefitting from Purcell enhancement and an improved collection efficiency. Here we report the latest results on such a system with a thin diamond membrane in a tunable fiber-based microcavity at cryogenic temperatures. This new quantum interface should enable significant speed-up in the remote entangling rate, and allow us to extend a quantum network over multiple nodes and longer distance. [Preview Abstract] |
Friday, March 17, 2017 9:00AM - 9:12AM |
X13.00006: An elementary quantum network using robust nuclear spin qubits in diamond Norbert Kalb, Andreas Reiserer, Peter Humphreys, Machiel Blok, Koen van Bemmelen, Daniel Twitchen, Matthew Markham, Tim Taminiau, Ronald Hanson Quantum registers containing multiple robust qubits can form the nodes of future quantum networks for computation and communication. Information storage within such nodes must be resilient to any type of local operation. Here we demonstrate multiple robust memories by employing five nuclear spins adjacent to a nitrogen-vacancy defect centre in diamond. We characterize the storage of quantum superpositions and their resilience to entangling attempts with the electron spin of the defect centre. The storage fidelity is found to be limited by the probabilistic electron spin reset after failed entangling attempts. Control over multiple memories is then utilized to encode states in decoherence protected subspaces with increased robustness. Furthermore we demonstrate memory control in two optically linked network nodes and characterize the storage capabilities of both memories in terms of the process fidelity with the identity. These results pave the way towards multi-qubit quantum algorithms in a remote network setting. [Preview Abstract] |
Friday, March 17, 2017 9:12AM - 9:24AM |
X13.00007: Modal loss analysis of spin-orbit transduction of entangled photonic qubit in special fibers Brian Kirby, Michael Brodsky, Nenad Bozinovic, Siddharth Ramachandran The ability to switch entanglement between different degrees of freedom of the same photon is essential for tying various quantum technologies into operational quantum networks. We report the reversible conversion of one photon in a pair of polarization entangled photons into an Orbital Angular Momentum (OAM) encoding. The photons are initially prepared using a conventional nonlinear scheme at 1550nm band, and are each routed into separate optical fibers. One photon propagates through single mode fiber, the other is sent through a specially designed vortex fiber, which supports OAM modes. Conversion from polarization to OAM and back is achieved using long-period gratings at each end of the vortex fiber. Using full state tomography, we find that our conversion procedure produces a photon pair that remains close to the initial state with fidelity of 0.95. Some loss in fidelity is a product of varying modal loss in the conversion process and temporal drifts during the tomography. We model these two loss mechanisms, and using parameters extracted from the data, are able fit the experimental results with a fidelity of 0.94-0.96. [Preview Abstract] |
Friday, March 17, 2017 9:24AM - 9:36AM |
X13.00008: Development and Characterization of Cavity-Enhanced Bright Parametric Down-Conversion Single-Photon Source Tailored To Match Frequency and Bandwidth of InAs Quantum Dots for Quantum Information Protocols Uttam Paudel, Jia Jun Wong, Alexander Burgers, Michael Goggin, Paul Kwiat, Duncan Steel Quantum~networks are an integral part of~many quantum information protocols where~information is transferred~between~distant stationary nodes, such as quantum dots, using flying qubits through two-photon interference measurement. A realistic quantum network could be composed of various different quantum nodes, necessitating highly customizable flying qubits to link such disparate sources. Spontaneous parametric down-conversion (SPDC) can be an excellent source of such customizable correlated photons. A cavity placed around an SPDC crystal acts as an active filter that not only narrows the bandwidth but also enhances the photon count rate. We have constructed such a cavity-enhanced parametric down-conversion source to interface with single photons emitted by InAs single quantum dots. In this talk I will present a realization of a high signal-to-noise ratio, heralded, single-mode, single-photon source to interface with quantum dots. I will give a detailed characterization of such a cavity-enhanced SPDC source and present our ongoing efforts to link the single photons with quantum dots. [Preview Abstract] |
Friday, March 17, 2017 9:36AM - 9:48AM |
X13.00009: Highly efficient two photon generation from a coherently pumped quantum dot embedded in a microcavity Jitendra Verma, Pradyumna Kumar Pathak We propose two schemes to realize a highly efficient solid-state source of photon pairs using four-wave mixing and stimulated Raman adiabatic passage in a single quantum dot embedded in a microcavity. A resonant continuous-wave laser applied between biexciton and exciton states and a pulsed laser applied between a ground state and exciton state are utilized to facilitate coherent pumping. We show in the case of four-wave mixing that, although the probability of generating two photons in a cavity mode is small without cavity damping, two-photon-resonant emission is enhanced by cavity damping within the strong-coupling regime. For strong continuous-wave laser, a single photon from a pulsed laser and two-photon-resonant transition through a strongly coupled cavity mode lead to a (1+2)-type Raman transition through the generated Autler-Townes doublet. We also discuss the spectrum of the generated photon pair and the photon-photon correlations in the generated photon pair. [Preview Abstract] |
Friday, March 17, 2017 9:48AM - 10:00AM |
