ORCID Profile
0000-0003-2146-0412
Current Organisation
NVision Imaging Technologies GmbH
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Publisher: Springer Science and Business Media LLC
Date: 28-05-2006
DOI: 10.1038/NPHYS318
Publisher: American Association for the Advancement of Science (AAAS)
Date: 06-06-2008
Abstract: Robust entanglement at room temperature is a necessary requirement for practical applications in quantum technology. We demonstrate the creation of bipartite- and tripartite-entangled quantum states in a small quantum register consisting of in idual 13 C nuclei in a diamond lattice. In idual nuclear spins are controlled via their hyperfine coupling to a single electron at a nitrogen-vacancy defect center. Quantum correlations are of high quality and persist on a millisecond time scale even at room temperature, which is adequate for sophisticated quantum operations.
Publisher: American Physical Society (APS)
Date: 31-08-2016
Publisher: Springer Science and Business Media LLC
Date: 18-12-2011
Abstract: Sensors based on the nitrogen-vacancy defect in diamond are being developed to measure weak magnetic and electric fields at the nanoscale. However, such sensors rely on measurements of a shift in the Lamor frequency of the defect, so an accumulation of quantum phase causes the measurement signal to exhibit a periodic modulation. This means that the measurement time is either restricted to half of one oscillation period, which limits accuracy, or that the magnetic field range must be known in advance. Moreover, the precision increases only slowly (as T(-0.5)) with measurement time T (ref. 3). Here, we implement a quantum phase estimation algorithm on a single nuclear spin in diamond to combine both high sensitivity and high dynamic range. By achieving a scaling of the precision with time to T(-0.85), we improve the sensitivity by a factor of 7.4 for an accessible field range of 16 mT, or, alternatively, we improve the dynamic range by a factor of 130 for a sensitivity of 2.5 µT Hz(-1/2). Quantum phase estimation algorithms have also recently been implemented using a single electron spin in a nitrogen-vacancy centre. These methods are applicable to a variety of field detection schemes, and do not require quantum entanglement.
Publisher: American Physical Society (APS)
Date: 14-05-2009
Publisher: American Chemical Society (ACS)
Date: 11-09-2017
DOI: 10.1021/ACS.NANOLETT.7B01796
Abstract: In recent years, solid-state spin systems have emerged as promising candidates for quantum information processing. Prominent ex les are the nitrogen-vacancy (NV) center in diamond, phosphorus dopants in silicon (Si:P), rare-earth ions in solids, and V
Publisher: IOP Publishing
Date: 30-06-2014
Publisher: American Physical Society (APS)
Date: 21-02-2008
Publisher: IOP Publishing
Date: 30-04-2008
Publisher: AIP Publishing
Date: 10-03-2014
DOI: 10.1063/1.4868128
Abstract: Synthetic diamond production is a key to the development of quantum metrology and quantum information applications of diamond. The major quantum sensor and qubit candidate in diamond is the nitrogen-vacancy (NV) color center. This lattice defect comes in four different crystallographic orientations leading to an intrinsic inhomogeneity among NV centers, which is undesirable in some applications. Here, we report a microwave plasma-assisted chemical vapor deposition diamond growth technique on (111)-oriented substrates, which yields perfect alignment (94% ± 2%) of as-grown NV centers along a single crystallographic direction. In addition, clear evidence is found that the majority (74% ± 4%) of the aligned NV centers were formed by the nitrogen being first included in the (111) growth surface and then followed by the formation of a neighboring vacancy on top. The achieved homogeneity of the grown NV centers will tremendously benefit quantum information and metrology applications.
Publisher: IOP Publishing
Date: 07-01-2009
Publisher: American Physical Society (APS)
Date: 03-03-2014
Publisher: Wiley
Date: 11-2015
Publisher: Springer Science and Business Media LLC
Date: 28-02-2010
DOI: 10.1038/NPHYS1536
No related grants have been discovered for Philipp Neumann.