Thin Circular Diamond Membrane with Embedded Nitrogen-Vacancy Centers for Hybrid Spin-Mechanical Quantum Systems

AbstractGeneric mesoscopic quantum systems that interact with their environment tend to display appreciable correlations with environment that often play an important role in the physical properties of the system. However, the experimental methods needed to characterize such systems either ignore the role of initial correlations or scale unfavourably with system dimensions. Here, we present a technique that is agnostic to system–environment correlations and can be potentially implemented experimentally. Under a specific set of constraints, we demonstrate the ability to detect and measure specific correlations. We apply the technique to two cases related to Nitrogen Vacancy Centers (NV). Firstly, we use the technique on an NV coupled to a P1 defect centre in the environment to demonstrate the ability to detect dark spins. Secondly, we implement the technique on a hybrid quantum system of NV coupled to an optical cavity with initial correlations. We extract the interaction strength and effective number of interacting NVs from the initial correlations using our technique.

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Cyclic cooling of quantum systems at the saturation limit

npj Quantum Information ◽

10.1038/s41534-021-00408-z ◽

2021 ◽

Vol 7 (1) ◽

Author(s):

Sebastian Zaiser ◽

Chun Tung Cheung ◽

Sen Yang ◽

Durga Bhaktavatsala Rao Dasari ◽

Sadegh Raeisi ◽

...

Keyword(s):

Energy Conservation ◽

Quantum Coherence ◽

Heat Bath ◽

Boltzmann Distribution ◽

Quantum Systems ◽

Nitrogen Vacancy ◽

Saturation Limit ◽

Physical Limit ◽

Nitrogen Vacancy Centers ◽

State Spin

AbstractThe achievable bounds of cooling quantum systems, and the possibility to violate them is not well-explored experimentally. For example, among the common methods to enhance spin polarization (cooling), one utilizes the low temperature and high-magnetic field condition or employs a resonant exchange with highly polarized spins. The achievable polarization, in such cases, is bounded either by Boltzmann distribution or by energy conservation. Heat-bath algorithmic cooling schemes (HBAC), on the other hand, have shown the possibility to surpass the physical limit set by the energy conservation and achieve a higher saturation limit in spin cooling. Despite, the huge theoretical progress, and few principle demonstrations, neither the existence of the limit nor its application in cooling quantum systems towards the maximum achievable limit have been experimentally verified. Here, we show the experimental saturation of the HBAC limit for single nuclear spins, beyond any available polarization in solid-state spin system, the Nitrogen-Vacancy centers in diamond. We benchmark the performance of our experiment over a range of variable reset polarizations (bath temperatures), and discuss the role of quantum coherence in HBAC.

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Magnetically Modulated Fluorescence of Nitrogen-Vacancy Centers in Nanodiamonds for Ultrasensitive Biomedical Analysis

Analytical Chemistry ◽

10.1021/acs.analchem.1c01224 ◽

2021 ◽

Author(s):

Yuen Yung Hui ◽

Oliver J. Chen ◽

Hsin-Hung Lin ◽

Yu-Kai Su ◽

Katherine Y. Chen ◽

...

Keyword(s):

Nitrogen Vacancy ◽

Biomedical Analysis ◽

Nitrogen Vacancy Centers ◽

Modulated Fluorescence

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A robust fiber-based quantum thermometer coupled with nitrogen-vacancy centers

Review of Scientific Instruments ◽

10.1063/5.0044824 ◽

2021 ◽

Vol 92 (4) ◽

pp. 044904

Author(s):

Shao-Chun Zhang ◽

Yang Dong ◽

Bo Du ◽

Hao-Bin Lin ◽

Shen Li ◽

...

Keyword(s):

Nitrogen Vacancy ◽

Nitrogen Vacancy Centers

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Dark defect charge dynamics in bulk chemical-vapor-deposition-grown diamonds probed via nitrogen vacancy centers

Physical Review Materials ◽

10.1103/physrevmaterials.4.053602 ◽

2020 ◽

Vol 4 (5) ◽

Cited By ~ 1

Author(s):

A. Lozovoi ◽

D. Daw ◽

H. Jayakumar ◽

C. A. Meriles

Keyword(s):

Chemical Vapor Deposition ◽

Vapor Deposition ◽

Chemical Vapor ◽

Nitrogen Vacancy ◽

Charge Dynamics ◽

Nitrogen Vacancy Centers ◽

Bulk Chemical

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Spin-Mechanics with Nitrogen-Vacancy Centers and Trapped Particles

Micromachines ◽

10.3390/mi12060651 ◽

2021 ◽

Vol 12 (6) ◽

pp. 651

Author(s):

Maxime Perdriat ◽

Clément Pellet-Mary ◽

Paul Huillery ◽

Loïc Rondin ◽

Gabriel Hétet

Keyword(s):

Degrees Of Freedom ◽

Theoretical Background ◽

Nitrogen Vacancy ◽

Full Potential ◽

Strongly Coupled ◽

Trapped Particles ◽

Quantum Regime ◽

Atomic Spins ◽

Nitrogen Vacancy Centers ◽

Mechanical Oscillators

Controlling the motion of macroscopic oscillators in the quantum regime has been the subject of intense research in recent decades. In this direction, opto-mechanical systems, where the motion of micro-objects is strongly coupled with laser light radiation pressure, have had tremendous success. In particular, the motion of levitating objects can be manipulated at the quantum level thanks to their very high isolation from the environment under ultra-low vacuum conditions. To enter the quantum regime, schemes using single long-lived atomic spins, such as the electronic spin of nitrogen-vacancy (NV) centers in diamond, coupled with levitating mechanical oscillators have been proposed. At the single spin level, they offer the formidable prospect of transferring the spins’ inherent quantum nature to the oscillators, with foreseeable far-reaching implications in quantum sensing and tests of quantum mechanics. Adding the spin degrees of freedom to the experimentalists’ toolbox would enable access to a very rich playground at the crossroads between condensed matter and atomic physics. We review recent experimental work in the field of spin-mechanics that employ the interaction between trapped particles and electronic spins in the solid state and discuss the challenges ahead. Our focus is on the theoretical background close to the current experiments, as well as on the experimental limits, that, once overcome, will enable these systems to unleash their full potential.

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