Bulletin of the American Physical Society
52nd Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 66, Number 6
Monday–Friday, May 31–June 4 2021; Virtual; Time Zone: Central Daylight Time, USA
Session Q10: Quantum NetworksLive
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Chair: Alberto Marino, U. OK. |
Thursday, June 3, 2021 8:00AM - 8:12AM Live |
Q10.00001: Integrating cold atoms into optical waveguides David Johnson, Daniele Baldolini Hybrid quantum devices, incorporating both atoms and photons, can exploit the benefits of both to enable scalable architectures for quantum computing and quantum communication, as well as chip-scale sensors and single-photon sources. Production of such devices depends on the development of an interface between their atomic and photonic components. This should be compact, robust and compatible with existing technologies from both fields. We have previously demonstrated a compact interface that enables the interaction of cold Caesium atoms with resonant photons and now we plan to demonstrate Electromagnetically Induced Transparency (EIT) of Caesium atoms in a fibre. For this atoms are cooled in a magneto-optical trap and transferred to an optical dipole trap. Previously, these atoms were then positioned inside a transverse, 30 µm diameter through-hole in an optical fibre, created via laser micromachining. We trapped about 300 atoms at a temperature of 70µK. When the guided light is in resonance with the Caesium D2 line, up to 87% of it was absorbed by the atoms. We hope to improve on this setup and then begin implementing EIT. Our technique should be equally effective in optical waveguide chips and other existing photonic systems. |
Thursday, June 3, 2021 8:12AM - 8:24AM Live |
Q10.00002: Complete control of spatial correlations in quantum-correlated twin beams Gaurav Nirala, Siva T. Pradyumna, Ashok Kumar, Alberto M Marino Gaurav Nirala, |
Thursday, June 3, 2021 8:24AM - 8:36AM Live |
Q10.00003: Towards Cavity-Assisted Fast Rubidium-Tuned Quantum Light Sources Samet Demircan, Guodong Cui, Rishikesh Gokhale, Siddharth Sehgal, Justine Haupt, Paul Stankus, Eden Figueroa The realization of large-scale quantum networks has become a global priority at the frontier of quantum information science. As a technological backbone for these systems, the development of scalable single-photon sources tuned to rubidium transitions is of paramount importance. We report on our progress regarding the implementation of a DLCZ protocol heralded single-photon source [1] using an ensemble of cold rubidium simultaneously coupled to two optical cavities at the Stony Brook University (SBU) QIT Laboratory. Using a lambda system in the D1/D2 line, we stabilize one cavity to the F=1 to F’=1 transition. After pumping the atoms with the F=2 to F’=1 ('write') field, we observe Stokes photons emitted into the cavity mode with a rate of several kHz. We show preliminary results where these photons are used to herald the generation of Anti-Stokes photons (using a F=1 to F’=1 'read' field) into a second cavity mode coupled to the F=2 to F’=1 transition, achieving a cavity-assisted DLCZ landscape. We are planning to combine this source with a single-photon free-space optical link between SBU and Brookhaven National Laboratory (BNL) over a line-of-sight distance of 20km. We will also report on the current progress towards transmitting these rubidium-tuned photons from SBU and storing them in a remotely located atomic quantum memory at the BNL site. |
Thursday, June 3, 2021 8:36AM - 8:48AM Live |
Q10.00004: Resonant Excitation and Purcell Enhancement of Coherent Nitrogen-Vacancy Centers Coupled to a Fabry-Perot Micro-Cavity Maximilian Ruf, Matthew J Weaver, Suzanne van Dam, Yanik Herrmann, Ronald Hanson Future quantum networks will enable technologies such as communications secured by the last of nature and distributed quantum communication. The nitrogen-vacancy (NV) center in diamond is a promising candidate for a quantum network node, with all basic node capabilities and few-node network operation demonstrated. Further scaling of NV-based quantum networks towards many nodes at large distances is hindered by the relatively small emission and collection probability of spin-selective photons from the NV center upon resonant excitation. Integration into a cavity can boost both values via the Purcell effect, but poor optical coherence of near-surface NV centers has so far prevented their resonant optical control, as would be required for entanglement generation. |
Thursday, June 3, 2021 8:48AM - 9:00AM Live |
Q10.00005: Towards a mixed-species trapped-ion quantum network bethan nichol, David Nadlinger, Peter Drmota, Dougal Main, Raghavendra Srinivas, Gabriel Araneda, Christopher Ballance, David Lucas A larger system of trapped-ion qubits can be constructed using a modular approach with photonic interfaces. Starting from an entangled state of two 88Sr+ ions in spatially separate ion traps generated from such an interface [1], we want to transfer the entanglement to 43Ca+ “memory” qubits within each trap for further networking applications. For this transfer we require mixed species entanglement that does not degrade the basic remote entanglement fidelity of 94%. This fidelity can subsequently be improved through remote entanglement distillation, requiring high fidelity single species gates between the 43Ca+ ions. We discuss the design considerations involved in choosing optimal gate mechanisms. |
Thursday, June 3, 2021 9:00AM - 9:12AM Live |
