Bulletin of the American Physical Society
48th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 62, Number 8
Monday–Friday, June 5–9, 2017; Sacramento, California
Session N8: Quantum Networks and Photon Sources |
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Chair: Steven Olmschenk, Denison University Room: 314 |
Thursday, June 8, 2017 10:30AM - 10:42AM |
N8.00001: An integrated diamond nanophotonics platform for quantum optical networks Mihir Bhaskar, Alp Sipahigil, Ruffin Evans, Denis Sukachev, Christian Nguyen, Michael Burek, Bartholomeus Machielse, Johannes Borregaard, Haig Atikian, Charles Meuwly, Lachlan Rogers, Petr Siyushev, Mathias Metsch, Jose Pacheco, Ryan Camacho, Edward Bielejec, Fedor Jelezko, Hongkun Park, Marko Loncar, Mikhail Lukin We demonstrate a platform for quantum optical networks based on silicon-vacancy (SiV) and germanium-vacancy (GeV) color centers in diamond nanodevices. By placing SiV centers inside diamond photonic crystal cavities, we realize a quantum optical switch controlled by a single SiV. Raman transitions are used to realize a single-photon source with a tunable frequency and bandwidth in a diamond waveguide. We measure intensity correlations of indistinguishable Raman photons emitted into a single waveguide, observing a quantum interference effect resulting from the superradiant emission of two entangled SiV centers. We incorporate GeV centers into nanoscale waveguides and demonstrate high single atom-photon interaction probabilities in a single-pass. We discuss prospects for a high-cooperativity (C \textgreater 10) spin-photon interface using GeV centers in diamond nanocavities. [Preview Abstract] |
Thursday, June 8, 2017 10:42AM - 10:54AM |
N8.00002: Decoherence-protected storage of a photonic polarization qubit in a single atom Matthias Koerber, Olivier Morin, Stefan Langenfeld, Andreas Neuzner, Stephan Ritter, Gerhard Rempe The ability to faithfully store quantum information is a key requirements for many quantum technologies. Here, we present a quantum memory based on a single $^{87}$Rb atom in a high-finesse optical resonator, capable of storing and retrieving single-photon polarization qubits with an overall efficiency of 18\% when probed with coherent laser pulses containing one photon on average. Initially the polarization of the photon is mapped onto the atom via a stimulated Raman adiabatic passage (STIRAP). Because the two atomic levels used to encode the qubit shift in opposite directions in the presence of a magnetic field the memory is susceptible to magnetic field fluctuations. This limits the coherence time to a few hundred microseconds. Using an optical Raman transfer we temporarily map the qubit to a protected subspace, thereby extending the coherence time to tens of milliseconds. It can be further increased to more than 100 milliseconds by means of a spin-echo technique. Our results are an important milestone towards the implementation of a quantum repeater allowing for long-distance quantum communication. [Preview Abstract] |
Thursday, June 8, 2017 10:54AM - 11:06AM |
N8.00003: Decentralized Routing and Diameter Bounds in Entangled Quantum Networks Laszlo Gyongyosi, Sandor Imre Entangled quantum networks are a necessity for any future quantum internet, long-distance quantum key distribution, and quantum repeater networks. The entangled quantum nodes can communicate through several different levels of entanglement, leading to a heterogeneous, multi-level entangled network structure. The level of entanglement between the quantum nodes determines the hop distance, the number of spanned nodes, and the probability of the existence of an entangled link in the network. In this work we define a decentralized routing for entangled quantum networks. We show that the probability distribution of the entangled links can be modeled by a specific distribution in a base-graph. The results allow us to perform efficient routing to find the shortest paths in entangled quantum networks by using only local knowledge of the quantum nodes. We give bounds on the maximum value of the total number of entangled links of a path. The proposed scheme can be directly applied in practical quantum communications and quantum networking scenarios. [Preview Abstract] |
Thursday, June 8, 2017 11:06AM - 11:18AM |
