Bulletin of the American Physical Society
2013 Joint Meeting of the APS Division of Atomic, Molecular & Optical Physics and the CAP Division of Atomic, Molecular & Optical Physics, Canada
Volume 58, Number 6
Monday–Friday, June 3–7, 2013; Quebec City, Canada
Session T6: Electron and Nuclear Spins for Quantum Information |
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Chair: David LeSage, Harvard-Smithsonian Center for Astrophysics Room: 302 |
Friday, June 7, 2013 8:00AM - 8:12AM |
T6.00001: Dressed-State Resonant Coupling between Bright \& Dark Spins in Diamond Chinmay Belthangady, Nir Bar-Gill, Linh My Pham, Keigo Arai, David Le Sage, Paola Cappellaro, Ronald Walsworth Nitrogen-vacancy (NV) color centers in diamond have attracted wide interest recently for applications in quantum information processing and sensing. We demonstrate a scheme to resonantly couple bright NV electronic spins to dark substitutional-Nitrogen (P1) electronic spins by dressing their spin states with oscillating magnetic fields. This resonant coupling mechanism can be used to transfer spin polarization from NV spins to nearby dark spins and could be used to cool a mesoscopic bath of dark spins to near-zero temperature, thus providing a resource for quantum information and sensing, and aiding studies of quantum effects in many-body spin systems. [Preview Abstract] |
Friday, June 7, 2013 8:12AM - 8:24AM |
T6.00002: Double quantum coherence control in NV- centers in Diamond at small fields Osama Moussa, Ian Hincks, David G. Cory The Nitrogen-Vacancy (NV) color center in diamond is a model quantum system with long coherence time, and the ability to optically initialize and read-out single centers. This makes it attractive for applications in quantum information processing, magnetometry, and magnetic imaging. The ground state of this localized defect is a triplet of magnetic states (ms = 0, $\pm$1), where the ms = 0 state is separated from the ms = $\pm$1 states at zero-field, and in the presence of a magnetic field, the ms = $\pm$1 states are further split due to the Zeeman interaction. Towards the goal of high-fidelity coherent control of the full qutrit space, we study the dynamics of double quantum coherence (DQC) (ms=+1 $\leftrightarrow$ ms=-1) in the regime where the Rabi drive is comparable to the Zeeman energy. We generate the DQC with high purity, selecting only the signal from the electronic transitions conditioned on the 14N nuclear spin being in the mn=0 state; we measure the coherence time of the DQC, and extend that coherence time using multiple-pulse sequences. [Preview Abstract] |
Friday, June 7, 2013 8:24AM - 8:36AM |
T6.00003: Cooling of Nuclear Spins in Diamond via Dark State Spectroscopy Swati Singh, Adi Pick, Mikhail D. Lukin, Susanne F. Yelin Interaction between an electronic state and its surrounding nuclear spin environment is a major source of decoherence in most artificial atomic systems. Recently, optical pumping techniques, including coherent population trapping were used to monitor and control the nuclear bath surrounding such solid state systems. We develop a semi-classical model reminiscent of VSCPT in atomic physics to explain the anomalous diffusion in the nuclear bath. We test our model by using it to explain the dark time distribution in experiments with NV centers in diamond. [Preview Abstract] |
Friday, June 7, 2013 8:36AM - 8:48AM |
T6.00004: All-optical quantum control operations for a solid-state spin using a lambda ($\Lambda$) system C.G. Yale, B.B. Buckley, D.J. Christle, F.J. Heremans, L.C. Bassett, D.D. Awschalom, G. Burkard The nitrogen-vacancy (NV) center in diamond is a promising solid-state spin qubit due to its spin-selective intersystem crossing (ISC) enabling initialization and readout of its spin state, while the use of microwave magnetic fields typically provides unitary control. Here, we demonstrate an alternate, fully optical technique to initialize, readout, and unitarily manipulate the NV center's spin below 10 K\footnote{C.G. Yale*, B.B. Buckley*, \textit{et al.