Bulletin of the American Physical Society
APS March Meeting 2019
Volume 64, Number 2
Monday–Friday, March 4–8, 2019; Boston, Massachusetts
Session A36: Hybrid Quantum SystemsInvited
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Sponsoring Units: DAMOP Chair: Mukund Vengalattore, Cornell University Room: BCEC 205C |
Monday, March 4, 2019 8:00AM - 8:36AM |
A36.00001: Perfect bosonic quantum state transfer using imperfect transducers and interference Invited Speaker: Aashish Clerk The ability to faithfully transfer quantum states between disparate quantum systems is a crucial functionality for quantum information processing. Quantum transducers are often limited by a weak overall coupling strength, or by unwanted spurious interactions. I will discuss recent theoretical work showing that such imperfect transducers can nonetheless be used to accomplish perfect transduction by harnessing interference effects. Unlike other recent approaches for mitigating transduction errors, our approach does not require the ability to inject squeezing at both source and receiver systems, and is applicable to a wide class of imperfect transducers. Our work has direct relevance to optomechanical microwave-to-optics transduction, and also to hybrid quantum memory schemes. |
Monday, March 4, 2019 8:36AM - 9:12AM |
A36.00002: Combined feedback and sympathetic cooling of a mechanical oscillator coupled to ultracold atoms Invited Speaker: Christoph Becker A promising route to novel quantum technologies are hybrid quantum systems, which combine the advantages of several individual quantum systems. We have realized a hybrid atomic-mechanical experiment consisting of a Si3N4 membrane oscillator cryogenically precooled to 500 mK and optically coupled to a cloud of laser cooled 87Rb atoms. Here, we demonstrate active feedback cooling of the oscillator to a minimum mode occupation of n=16 corresponding to a mode temperature of T≈ 200 μK. Furthermore, we characterize in detail the coupling of the membrane to the atoms by means of sympathetic cooling. By simultaneously applying both cooling methods we demonstrate the possibility of preparing the oscillator near the motional ground state while it is coupled to the atoms. Realistic modifications of our setup will enable the creation of a ground state hybrid quantum system, which opens the door for coherent quantum state transfer, teleportation and entanglement as well as quantum enhanced sensing applications. |
Monday, March 4, 2019 9:12AM - 9:48AM |
A36.00003: A Topological Source of Quantum Light Invited Speaker: Mohammad Hafezi TBD |
Monday, March 4, 2019 9:48AM - 10:24AM |
A36.00004: Phonon networks with SiV centers in diamond waveguides Invited Speaker: Peter Rabl Electronic and nuclear spins associated with defects in solids comprise a promising platform for various quantum technologies. Prominent examples are NV and SiV centers in diamond, for which many techniques for coherent manipulations and local entanglement operations are already available. However, despite the impressive progress in the local control of spin qubits in diamond and other materials, the next big step of coherently integrating many spin qubits into larger networks has not been achieved yet. In this talk I will discuss a new approach to reach this goal by using quantized mechanical vibrations to mediate interactions between distant spin qubits. Specifically, I will describe the implementation of phonon quantum networks, where multiple SiV centers are coupled to propagating phonon modes in a quasi-1D diamond waveguide. In this setting, quantum states encoded in long-lived electronic spin states can be converted into travelling phonon wave packets and be reabsorbed by a distant defect center in a fully controllable way. I will show that under realistic experimental conditions, this technique enables the implementation of high-fidelity, scalable quantum communication protocols within chip-scale spin-qubit networks. |
Monday, March 4, 2019 10:24AM - 11:00AM |
A36.00005: Optical and mechanical properties of superfluid helium drops levitated in vacuum Invited Speaker: Jack Harris Many of the goals of quantum optomechanics require a combination of low optical and mechanical loss, low temperature, and high-precision measurement. As a material, superfluid helium offers a number of potential advantages in these regards: vanishing optical absorption and viscosity, high thermal conductivity, and the ability to cool itself efficiently via evaporation. Superfluid optomechanical devices have made considerable advances in recent years, but their performance is often limited by the materials used to contain the superfluid. To avoid these limits we have proposed the use of magnetic levitation to suspend a drop of liquid helium in vacuum[1] with the goal of using the drop's optical whispering gallery modes (WGMs) and its surface waves as an optomechanical system, while relying on the drop's evaporation to maintain low temperature. Each of these individual components (i.e., magnetic levitation, WGMs, and evaporative cooling) has been previously demonstrated by other groups, but combining them in a single device should offer several intriguing possibilities. We will describe some of these possibilities, and will also present recent measurements of mm-scale superfluid drops that are magnetically levitated in high vacuum. Specifically, we will describe the formation and trapping of the drops, and their evaporative cooling in the trap to ~ 330 mK. We will also present measurements of the drops’ mechanical resonances, and of their optical Mie resonances. |
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