Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session U07: Hybrid Systems - Diamond Color Centers, MagnonicsFocus
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Sponsoring Units: DQI Chair: Dolev Bluvstein, Harvard University Room: 102 |
Thursday, March 5, 2020 2:30PM - 2:42PM |
U07.00001: Coherent storage of microwave photons over 100ms in an ensemble of electron spins. Emmanuel Flurin, Vishal Rajan, Emanuele Albertinale, Daniel Esteve, Patrice Bertet Electron and nuclear spins in crystals are attractive for storing quantum information due to their long |
Thursday, March 5, 2020 2:42PM - 2:54PM |
U07.00002: Optomechanically induced selective emitter—emitter interactions for control of quantum networks Tomas Neuman, Matthew Trusheim, Derek Wang, Isaac Harris, Prineha Narang Quantum emitters such as point-defects (artificial atoms) in diamond [1] can be used as elementary building blocks (qubits) of quantum information systems. The function of a a quantum network, however, also relies on efficient qubit-qubit interactions and thus allowing for practical implementation of quantum gates. Here we suggest a coupling scheme where optically active qubits (e.g. artificial atoms in diamond) of different excitation frequencies are dispersively coupled to a shared mode of an optical cavity. The cavity induces an effective generally off-resonant qubit-qubit interaction [2] prohibiting direct exchange of information among these qubits. By applying coherent acoustical driving [3] to modulate the qubit frequencies it is possible to bring to resonance a desired subset of qubits and thus selectively open an inter-qubit communication channel. We theoretically demonstrate this principle by solving the quantum master equation both numerically and analytically and suggest practical experimental scenarios to test our predictions. |
Thursday, March 5, 2020 2:54PM - 3:06PM |
U07.00003: Optically hyperpolarized nanodiamonds: quantum control and avenues for signal-enhanced NMR Ashok Ajoy, Emanuel Druga, Xudong Lv, Carlos Meriles, Jeffrey A Reimer, Alexander Pines I will describe quantum-assisted modalities to deliver signal enhancements in conventional MRI and NMR mediated by quantum defects in nanodiamond powder. This relies on the use of Nitrogen-Vacancy (NV) center spins within the diamond particles that can be optically polarized at room temperature with modest laser powers. This polarization can be transferred to nuclei surrounding the NV spins to hyperpolarize them to levels far above Boltzmann levels, manifesting in a highly enhanced NMR signature. Nanodiamonds are particularly suited for this task, given their large surface areas, and the ability to arrange for close physical contact between the polarized NVs and analyte molecules of interest. |
Thursday, March 5, 2020 3:06PM - 3:18PM |
U07.00004: Design and fabrication of large-scale diamond quantum memories in hybrid photonic circuits Tsung-Ju Lu, Noel Wan, Kevin Chen, Michael P Walsh, Matthew Trusheim, Lorenzo De Santis, Eric A Bersin, Isaac Harris, Sara Mouradian, Edward S Bielejec, Dirk R. Englund A central goal in quantum information processing is the development of scalable quantum processors and quantum networks. Towards this end, solid-state “artificial atoms” such as color centers in diamond are especially promising because they combine efficient optical interfaces, minutes of spin coherence, and potentially very-large-scale fabrication. Here, we describe the design, fabrication, and integration of diamond quantum micro-chiplets containing single SiV and GeV centers with photonic integrated circuits (PICs). A near-deterministic photonic nanofabrication produces unity coupling of emitters to single-mode diamond waveguide arrays, which are subsequently assembled on an aluminum nitride PIC for on-chip routing and manipulation of photons. The combination of these advances allows the construction of a 72-channel quantum memory microphotonic chip. The ability to assemble large numbers of quantum memories with phase-stable PICs enables an architecture for high-efficiency, multiplexed quantum repeaters on a chip. |
Thursday, March 5, 2020 3:18PM - 3:30PM |
