Person:
Yao, Norman

Profile Picture

Email Address

AA Acceptance Date

Birth Date

Research Projects

Organizational Units

Job Title

Last Name

Yao

First Name

Norman

Name

Yao, Norman
Author's Publications: search.filters.isAuthorOfPublication.ca3bc42c-c263-4275-9f01-34289870e1d9

Search Results

Now showing 1 - 10 of 21
  • Thumbnail Image
    Publication
    Phonon-Induced Spin-Spin Interactions in Diamond Nanostructures: Application to Spin Squeezing
    (American Physical Society (APS), 2013) Bennett, Steven; Yao, Norman; Otterbach, Johannes; Zoller, P.; Rabl, P.; Lukin, Mikhail
    We propose and analyze a novel mechanism for long-range spin-spin interactions in diamond nanostructures. The interactions between electronic spins, associated with nitrogen-vacancy centers in diamond, are mediated by their coupling via strain to the vibrational mode of a diamond mechanical nanoresonator. This coupling results in phonon-mediated effective spin-spin interactions that can be used to generate squeezed states of a spin ensemble. We show that spin dephasing and relaxation can be largely suppressed, allowing for substantial spin squeezing under realistic experimental conditions. Our approach has implications for spin-ensemble magnetometry, as well as phonon-mediated quantum information processing with spin qubits.
  • Thumbnail Image
    Publication
    Topologically protected quantum state transfer in a chiral spin liquid
    (Springer Nature, 2013) Yao, Norman; Laumann, Chris; Gorshkov, A.V.; Weimer, H.; Jiang, L.; Cirac, J.I.; Zoller, P.; Lukin, Mikhail
    Topology plays a central role in ensuring the robustness of a wide variety of physical phenomena. Notable examples range from the current-carrying edge states associated with the quantum Hall and the quantum spin Hall effects to topologically protected quantum memory and quantum logic operations. Here we propose and analyse a topologically protected channel for the transfer of quantum states between remote quantum nodes. In our approach, state transfer is mediated by the edge mode of a chiral spin liquid. We demonstrate that the proposed method is intrinsically robust to realistic imperfections associated with disorder and decoherence. Possible experimental implementations and applications to the detection and characterization of spin liquid phases are discussed.
  • Thumbnail Image
    Publication
    Collectively Enhanced Interactions in Solid-State Spin Qubits
    (American Physical Society (APS), 2013) Weimer, Hendrik; Yao, Norman; Lukin, Mikhail
    We propose and analyze a technique to collectively enhance interactions between solid-state quantum registers composed from random networks of spin qubits. In such systems, disordered dipolar interactions generically result in localization. Here, we demonstrate the emergence of a single collective delocalized eigenmode as one turns on a transverse magnetic field. The interaction strength between this symmetric collective mode and a remote spin qubit is enhanced by the square root of the number of spins participating in the delocalized mode. Mediated by such collective enhancement, long-range quantum logic between remote spin registers can occur at distances consistent with optical addressing. A specific implementation utilizing nitrogen-vacancy defects in diamond is discussed and the effects of decoherence are considered.
  • Thumbnail Image
    Publication
    Timekeeping with electron spin states in diamond
    (American Physical Society (APS), 2013) Hodges, J.; Yao, Norman; Maclaurin, Dougal; Rastogi, C.; Lukin, Mikhail; Englund, D.
    Frequency standards based on atomic states, such as Rb or Cs vapors, or single-trapped ions, are the most precise measures of time. Here we propose and analyze a precision oscillator approach based upon spins in a solid-state system, in particular, the nitrogen-vacancy defect in single-crystal diamond. We show that this system can have stability approaching portable atomic standards and is readily incorporable as a chip-scale device. Using a pulsed spin-echo technique, we anticipate an Allan deviation of σy=10−7τ−1/2 limited by thermally-induced strain variations; in the absence of such thermal fluctuations, the system is limited by spin dephasing and harbors an Allan deviation nearing ∼10−12τ−1/2. Potential improvements based upon advanced diamond material processing, temperature stabilization, and nanophotonic engineering are discussed.
  • Thumbnail Image
    Publication
    Realizing Fractional Chern Insulators in Dipolar Spin Systems
    (American Physical Society, 2013) Yao, Norman; Gorshkov, A. V.; Laumann, Chris; Läuchli, A. M.; Ye, J.; Lukin, Mikhail
    Strongly correlated quantum systems can exhibit exotic behavior controlled by topology. We predict that the ν=1/2 fractional Chern insulator arises naturally in a two-dimensional array of driven, dipolar-interacting spins. As a specific implementation, we analyze how to prepare and detect synthetic gauge potentials for the rotational excitations of ultracold polar molecules trapped in a deep optical lattice. With the motion of the molecules pinned, under certain conditions, these rotational excitations form a fractional Chern insulating state. We present a detailed experimental blueprint for its realization and demonstrate that the implementation is consistent with near-term capabilities. Prospects for the realization of such phases in solid-state dipolar systems are discussed as are their possible applications.
  • Thumbnail Image
    Publication
    Nanometre-scale thermometry in a living cell
    (Nature Publishing Group, 2013) Kucsko, Georg; Maurer, Peter Christian; Yao, Norman; Kubo, Michael; Noh, Hyungi; Lo, P. K.; Park, Hongkun; Lukin, Mikhail
