41.90.+n New sensor technologies

Ultrasensitive magnetometer using a single atom

Date: 
2014-11-28
Author(s): 

I. Baumgart, J.-M. Cai, A. Retzker, M. B. Plenio, Ch. Wunderlich

Reference: 

arXiv:1411.7893

Precision sensing, and in particular high precision magnetometry, is a central goal of research into quantum technologies. For magnetometers often trade-offs exist between sensitivity, spatial resolution, and frequency range. The precision, and thus the sensitivity of magnetometry scales as 1/(T2)1/2 with the phase coherence time, T2, of the sensing system playing the role of a key determinant.

Delayed entanglement echo for individual control of a large number of nuclear spins

Date: 
2016-04-19
Author(s): 

Z.-Y. Wang, J. Casanova, M. B. Plenio

Reference: 

arXiv:1604.05731

Methods for achieving quantum control and detection of individual nuclear spins by single electrons of solid-state defects play a central role for quantum information processing and nano-scale nuclear magnetic resonance (NMR). However, with standard techniques, no more than 8 nuclear spins have been resolved.

Robust dynamical decoupling sequences for individual-nuclear-spin addressing

Date: 
2015-06-17 - 2015-10-05
Author(s): 

J. Casanova, Z.-Y. Wang, J. F. Haase, M. B. Plenio

Reference: 

Phys. Rev. A 92, 042304 (2015)

We propose the use of non-equally-spaced decoupling pulses for high-resolution selective addressing of nuclear spins by a quantum sensor. The analytical model of the basic operating principle is supplemented by detailed numerical studies that demonstrate the high degree of selectivity and the robustness against static and dynamic control-field errors of this scheme.

Positioning nuclear spins in interacting clusters for quantum technologies and bioimaging

Date: 
2015-10-14 - 2016-05-10
Author(s): 

Z.-Y. Wang, J. F. Haase, J. Casanova, M. B. Plenio

Reference: 

Phys. Rev. B 93, 174104 (2016)

We propose a method to measure the hyperfine vectors between a nitrogen-vacancy (NV) center and an environment of interacting nuclear spins. Our protocol enables the generation of tunable electron-nuclear coupling Hamiltonians while suppressing unwanted internuclear interactions.

Signal transduction and conversion with color centers in diamond and piezo-elements

Date: 
2014-04-25
Author(s): 

J. Cai, F. Jelezko, M. B. Plenio

Reference: 

arXiv:1404.6393

The ability to measure weak signals such as pressure, force, electric field, and temperature with nanoscale devices and high spatial resolution offers a wide range of applications in fundamental and applied sciences. Here we present a proposal for a hybrid device composed of thin film layers of diamond with color centers implanted and piezo-active elements for the transduction and measurement of a wide variety of physical signals.

All-optical high-resolution magnetic resonance using a nitrogen-vacancy spin in diamond

Date: 
2014-04-04
Author(s): 

Z.-Y. Wang, J.-M. Cai, A. Retzker, M. B. Plenio

Reference: 

arXiv:1404.1190

We propose an all-optical scheme to prolong the quantum coherence of a negatively charged nitrogen-vacancy (NV) center in diamond. Optical control of the NV spin suppresses energy fluctuations of the 3A2 ground states and forms an energy gap protected subspace. By optical control, the spectral linewidth of magnetic resonance is much narrower and the measurement of the frequencies of magnetic field sources has higher resolution.

Testing quantum gravity by nanodiamond interferometry with nitrogen-vacancy centers

Date: 
2014-03-24 - 2014-09-22
Author(s): 

A. Albrecht, A. Retzker and M. B. Plenio

Reference: 

Phys. Rev. A 90, 033834 (2014)

Interferometry with massive particles may have the potential to explore the limitations of standard quantum mechanics in particular where it concerns its boundary with general relativity and the yet to be developed theory of quantum gravity. This development is hindered considerably by the lack of experimental evidence and testable predictions.

Magnetic hose: Routing and Long-distance Transportation of Magnetic Fields

Date: 
2013-04-23
Author(s): 

Carles Navau, Jordi Prat-Camps, Oriol Romero-Isart, J. Ignacio Cirac, Alvaro Sanchez

Reference: 

arXiv:1304.6300v1

Magnetism is a fundamental interaction shaping our physical world, at the basis of technologies such as magnetic recording or energy generation. Unlike electromagnetic waves, which can be routed and transmitted with waveguides to long distances, magnetic fields rapidly decay with distance.

Electric-field sensing using single diamond spins

Date: 
2011-04-17
Author(s): 

F. Dolde, H. Fedder, M. Doherty, T. Nöbauer, F. Rempp, G. Balasubramanian, T. Wolf, F. Reinhard, L. Hollenberg, F. Jelezko, J. Wrachtrup

Reference: 

Nature Physics, 7 (2011), pp 459 - 463
doi:10.1038/nphys1969

The ability to sensitively detect individual charges under ambient conditions would benefit a wide range of applications across disciplines. However, most current techniques are limited to low-temperature methods such as single-electron transistors, single-electron electrostatic force microscopy and scanning tunnelling microscopy. Here we introduce a quantum-metrology technique demonstrating precision three-dimensional electric-field measurement using a single nitrogen-vacancy defect centre spin in diamond. An a.c.

A trapped-ion local field probe

Date: 
2010-07-17
Reference: 

G. Huber, F. Ziesel, U.G. Poschinger, K. Singer, F. Schmidt-Kaler
Applied Physics B: Lasers and Optics 100, 725 (2010)
http://arxiv.org/abs/1003.3735

We introduce a measurement scheme that utilizes a single ion as a local field probe. The ion is confined in a segmented Paul trap and shuttled around to reach different probing sites. By the use of a single atom probe, it becomes possible characterizing fields with spatial resolution of a few nm within an extensive region of millimeters. We demonstrate the scheme by accurately investigating the electric fields providing the confinement for the ion. For this we present all theoretical and practical methods necessary to generate these potentials.

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