Bulletin of the American Physical Society
APS March Meeting 2015
Volume 60, Number 1
Monday–Friday, March 2–6, 2015; San Antonio, Texas
Session S46: Invited Session: Hybrid Spin-Strained Systems in Diamond |
Hide Abstracts |
Sponsoring Units: GMAG GQI Chair: Sunil Bhave, Cornell University Room: 217A |
Thursday, March 5, 2015 8:00AM - 8:36AM |
S46.00001: Coherent control over diamond nitrogen-vacancy center spins with a mechanical resonator Invited Speaker: Gregory Fuchs We demonstrate coherent Rabi oscillations of diamond nitrogen-vacancy (NV) center spins driven directly by a mechanical resonator without mediation by a magnetic driving field. Using a bulk-mode acoustic resonator fabricated from single crystal diamond, we exert non-axial ac stress on NV centers positioned at an antinode of a gigahertz frequency mechanical mode. When the $\Delta m_s$ = $-$1 to +1 spin state splitting energy is tuned into resonance with a driven mechanical mode, we observe $\Delta m_s$ = $\pm$2 spin transitions, which are forbidden by the magnetic dipole selection rule. To rule out stray electric and magnetic fields as the origin of these spin transitions, we study the spin signal as a function depth within the diamond resonator. We find that the spin signal reproduces the periodicity of the acoustic standing wave, confirming the mechanical origin of the observed spin resonance $[1]$. Using single-crystal diamond mechanical resonators with $fQ$ products of $2\times 10^{12}$, we observe coherent mechanically driven Rabi oscillations up to 4 MHz $[2]$. For ensembles of NV centers coupled to the resonator, we analyze Rabi oscillations and their dephasing with a combination of spatially inhomogeneous mechanical driving and fluctuating magnetic fields from a noisy spin environment. Additionally, we examine the coherence of mechanically controlled NV center qubits and compare it to the coherence of magnetically controlled spin qubits in the NV center ground state spin manifold. This work demonstrates direct and coherent coupling between NV center spins and resonator phonons, which has potential for NV-based metrology using hybrid spin-mechanical sensors, fundamental research into spin-phonon interactions at the nanoscale, and as a platform for hybrid spin-mechanical quantum systems. $[1]$ E. R. MacQuarrie \emph{et al.}, Phys. Rev. Lett. \textbf{111}, 227602 (2013). $[2]$ E. R. MacQuarrie \emph{et al.}, arXiv:1411.5325 (2014). [Preview Abstract] |
Thursday, March 5, 2015 8:36AM - 9:12AM |
S46.00002: Strain-mediated mechanical coupling to diamond spins Invited Speaker: Ania Bleszynski Jayich Nitrogen-vacancy (NV) centers in diamond are atomic-scale spin systems with remarkable quantum properties that persist to room temperature. The recent demonstration of high-quality single-crystal diamond resonators has led to significant interest in a hybrid system consisting of NV spins that interact with the resonant phonon modes of a macroscopic mechanical resonator through crystal strain. We demonstrate dynamic, strain-mediated coupling of the mechanical motion of a diamond cantilever to the spin of an embedded NV. Via quantum control of the spin, we quantitatively characterize the axial and transverse strain sensitivities of the nitrogen--vacancy ground-state spin. The nitrogen--vacancy center is an atomic scale sensor and we demonstrate spin-based strain imaging with a strain sensitivity of 3x10$^{-6}$ strain Hz$^{1/2}$. We discuss prospects for reaching the regime of quantum coupling between phonons and spins, and we present our results in this direction. This hybrid system has exciting prospects for a phonon-based approach to integrating NVs into quantum networks. [Preview Abstract] |
Thursday, March 5, 2015 9:12AM - 9:48AM |
S46.00003: Dynamics of a strain-coupled, hybrid spin-oscillator system Invited Speaker: Jean Teissier A single spin coupled to a mechanical oscillator forms a prototypical hybrid quantum system. With a strong and robust coupling mechanism, such devices could yield high-performance nanoscale sensors, be applied for quantum information processing tasks or ultimately be used to study macroscopic objects in the quantum regime. In this talk, I will present our recent experiments where we established a novel type of such a hybrid spin-oscillator system. Specifically, we implemented for the first time diamond nanomechanical resonators, which are coupled to embedded Nitrogen-Vacancy (NV) centre electronic spins through crystalline strain. This strain coupling mechanism is highly robust, potentially strong and leads to interesting dynamics due to the nontrivial strain coupling Hamiltonian. I will illustrate these aspects though our recent experimental results, which include the first quantitative determination of the relevant strain coupling constants and the demonstration of resolved sideband operation in our devices. I will also discuss recent experiments in which we demonstrated coherent driving of NV spins through time-varying strain fields and studied the resulting intriguing dynamics of the strain-driven NV spin system. Our results constitute first essential steps towards future experiments of our hybrid system in the quantum regime. Examples for these include spin-based oscillator sideband cooling or the recently proposed generation of spin-squeezing in nanomechanical oscillators. [Preview Abstract] |
Thursday, March 5, 2015 9:48AM - 10:24AM |
S46.00004: Phonon cooling and lasing with nitrogen-vacancy centers in diamond Invited Speaker: Peter Rabl Diamond has emerged as a promising material for quantum applications, due in part to its optical and mechanical properties and in part to its addressable quantum defects. In this talk I will discuss the deformation potential interaction between nitrogen-vacancy (NV) centers and isolated mechanical modes in diamond nanostructures. Even on a single phonon level, this coupling can lead to significant shifts of the electronic and spin levels of the defect center and could provide a new tool to access and manipulate the quantum state of macroscopic mechanical systems. I will describe applications of this coupling mechanism for actuation (lasing) and ground state cooling of diamond nanoresonators and show how the combination of these schemes leads to PT-symmetry breaking phase transitions in coupled resonator arrays with engineered loss and gain. [Preview Abstract] |
Thursday, March 5, 2015 10:24AM - 11:00AM |
S46.00005: Diamond Nanomechanics Invited Speaker: Marco Loncar |
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700