    Sensitive probing of temperature variations on nanometre scales is an outstanding challenge in many areas of modern science and technology. In particular, a thermometer capable of subdegree temperature resolution over a large range of temperatures as well as integration within a living system could provide a powerful new tool in many areas of biological, physical and chemical research. Possibilities range from the temperature-induced control of gene expression and tumour metabolism to the cell-selective treatment of disease and the study of heat dissipation in integrated circuits. By combining local light-induced heat sources with sensitive nanoscale thermometry, it may also be possible to engineer biological processes at the subcellular level. Here we demonstrate a new approach to nanoscale thermometry that uses coherent manipulation of the electronic spin associated with nitrogen–vacancy colour centres in diamond. Our technique makes it possible to detect temperature variations as small as 1.8 mK (a sensitivity of \(9 mK Hz^{−1/2}\) in an ultrapure bulk diamond sample. Using nitrogen–vacancy centres in diamond nanocrystals (nanodiamonds), we directly measure the local thermal environment on length scales as short as 200 nanometres. Finally, by introducing both nanodiamonds and gold nanoparticles into a single human embryonic fibroblast, we demonstrate temperature-gradient control and mapping at the subcellular level, enabling unique potential applications in life sciences.
  • Thumbnail Image
    Publication
    Room-Temperature Quantum Bit Memory Exceeding One Second
    (American Association for the Advancement of Science (AAAS), 2012) Maurer, Peter Christian; Kucsko, Georg; Latta, C.; Jiang, L.; Yao, Norman; Bennett, S. D.; Pastawski, F.; Hunger, D.; Chisholm, Nicholas; Markham, M.; Twitchen, D. J.; Cirac, J. I.; Lukin, Mikhail
    Stable quantum bits, capable both of storing quantum information for macroscopic time scales and of integration inside small portable devices, are an essential building block for an array of potential applications. We demonstrate high-fidelity control of a solid-state qubit, which preserves its polarization for several minutes and features coherence lifetimes exceeding 1 second at room temperature. The qubit consists of a single \(^{13}C\) nuclear spin in the vicinity of a nitrogen-vacancy color center within an isotopically purified diamond crystal. The long qubit memory time was achieved via a technique involving dissipative decoupling of the single nuclear spin from its local environment. The versatility, robustness, and potential scalability of this system may allow for new applications in quantum information science.
  • Thumbnail Image
    Publication
    Long-Range Quantum Gates using Dipolar Crystals
    (American Physical Society (APS), 2012) Weimer, Hendrik; Yao, Norman; Laumann, Chris; Lukin, Mikhail
    We propose the use of dipolar spin chains to enable long-range quantum logic between distant qubits. In our approach, an effective interaction between remote qubits is achieved by adiabatically following the ground state of the dipolar chain across the paramagnet to crystal phase transition. We demonstrate that the proposed quantum gate is particularly robust against disorder and derive scaling relations, showing that high-fidelity qubit coupling is possible in the presence of realistic imperfections. Possible experimental implementations in systems ranging from ultracold Rydberg atoms to arrays of Nitrogen-Vacancy defect centers in diamond are discussed.
  • Thumbnail Image
    Publication
    Quantum logic between remote quantum registers
    (American Physical Society (APS), 2013) Yao, Norman; Gong, Z.-X; Laumann, Chris; Bennett, Steven; Duan, L.-M.; Lukin, Mikhail; Jiang, L.; Gorshkov, A.V.
    We consider two approaches to dark-spin-mediated quantum computing in hybrid solid-state spin architectures. First, we review the notion of eigenmode-mediated unpolarized spin-chain state transfer and extend the analysis to various experimentally relevant imperfections: quenched disorder, dynamical decoherence, and uncompensated long-range coupling. In finite-length chains, the interplay between disorder-induced localization and decoherence yields a natural optimal channel fidelity, which we calculate. Long-range dipolar couplings induce a finite intrinsic lifetime for the mediating eigenmode; extensive numerical simulations of dipolar chains of lengths up to L=12 show remarkably high fidelity despite these decay processes. We further briefly consider the extension of the protocol to bosonic systems of coupled oscillators. Second, we introduce a quantum mirror based architecture for universal quantum computing that exploits all of the dark spins in the system as potential qubits. While this dramatically increases the number of qubits available, the composite operations required to manipulate dark-spin qubits significantly raise the error threshold for robust operation. Finally, we demonstrate that eigenmode-mediated state transfer can enable robust long-range logic between spatially separated nitrogen-vacancy registers in diamond; disorder-averaged numerics confirm that high-fidelity gates are achievable even in the presence of moderate disorder.
  • Thumbnail Image
    Publication
    Topology, Localization, and Quantum Information in Atomic, Molecular and Optical Systems
    (2014-06-06) Yao, Norman; Lukin, Mikhail D.; Demler, Eugene; Sachdev, Subir
    The scientific interface between atomic, molecular and optical (AMO) physics, condensed matter, and quantum information science has recently led to the development of new insights and tools that bridge the gap between macroscopic quantum behavior and detailed microscopic intuition. While the dialogue between these fields has sharpened our understanding of quantum theory, it has also raised a bevy of new questions regarding the out-of-equilibrium dynamics and control of many-body systems. This thesis is motivated by experimental advances that make it possible to produce and probe isolated, strongly interacting ensembles of disordered particles, as found in systems ranging from trapped ions and Rydberg atoms to ultracold polar molecules and spin defects in the solid state. The presence of strong interactions in these systems underlies their potential for exploring correlated many-body physics and this thesis presents recent results on realizing fractionalization and localization. From a complementary perspective, the controlled manipulation of individual quanta can also enable the bottom-up construction of quantum devices. To this end, this thesis also describes blueprints for a room-temperature quantum computer, quantum credit cards and nanoscale quantum thermometry.