N8.00004: An Approach for trapped Ba$+$ ion-photon entanglement and quantum frequency conversion James Siverns, Xiao Li, Qudsia Quraishi Networking remotely situated trapped ion quantum memories involves the extraction, propagation and detection of photons which are entangled with internal qubit states of an ion [1]. Given the cumulative losses of these processes it is important to have a high-probability method to extract the photon. Even with high probability photon extraction, extending the networking range is challenging as the flying qubit's wavelength is severely attenuated when propagated in optical fiber. In this case, quantum frequency conversion has been proposed as an approach to extend the networking range. Here, we compare several methods of ion--photon entanglement generation, including strong and weak excitation methods, showing the fidelity and entanglement probability vary as a function of the photon collection optic's numerical aperture. We project that the highest photon generation probability (approximately 95{\%}) in 138Ba$+$ is achieved via shelving to a long-lived, low-lying D-state with a projected fidelity of approximately 89{\%} [2]. We then outline an approach for quantum frequency conversion of the extracted photon, with a view to hybrid or long-distance networking, useful for extending the range of ion-based quantum networks and hybrid quantum networks compromised of different types of quantum memories. [1] C. Monroe, et. al., Phys. Rev. A 89, 022317 (2014). [2] J. Siverns, X. Li and Q. Quraishi, App. Opt. 56, 3, B222 (2017). [Preview Abstract] |
Thursday, June 8, 2017 11:18AM - 11:30AM |
N8.00005: Towards a Quantum Memory assisted MDI-QKD node Mehdi Namazi, Giuseppe Vallone, Bertus Jordaan, Connor Goham, Reihaneh Shahrokhshahi, Paolo Villoresi, Eden Figueroa The creation of large quantum network that permits the communication of quantum states and the secure distribution of cryptographic keys requires multiple operational quantum memories. In this work we present our progress towards building a prototypical quantum network that performs the memory-assisted measurement device independent QKD protocol [1,2]. Currently our network combines the quantum part of the BB84 protocol with room-temperature quantum memory operation, while still maintaining relevant quantum bit error rates for single-photon level operation [3]. We will also discuss our efforts to use a network of two room temperature quantum memories, receiving, storing and transforming randomly polarized photons in order to realize Bell state measurements. [1] New Journal of Physics 16, 043005 (2014) [2] Phys. Rev. A 89, 012301 (2014) [3] arXiv:1609.08676 [Preview Abstract] |
Thursday, June 8, 2017 11:30AM - 11:42AM |
N8.00006: Enhanced photon indistinguishability in pulse-driven quantum emitters Herbert F Fotso Photon indistinguishability is an essential ingredient for the realization of scalable quantum networks. For quantum bits in the solid state, this is hindered by spectral diffusion[1, 2], the uncontrolled random drift of the emission/absorption spectrum as a result of fluctuations in the emitter's environment. We study optical properties of a quantum emitter in the solid state when it is driven by a periodic sequence of optical pulses with finite detuning with respect to the emitter. We find that a pulse sequence can effectively mitigate spectral diffusion and enhance photon indistinguishability. The bulk of the emission occurs at a set target frequency[3]; Photon indistinguishability is enhanced and is restored to its optimal value after every even pulse. Also, for moderate values of the sequence period and of the detuning, both the emission spectrum and the absorption spectrum have lineshapes with little dependence on the detuning. We describe the solution and the evolution of the emission/absorption spectrum as a function time. [1] K.-M. Fu et al, PRL 103, 256404 (2009); V. M. Acosta et al, PRL 108, 206401 (2012). [2] S. Yang et al., Nat. Photonics 10, 507 (2016); N. Trautmann and G. Alber, Phys. Rev. A 93, 053807 (2016). [3] H. F. Fotso et al, PRL 116, 033603 (2016). [Preview Abstract] |
Thursday, June 8, 2017 11:42AM - 11:54AM |