} (submitted)}. To do so, we investigate optically-driven processes within an NV-center-based $\Lambda$ system using time-resolved methods and quantum state tomography. We initialize our qubit into any selectable superposition, or dark state, through coherent population trapping (CPT). Complementary spin-state readout along any basis is realized by measuring the transient photoluminescence emitted during CPT. We achieve unitary rotations of the spin state about any axis by driving stimulated Raman transitions. With these three protocols, we perform all-optical measures of single-spin coherence. Since these techniques do not rely on the NV center's specialized ISC or require on-chip microwave control, they provide a method for probing other potential solid-state qubits, not only those with NV-like structures. [Preview Abstract] |
Friday, June 7, 2013 8:48AM - 9:00AM |
T6.00005: Pulsed Electron Spin Resonance Quantum Information Processing with Stable Organic Free-Radical Spin Samples Troy Borneman, Olaf Benningshof, Hamid Mohebbi, Mohamad Niknam, Ivar Taminiau, Christopher Wood, Daniel Puzzuoli, David Cory Nuclear magnetic resonance (NMR) has served as an important tool for evaluating control methods in large Hilbert spaces that may be applied to a wide-range of systems for quantum information processing (QIP). The weak interaction of nuclear spins with their environment provides long coherence times, but also increases the difficulty of scaling NMR QIP systems to many qubits. By appending an electron spin, in the form of a stable free-radical, to a nuclear spin register, consisting of atomic nuclei in organic molecules, the potential for enhanced scalability is obtained. Fast quantum gates on the nuclear spins may be performed by pulsed electron spin resonance (ESR) manipulation of the electrons only. The electrons also enable the preparation of highly-pure processor states and the application of convenient quantum error correction. We present new results on performing pulsed ESR QIP with solid-state thin film samples of organic free-radicals integrated with superconducting electronics. A high quality factor superconducting microstrip resonator operating at X-band (10 GHz) frequencies provides sufficient sensitivity to investigate molecular monolayer samples. The resonator may also be used as a thermal bath to efficiently remove entropy from the electron-nuclear spin system. [Preview Abstract] |
Friday, June 7, 2013 9:00AM - 9:12AM |
T6.00006: Non-classical spin baths in diamond Linh Pham, Nir Bar-GIll, Chinmay Belthangady, Keigo Arai, David Le Sage, Stephen DeVience, Ronald Walsworth We study the non-classical dynamics of a controlled quantum system coupled to a spin bath, using an NV center in diamond interacting with its surrounding 13C nuclear spins as a unique paradigm. We measure samples with varying concentrations of nuclear spins and characterize the dynamics of the spin bath using a coherent spectroscopic technique based on multi-pulse sequences. Finally, through concurrent control of both the central NV spin and the nuclear spins in the bath, we explore polarization transfer to the spin bath. Such polarization transfer forms the basis for cooling of the bath and allows a systematic study of this process, its scaling, and its relation to the third law of thermodynamics. [Preview Abstract] |
Friday, June 7, 2013 9:12AM - 9:24AM |
T6.00007: Time-domain reconstruction of magnetic fields with an electron spin in diamond Alexandre Cooper, Honam Yum, Easwar Magesan, Paola Cappellaro Solid-state quantum probes can sense magnetic fields with high sensitivity and spatial resolution. These quantum magnetometers are particularly promising for characterizing the dynamics of nanoscale physical systems. We experimentally demonstrate efficient time-domain reconstruction of magnetic fields with an electron spin qubit in diamond. The form of the control pulse sequences allows for efficient reconstruction methods with minimal error in the reconstructed waveform. The generated control filter functions extract information about the signal while decoupling the sensor from its dephasing environment. These methods will be useful for detecting transient magnetic fields in biological systems and time-resolved magnetic resonance imaging. [Preview Abstract] |
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