Nitrogen Vacancy Centers in Diamond I

10:20 Invited talk : Observation of Atomic Dipole Forces in Optically Trapped Nanodiamonds Containing NV Centers

C. Bradac, M. L. Juan, B. Besga, G. Molina-Terriza, T. Volz

Macquarie University (Australia)

We observe and measure atomic dipole forces for nanodiamonds (NDs) containing many NV centres, in a liquid environment. While holding the NDs (~150 nm in size) at the focus of classical optical tweezers in liquid, we employ a second laser beam slightly detuned from the dipole transition of the target colour centres and measure dispersive variations in the trap stiffness, due to the resonant forces, of ~10 percent.
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10:40 Invited talk : Coherent Control Over Diamond Nitrogen-Vacancy Center Spins with a Mechanical Resonator

Gregory Fuchs

Cornell University (USA)

We demonstrate coherent Rabi oscillations of single diamond nitrogen-vacancy (NV) center spins and spin ensembles driven directly by gigahertz frequency strain. These mechanically-driven spin transitions compliment magnetic field-based quantum control within the NV center spin triplet manifold to provide access to all spin transitions. This work demonstrates crucial steps toward a hybrid quantum interface between phonons and spins, and has potential applications that include quantum enhanced metrology of inertial motion and decoherence protection.
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11:00 Invited talk : Nitrogen Vacancy scanning magnetometry

Luis Javier Martinez Rodriguez, Thomas Hingant, Jean-Philippe Tetienne, Isabell Gross, Jean-François Roch, Vincent Jacques

Paris Sud University (France)

In this paper we present our recent work on scanning probe magnetometry with nitrogen vacancy centers in diamond. We focus on applications of this method to fundamental nanomagnetism.
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11:20 Invited talk : Nano-photonic quantum light-matter interfaces based on rare-earth-doped crystals

Tian Zhong, Jonathan Kindem, Evan Miyazono, Adrei Faraon

California Institute of Technology (USA)

We demonstrate coherent optical control of Nd rare-earth ions coupled to a nano-photonic resonator. Optical storage in the nano-resonator is demonstrated using multi-mode photon echo and atomic frequency comb protocols. The long optical and spin coherence of cavity-coupled rare-earth ions indicate that these are promising systems for on-chip quantum light-matter interfaces.
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11:40 Invited talk : Single spins in diamond as local probes for magnetic fields

Kevin Kai Chang (1),Antoine Dussaux (2),Jens Michael Boss (1),Chrisitan Lucas Degen (1)

(1)ETH Zurich (Switzerland) , (2)Nice Sophia-Antipolis University (France)

The nitrogen-vacancy (NV) center has been demonstrated to be a robust magnetic field sensor with high sensitivity and spatial resolution. We illustrate the applications and challenges of using single NV centers to image magnetic features both at ambient conditions and at low temperatures. In addition, we show different types of scanning probes including tips fabricated on bulk diamond membranes.
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12:00 Invited talk : Diamond nanobeam waveguide optomechanics

Paul Barclay

University of Calgary (Canada)

Using a quasi-isotropic etching technique to undercut nanostructures in bulk single crystal diamond, we have fabricated diamond nanobeam mechanical resonators and optical waveguides. The nanobeams support mechanical resonances with quality factor greater than 700,000, and can be sensitively probed using phase-matched evanescent coupling with an optical fiber taper. Optomechanical and photothermal effects excite self-oscillations, resulting in emergence of nonlinear nanomechanical softening.
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12:20 Invited talk : Towards Efficient Spin-Photon Interfaces for Scalable Quantum Networks on Photonics Integrated Circuits

Tim Schroder (1),Luozhou Li (1),Edward H. Chen (1),Michael Walsh (1),Igal Bayn (1), Faraz Najafi (1),Sara Mouradian (1),Matthew E. Trusheim (1),Ming Lu (2),Mircea Cotlet (2),Matthew L. Markham (3),Karl Berggren (1),Daniel J. Twitchen (3),Dirk Englund (1)

(1)MIT (USA) , (2)Brookhaven National Laboratory (USA) , (3)Element Six (USA)

We discuss recent progress towards building on-chip quantum networks of multiple spin qubits in nitrogen vacancy (NV) centers in diamond. An essential component for quatum networks is an efficient light-matter interface to entangle photons and stationary qubits. We describe NV-nanocavity systems in the Purcell regime with electron spin coherence times approaching the millisecond regime. We also describe patterned NV-cavity implantation, and techniques for high-yield integration multiple functional NV-cavity systems and single photon detectors on-chip.
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