N8.00007: Phase-tuned entangled state generation between distant spin qubits Clemens Matthiesen, Robert Stockill, Megan Stanley, Lukas Huthmacher, Claire Le Gall, Mete Atat\"{u}re Entanglement is the central resource in quantum information processing, sensing and communication. Distribution of entanglement through non-local interactions, using photon interference and detection, is an attractive feature of flexible computation architectures where spatially separate nodes are locally controlled and connected via photonic channels. I will present recent work from the Atat\"{u}re group in Cambridge on the generation of entangled states between two electron spins confined in optically active indium-gallium-arsenide (InGaAs) quantum dots situated metres apart. The combination of a minimal single-photon state-projection scheme and the strong coherent light-matter interaction in these systems enables a distant entanglement rate of 7.3 kHz, the highest reported to date. With full control over the single-photon interference, we demonstrate the creation of entangled states with arbitrary phase. [Preview Abstract] |
Thursday, June 8, 2017 11:54AM - 12:06PM |
N8.00008: Correlation in photon pairs generated using four-wave mixing in a cold atomic ensemble Andrew Richard Ferdinand, Alejandro Manjavacas, Francisco Elohim Becerra Spontaneous four-wave mixing (FWM) in atomic ensembles can be used to generate narrowband entangled photon pairs at or near atomic resonances. While extensive research has been done to investigate the quantum correlations in the time and polarization of such photon pairs, the study and control of high dimensional quantum correlations contained in their spatial degrees of freedom has not been fully explored. In our work we experimentally investigate the generation of correlated light from FWM in a cold ensemble of cesium atoms as a function of the frequencies of the pump fields in the FWM process. In addition, we theoretically study the spatial correlations of the photon pairs generated in the FWM process, specifically the joint distribution of their orbital angular momentum (OAM). We investigate the width of the distribution of the OAM modes, known as the spiral bandwidth, and the purity of OAM correlations as a function of the properties of the pump fields, collected photons, and the atomic ensemble. These studies will guide experiments involving high dimensional entanglement of photons generated from this FWM process and OAM-based quantum communication with atomic ensembles. [Preview Abstract] |
Thursday, June 8, 2017 12:06PM - 12:18PM |
N8.00009: Generation of subnatural-linewdith biphotons from a hot rubidium atomic vapor cell Lingbang Zhu, Chi Shu, Xianxin Guo, Peng Chen, Yanhong Xiao, Heejeong Jeong, Shengwang Du We report the generation of narrowband entangled photon pairs (biphotons) from a hot atomic vapor cell. Making use of backward spontaneous four-wave mixing with electromagnetically induced transparency (EIT), we produced subnatural-linewidth (1.9 MHz < 6 MHz) biphotons from a Doppler-broadened (0.5 GHz) hot (63 C) paraffin-coated rubidium 87 vapor cell. The biphoton coherence time is controable and can be tuned up to 100 ns by EIT. The uncorrelated photons from resonance Raman scattering are suppressed by a spatially separated and tailored optical pumping beam. The spectral brightness is as high as 14,000 $s^-1 MHz^-1.$ As compared with the cold-atom experiment , the hot atomic vapour cell configuration is much simpler for operation and maintenance, and it is a continuous biphoton source. Our demonstration may lead to miniature narrowband biphoton sources based on atomic vapour cells for practical quantum applications and engineering. [Preview Abstract] |
Thursday, June 8, 2017 12:18PM - 12:30PM |
N8.00010: Room-temperature solid-state single-photon source with high purity and controllable waveforms Chun-Yuan Cheng, Shih-Wen Feng, Chen-Yeh Wei, Jen-Hung Yang, Yen-Ru Chen, Ya-Wen Chuang, Yang-Hsiung Fan, Chih-Sung Chuu Single photon emitters are indispensable to photonic quantum technologies. Here we demonstrate a room-temperature quantum-dot-based source of single photons with a purity of 99{\%} and control- lable waveforms. We show that the high purify of the single photons does not vary with excitation power or between different samples. The waveform-controlled single photons also have potential applications of optimum quantum state transfer in quantum networks, high-efficiency quantum storage and retrieval of single photons, or quantum key distribution with high key creation efficiency. [Preview Abstract] |
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