Q10.00006: Temporal imaging and sub-Fourier spectroscopy for ultra narrowband single-photon systems Mateusz Mazelanik, Michal Parniak, Michał Lipka, Adam Leszczyński, Wojciech Wasilewski Manipulation and detection of photonic spectro-temporal modes via light-matter interfaces play a crucial role in quantum information processing and metrology. Feasible implementations of protocols merging the flexibility of atomic systems and spectro-temporal processing capabilities inherently require an ability to manipulate and detect temporal photonic modes with a spectral and temporal resolution matched to the narrowband atomic emission. Here we employ cold-atoms-based Gradient Echo Memory combined with novel ac-Stark spin-wave manipulation technique to demonstrate far-field temporal imaging achieving <20kHz spectral resolution and 1MHz bandwidth. Moreover, inspired by the real-space sub-Rayleigh imaging techniques we adjust our setup to implement a time inversion interferometer and demonstrate a sub-Fourier spectrometer that leads to a ten-fold improvement in spectral resolution while compared to the conventional (direct detection) approach. |
Thursday, June 3, 2021 9:12AM - 9:24AM Live |
Q10.00007: Prospects for Generation and Measurement of Arbitrary Photon Fock States Patrick Banner, Deniz Kurdak, James V Porto, Steven L Rolston The creation of arbitrary photon Fock states is an important step for various tasks of interest, from solving classically hard problems with linear optics quantum computing networks to creating NOON states that could perform metrology with enhanced resolution at the Heisenberg limit. Here we report on our progress in using a Rydberg-blockaded atomic ensemble to experimentally generate arbitrary photon Fock states. We will generate one Rydberg excitation at a time, then "shelve" the excitation into the ground-state manifold, storing it there while we repeat the process n times. The blockaded nature of the process allows us to do additional shelving while not "un-shelving" those already stored. We will read out all the excitations at once to generate an n-photon Fock state, and reconstruct the number distribution of our output state using click/no-click detectors and a version of the expectation-maximization algorithm, whose robustness to experimental imperfections we also study. |
Thursday, June 3, 2021 9:24AM - 9:36AM Live |
Q10.00008: An elementary quantum network of remote ⁸⁸Sr⁺ qubits David Nadlinger, Bethan Nichol, Peter Drmota, Gabriel Araneda, Dougal Main, Raghavendra Srinivas, David Lucas, Chris Ballance Remote entanglement is an essential resource for many quantum networking protocols. To create entangled states of two remote ⁸⁸Sr⁺ qubits, we first entangle each ion with the polarisation of spontaneously emitted 422 nm photons coupled into single-mode fibres, followed by entanglement swapping using linear optics. To minimise ion micromotion that would reduce photon mode overlap, we develop a simple technique for multi-dimensional stray field compensation without extra laser beams or spatially resolved imaging. We characterise the achieved photonic link performance, which (at 94% Bell state fidelity and an average rate of 182 s⁻¹ [1]) represents the state of the art in high-fidelity remote entanglement across all qubit platforms, and discuss recent progress towards networking applications such as quantum key distribution. |
Thursday, June 3, 2021 9:36AM - 9:48AM Live |
Q10.00009: A high-fidelity free-space trapped-ion photonic interface Peter Drmota, David Nadlinger, bethan nichol, Dougal Main, Raghavendra Srinivas, Gabriel Araneda, Joseph Goodwin, Chris Ballance, David Lucas Trapped atomic ions are a leading platform for quantum computing; they possess excellent coherence properties and have been used to demonstrate high-fidelity single and two-qubit operations. However, extending the size of trapped ion systems remains an outstanding challenge. Trapped ions are particularly well suited for photonic interfaces, which can be used to distribute entanglement over large distances, encouraging a modular architecture. We present a novel free-space photonic interface to a trapped 88Sr+ ion, enabling high-efficiency collection of spontaneously emitted photons whose polarisation is maximally entangled with the electronic state of the ion. We perform quantum state tomography to evaluate its performance and implement a remote "steering" protocol using a high-speed polarisation analyser. Finally, we discuss progress towards measurement-based blind quantum computing on this apparatus. |
Thursday, June 3, 2021 9:48AM - 10:00AM Live |
Q10.00010: Telecom single photons from a trapped Ba+ ion Uday Saha, John M Hannegan, James Siverns, Jake Cassell, Edo Waks, Qudsia Quraishi Long-distance fiber-based quantum networks require photons at telecommunication wavelengths that can be exchanged to interconnect qubits. Trapped ions are excellent candidates for quantum networks because of their long coherence times [1], high fidelity two-qubit gates [2], and the ability to generate entangled photons [3]. But virtually all trapped ions have strong optical dipole transitions at UV and visible wavelengths making the photons incompatible for long-distance fiber-based networks. Here, we demonstrate the first frequency conversion of visible photons emitted from a trapped barium ion into the telecom C-band. We use a two-stage conversion setup with 37% and 52% end-to-end conversion efficiency in the first and second stage respectively. We show that frequency conversion preserves the quantum nature of the emitted photons via second-order correlation measurements [4]. This approach could enable trapped ion quantum computers to communicate over long distances using a fiber network [5]. |
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