U07.00005: Characterizing a 72-channel defect-free array of diamond quantum memories in a photonic integrated circuit Noel Wan, Tsung-Ju Lu, Kevin Chen, Michael P Walsh, Matthew Trusheim, Lorenzo De Santis, Eric A Bersin, Isaac Harris, Sara Mouradian, Edward S Bielejec, Dirk R. Englund In a previous abstract, we described the unity creation, coupling and integration of diamond "artificial atoms" of silicon vacancy (SiV) and germanium vacancy (GeV) centers with a large-scale photonic integrated circuit (PIC) in aluminum nitride. Here, we present the characterization of our 72-channel quantum memory chip. First, we demonstrate the routing of single-photon emission from 72 distinct optical channels in a fiber-coupled PIC. We performed low-temperature spectroscopy of the emitters, finding near-lifetime-limited optical transitions from both SiV and GeV centers following nanofabrication, micromanipulation, and heterogeneous integration. Additionally, we demonstrate the tuning of optical transitions with the same integrated system, overcoming the spectral inhomogeneities between separate emitter-waveguide systems. These advances set the stage for high-rate, multi-channel photon-mediated entanglement for quantum repeaters and computers. |
Thursday, March 5, 2020 3:30PM - 3:42PM |
U07.00006: Nanophotonic Quantum Registers based on Silicon Vacancy Centers in Diamond Erik Knall, Mihir K Bhaskar, Christian Nguyen, Ralf Riedinger, Bartholomeus J Machielse, David Levonian, Pavel Stroganov, Denis D Sukachev, Hongkun Park, Marko Loncar, Mikhail Lukin The development of scalable quantum technologies requires robust and well controlled quantum systems. Integrated solid-state devices are particularly promising because lithographically defined systems offer a route toward mass production. Recent progress in diamond nanofabrication has opened the door to unprecedented control of an optically accessible solid-state quantum memory, the silicon vacancy center in diamond. Integration of this point defect into a nanophotonic cavity combined with efficient photon detection recently enabled a proof-of-principle demonstration of memory enhanced quantum communication. In this talk, I will discuss how interfacing with nearby nuclear spins as well as improved device design and fabrication continue to push this system’s capabilities as a platform for foundational demonstrations of memory based quantum communication. |
Thursday, March 5, 2020 3:42PM - 3:54PM |
U07.00007: Coupling an Inverted Spin Ensemble to a Microwave Resonator Jason Ball, Peter Moroshkin, Shota Norimoto, Denis Konstantinov, Yuimaru Kubo Using an ensemble of nitrogen (P1) centers in diamond placed inside a 3-D loop-gap resonator, we observe population inversion of a satellite P1 transition when a microwave pump tone is applied to the central P1 transition. This inversion is manifested by amplification of the probe tone applied to the satellite transition. A mechanism for generating this inversion is proposed, involving higher-order cross relaxations within the P1 centers [1] and spin flip-flops with nearby nitrogen-vacancy (NV) centers that are also present in the diamond sample. |
Thursday, March 5, 2020 3:54PM - 4:06PM |
U07.00008: Coherent coupling of V[TCNE]x≈2 magnons to NV center spins Denis Candido, Gregory Fuchs, Michael Flatté The application of a rf magnetic field in magnetic materials yield the creation of magnons (spin waves) [1]. For the organic V[TCNE]x≈2 ferrimagnetic material [2], those magnons are found to have very long spin lifetime, thus enhancing the practical chances for applications. In our work, these excitations are coherent coupled – through the magnon fringe fields – to the spin of a Nitrogen-Vacancy (NV) center within a diamond substrate, placed below our magnetic structure. Interestingly, this coherent coupling has the potential to solve the problem of the communication between local qubits at low temperatures and optical photons, a necessary ingredient for networking and quantum communication. Here, we calculate the magnon spectrum, fringe fields and magnetizations profiles for V[TCNE]x≈2 disks. In addition, we also derive an effective Hamiltonian describing the coupling between NV center spins and magnons. We calculate the realistic effective Hamiltonian parameters, e.g., the spin-magnon coupling, for different physical setups. |
Thursday, March 5, 2020 4:06PM - 4:18PM |
U07.00009: Cavity mediated interactions and strong entanglement between YIG samples without using intrinsic nonlinearities. Jayakrishnan Muttathil Prabhakarapada Nair, Girish Agarwal A question attracting great attention is the possibility of quantum entanglement between macroscopic systems. Several systems like cold atomic ensembles; opto and electromechanical systems have been reported. It turns out that the magnetic systems like the excitations in YIG spheres in cavities could be excellent candidates for the quantum information tasks. |
