16.20.Dc Defect centers in diamonds

Measuring nanoscale magnetic write head fields using a hybrid quantum register

Date: 
2016-02-09
Author(s): 

Jakobi, I., Neumann, P., Wang, Y., Dasari, D., Hallak, F. E., Bashir, M. A., Markham, M., Edmonds, A., Twitchen, D. & Wrachtrup, J.

Reference: 

arXiv:1602.02948 [cond-mat] (2016)

The generation and control of nanoscale magnetic fields are of fundamental interest in material science and a wide range of applications. Nanoscale magnetic resonance imaging quantum spintronics for example require single spin control with high precision and nanoscale spatial resolution using fast switchable magnetic fields with large gradients. Yet, characterizing those fields on nanometer length scales at high band width with arbitrary orientation has not been possible so far.

Heralded Control of Mechanical motion by Single Spins

Date: 
2016-05-22
Author(s): 

D. D. Bhaktavatsala Rao, S. Ali Momenzadeh, Jörg Wrachtrup

Reference: 

arXiv:1605.06812 [quant-ph]

We propose a method to achieve high degree control of nanomechanical oscillators by coupling their mechanical motion to single spins. By manipulating the spin alone and measuring its quantum state heralds the cooling or squeezing of the oscillator even for weak spin-oscillator couplings. We analytically show that the asymptotic behavior of the oscillator is determined by a spin-induced thermal filter function whose overlap with the initial thermal distribution of the oscillator determines its cooling, heating or squeezing.

Single spin optically detected magnetic resonance with 60–90 GHz (E-band) microwave resonators

Date: 
2015-06-22
Author(s): 

Aslam, N., Pfender, M., Stöhr, R., Neumann, P., Scheffler, M., Sumiya, H., Abe, H., Onoda, S., Ohshima, T., Isoya, J. & Wrachtrup, J.

Reference: 

Review of Scientific Instruments 86, 64704 (2015)

Nanoscale Detection of a Single Fundamental Charge in Ambient Conditions Using the NV− Center in Diamond

Date: 
2014-03-03
Author(s): 

Dolde, F., Doherty, M. W., Michl, J., Jakobi, I., Naydenov, B., Pezzagna, S., Meijer, J., Neumann, P., Jelezko, F., Manson, N. B. & Wrachtrup, J.

Reference: 

Phys. Rev. Lett. 112, 97603 (2014)

Nanoengineered Diamond Waveguide as a Robust Bright Platform for Nanomagnetometry Using Shallow Nitrogen Vacancy Centers

Date: 
2015-01-14
Author(s): 

Momenzadeh, S. A., Stöhr, R. J., de Oliveira, F. F., Brunner, A., Denisenko, A., Yang, S., Reinhard, F. & Wrachtrup, J.

Reference: 

Nano Lett. 15, 165–169 (2015)

High-fidelity transfer and storage of photon states in a single nuclear spin

Date: 
2016-06-06
Author(s): 

Yang, S., Wang, Y., Rao, D. D. B., Hien Tran, T., Momenzadeh, A. S., Markham, M., Twitchen, D. J., Wang, P., Yang, W., Stöhr, R., Neumann, P., Kosaka, H. & Wrachtrup, J.

Reference: 

Nature Photonics, advance online publication, 10.1038/nphoton.2016.103

Development of a high quality thin diamond membrane with embedded nitrogen-vacancy centers for hybrid spin-mechanical quantum systems

Date: 
2016-02-26
Author(s): 

Momenzadeh, S. A., de Oliveira, F. F., Neumann, P., Rao, D. D. B., Denisenko, A., Amjadi, M., Yang, S., Manson, N. B., Doherty, M. W. & Wrachtrup, J.

Reference: 

arXiv:1602.08320 [cond-mat]

Quantum metrology enhanced by repetitive quantum error correction

Date: 
2016-02-23
Author(s): 

Thomas Unden, Priya Balasubramanian, Daniel Louzon, Yuval Vinkler, Martin B. Plenio, Matthew Markham, Daniel Twitchen, Igor Lovchinsky, Alexander O. Sushkov, Mikhail D. Lukin, Alex Retzker, Boris Naydenov, Liam P. McGuinness, Fedor Jelezko

Reference: 

arXiv:1602.07144

The accumulation of quantum phase in response to a signal is the central mechanism of quantum sensing, as such, loss of phase information presents a fundamental limitation. For this reason approaches to extend quantum coherence in the presence of noise are actively being explored. Here we experimentally protect a room-temperature hybrid spin register against environmental decoherence by performing repeated quantum error correction whilst maintaining sensitivity to signal fields.

Filter design for hybrid spin gates

Date: 
2015-04-21 - 2015-08-18
Author(s): 

Andreas Albrecht and Martin B. Plenio

Reference: 

Phys. Rev. A 92, 022340

The impact of control sequences on the environmental coupling of a quantum system can be described in terms of a filter. Here we analyze how the coherent evolution of two interacting spins subject to periodic control pulses, using the example of a nitrogen vacancy center coupled to a nuclear spin, can be described in the filter framework in both the weak- and the strong-coupling limit. A universal functional dependence around the filter resonances then allows for tuning the coupling type and strength.

Optical hyperpolarization of 13C nuclear spins in nanodiamond ensembles

Date: 
2015-06-08 - 2015-11-18
Author(s): 

Q. Chen, I. Schwarz, F. Jelezko, A. Retzker, and M. B. Plenio

Reference: 

Phys. Rev. B 92, 184420

Dynamical nuclear polarization holds the key for orders of magnitude enhancements of nuclear magnetic resonance signals which, in turn, would enable a wide range of novel applications in biomedical sciences. However, current implementations of DNP require cryogenic temperatures and long times for achieving high polarization. Here we propose and analyze in detail protocols that can achieve rapid hyperpolarization of 13C nuclear spins in randomly oriented ensembles of nanodiamonds at room temperature.

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