X13.00010: Quantized Electromagnetic-Field Propagation in General Non-Local and Non-Stationary Dispersive and Absorbing Media Verne Jacobs Dynamical descriptions for the propagation of quantized electromagnetic fields, in the presence of environmental interactions, are systematically and self-consistently developed in the complimentary Schrödinger and Heisenberg pictures. An open-systems (non-equilibrium) quantum-electrodynamics description is thereby provided for electromagnetic-field propagation in general non-local and non-stationary dispersive and absorbing optical media, including a fundamental microscopic treatment of decoherence and relaxation processes due to environmental collisional and electromagnetic interactions. Particular interest is centered on entangled states and other non-classical states of electromagnetic fields, which may be created by non-linear electromagnetic interactions and detected by the measurement of various electromagnetic-field correlation functions. Accordingly, we present dynamical descriptions based on general forms of electromagnetic-field correlation functions involving both the electric-field and the magnetic-field components of the electromagnetic field, which are treated on an equal footing. [Preview Abstract] |
Friday, March 17, 2017 10:00AM - 10:12AM |
X13.00011: Spatial EPR entanglement in atomic vapor quantum memory Michal Parniak, Michal Dabrowski, Wojciech Wasilewski Spatially-structured quantum states of light are staring to play a key role in modern quantum science with the rapid development of single-photon sensitive cameras [1]. In particular, spatial degree of freedom holds a promise to enhance continous-variable quantum memories. Here we present the first demonstration of spatial entanglement between an atomic spin-wave and a photon [2] measured with an I-sCMOS camera. The system is realized in a warm atomic vapor quantum memory based on rubidium atoms immersed in inert buffer gas. In the experiment we create and characterize a 12-dimensional entangled state exhibiting quantum correlations between a photon and an atomic ensemble in position and momentum bases. This state allows us to demonstrate the Einstein-Podolsky-Rosen paradox in its original version [3], with an unprecedented delay time of 6 $\mu$s between generation of entanglement and detection of the atomic state.\newline \newline [1] R. Chrapkiewicz, M. Jachura, K. Banaszek, and W.Wasilewski, Nat. Photonics 10, 576 (2016).\newline [2] M. D\k{a}browski, M. Parniak and W. Wasilewski, "Einstein-Podolsky-Rosen Paradox in a Hybrid Bipartite System", arXiv:1607.05865 \newline [3] A. Einstein, B. Podolsky, and N. Rosen, Phys. Rev. 47, 777 (1935) [Preview Abstract] |
Friday, March 17, 2017 10:12AM - 10:24AM |
X13.00012: Generation and spatial mode optimization of squeezed vacuum field in hot Rb vapor Mi Zhang, Melissa Guidry, R. Nicholas Lanning, Zhihao Xiao, Jonathan P. Dowling, Irina Novikova, Eugeniy E. Mikhailov We study a squeezed vacuum field generated in hot Rb vapor via the polarization self-rotation effect. By propagating the strong laser beam through a vapor cell once, we were able to achieve a noise suppression of 2 dB below shot noise. Our previous experiments showed that the amount of observed squeezing may be limited by the imperfect mode match between the squeezed field and the local oscillator (LO) due to the excitement of higher order modes during the atom-light interaction. Here, we use a liquid-crystal-based spatial light modulator (SLM) to change the spatial mode of the pump or the LO and optimize the squeezing result. We demonstrate that optimization of the spatial modes can lead to higher detected squeezing in some conditions, which would be very useful for precision metrology and quantum memory applications. [Preview Abstract] |
Friday, March 17, 2017 10:24AM - 10:36AM |
X13.00013: Generating spin-entanglement between two spatially separated neutral atoms in optical tweezers Brian J. Lester, Mark O. Brown, Yiheng Lin, Randall J. Ball, Adam M. Kaufman, Leonid Isaev, Michael L. Wall, Ana Maria Rey, Cindy A. Regal The ability to fully control individual neutral atoms trapped in optical tweezers has provided exciting possibilities for encoding and propagating quantum information in small arrays of traps. In these systems, the quantum statistics of the particles can dramatically affect the particle dynamics and lead to coupling between the spin and motional degrees of freedom. For example, we have observed the generation of spin-entanglement between two $^{87}$Rb atoms undergoing spin-exchange due to an on-site contact interaction. Additionally, via postselection on the resulting spatial configuration, we show that noninteracting atoms can be probabilistically spin-entangled during tunneling of the atoms between the ground states of two optical tweezers. In this talk, I will detail our use of the optical tweezer platform to prepare arrays of indistinguishable atoms, imprint a desired initial spin configuration, and then take advantage of the quantum statistics of bosonic particles to generate and verify spin-entanglement between two $^{87}$Rb atoms. [Preview Abstract] |
Friday, March 17, 2017 10:36AM - 10:48AM |
X13.00014: Shortcuts to adiabaticity for accelerated quantum state transfer Alexandre Baksic, Hugo Ribeiro, Aashish A. Clerk Adiabatic transfer protocols are among the most powerful and interesting approaches to move quantum states between two different systems. While having many advantages, those schemes are necessarily slow, and hence can suffer from dissipation and noise in the target and/or source system.\\ In this talk, we present an approach that allows to operate a state transfer much faster, without suffering from non-adiabatic errors. The key idea is to work with a basis of dressed states whose very definition incorporates the matrix elements which give rise to non-adiabatic transitions [1]. By introducing additional control fields, we can ensure that the system ``rides" these new dressed states during the protocol, thus allowing for a fast high fidelity state transfer. We discuss a recent experimental implementation of these ideas in an NV-center $\Lambda$-system [2], as well as extensions to state transfer problems involving propagating states.\\ $[$1$]$ A. Baksic, H. Ribeiro, and A. A. Clerk, Phys. Rev. Lett. {\bf 116}, 230503 (2016).\\ $[$2$]$ B. B. Zhou, A. Baksic, H. Ribeiro, C. G. Yale, F. J. Heremans, P. C. Jerger, A. Auer, G. Burkard, A. A. Clerk, and D. D. Awschalom, arXiv:1607.06503 (to appear in Nature Physics). [Preview Abstract] |
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