Thursday, March 5, 2020 4:18PM - 4:30PM |
U07.00010: Improving coupling strengths and lifetimes in quantum magnonics Dany Lachance-Quirion, Samuel Piotr Wolski, Yutaka Tabuchi, Shingo Kono, Yoshiki Sunada, Koji Usami, Yasunobu Nakamura Quantum magnonics is an architecture in which collective modes of spin excitations in magnetically-ordered systems interact coherently with superconducting qubits. One of the main milestones to be demonstrated in quantum magnonics is the creation and observation of macroscopic quantum states of magnons. This task is challenging due to (i) the second-order nature of the effective interaction between magnetostatic modes and superconducting qubits and (ii) the relatively high relaxation rate of magnons. The first challenge is tackled by using a three-dimensional lumped-element microwave cavity designed to optimally enhance the effective coupling strength up to a few tens of MHz. Furthermore, we have observed that two-level systems (TLSs) in yttrium iron garnet at millikelvin temperatures have lifetimes much longer than the magnon lifetime. The long lifetime of the TLSs could potentially enable us to perform quantum magnonics experiments in an out-of-equilibrium situation where magnon decay is partially suppressed. Both advances are important steps towards the observation of quantum states of magnons. |
Thursday, March 5, 2020 4:30PM - 4:42PM |
U07.00011: High frequency ferromagnetic spectroscopy enabled by coupling pairs of magnons to NV spins Brendan McCullian, Ahmed Thabt, Benjamin Gray, Alex Melendez, Michael Wolf, Vladimir L Safonov, Denis Pelekhov, Vidya P Bhallamudi, Michael Page, P Chris Hammel Coupling NV center defects in diamond to ferromagnetic dynamics is of interest for both quantum sensing and for NV spin manipulation. We have used NV relaxometry to detect driven ferromagnetic dynamics in a low-damping insulating ferrimagnet, nickel zinc aluminum ferrite. We determine that NV coupling to driven magnetization has two regimes: first, when the uniform mode FMR frequency is less than the NV spin resonance frequency, and the converse. A driven spinwave instability in the nickel ferrite populates the magnons far above thermal levels. The spectral response of NV-ferromagnet coupling in the first regime can be understood from the spinwave instability physics. The second regime of NV-ferromagnet coupling can be understood via a two-magnon relaxation process. These results further the understanding of how driven ferromagnetic dynamics lead to NV spin relaxation, and demonstrate the potential to detect magnons with frequencies well above the NV frequency. |
Thursday, March 5, 2020 4:42PM - 4:54PM |
U07.00012: Electrical switching of spin-magnon interaction Abhishek Solanki, Simeon Bogdanov, Avinash Rustagi, Neil Ross Dilley, Tingting Shen, Punyashloka Debashis, Zhihong Chen, Joerg Appenzeller, Yong Chen, Vladimir Shalaev, Pramey Upadhyaya In recent years, strong interaction between surface confined propagating spin waves in ferromagnetic materials and single spins in color centers of diamond has been utilized for applications like quantum sensing and coherent driving of spins. The ability to switch this interaction electrically is essential to deterministically couple two spins via spin waves. In this work, we demonstrate electrical tuning of the coupling between spin waves and electron spins of nitrogen-vacancy centers (NV) in diamond. We electrically tune the magnon dispersion in thin CoFeB films, putting them in and out of resonance with the NV spin levels. The room-temperature magnetic noise of spin-waves affects the spin relaxation rate in NVs, in good quantitative agreement with analytical calculations. Our work opens up considerable opportunities for utilizing hybrid platforms combining quantum degree of freedom spins with macroscopic spin-waves in spin-based information and nanoscale sensing. |
Thursday, March 5, 2020 4:54PM - 5:30PM |
U07.00013: Optical quantum nondemolition measurement of a solid-state spin without a cycling transition Invited Speaker: Jeff Thompson Jeff Thompson has led the development of a new platform for hybrid systems, coupling a solid state system - implanted erbium ions - with a silicon nanophotonic resonator. |
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