Diamond-based single-photon sources and their application in quantum key distribution

Neu, Elke; Becher, Christoph

doi:10.1533/9780857096685.2.127

Cited by 9 publications

(4 citation statements)

References 109 publications

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“…, where b, c, τ 1 , and τ 2 are fitting parameters. We investigated the laser power dependence of τ 1 for another single PbV center, yielding an excited-state lifetime 51,52 of ∼3.7 ns (Supporting Information), which is consistent with another experimental result. 32 The fluorescence intensity is measured as a function of the excitation laser power, as shown in Figure 4d.…”

Section: ■ Experimental Conditionssupporting

confidence: 85%

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Low-Temperature Spectroscopic Investigation of Lead-Vacancy Centers in Diamond Fabricated by High-Pressure and High-Temperature Treatment

et al. 2021

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We report the optical observation of lead-vacancy (PbV) centers in diamond fabricated by Pb ion implantation and subsequent high-temperature annealing (2100℃ under high pressure (7.7 GPa). Their optical properties were characterized by photoluminescence at varying temperatures down to 5.7 K. We observed intense emission peaks at 550 and 554 nm with a large splitting of approximately 3900 GHz. The two lines are thought to correspond to the zero phonon line (ZPL) of PbV centers with split ground and excited states. A cubic trend of the ZPL width was observed while varying temperature. We performed polarization measurements of the two lines in a single PbV center, showing nearly orthogonal dipole polarizations. These optical measurements strongly indicate that the PbV center possesses 𝐷 symmetry in the diamond lattice. The observed large ground state splitting significantly suppresses the phononmediated transition, which causes decoherence of the electron spin state of the group IV color centers in diamond, expecting a long spin coherence time at a temperature of ~8 K.

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Section: ■ Experimental Conditionssupporting

confidence: 85%

“…, where 𝑏, 𝑐, 𝜏 , 𝜏 are fitting parameters. 𝜏 yields an estimation of the excited state lifetime of a florescent structure at a low excitation power 47 . The excited state lifetime of the observed single PbV center was estimated to be ~3.7 ns, which is consistent with another experimental result 31 .…”

Section: Resultsmentioning

confidence: 99%

Low-Temperature Spectroscopic Investigation of Lead-Vacancy Centers in Diamond Fabricated by High-Pressure and High-Temperature Treatment

et al. 2021

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“…Depending on the growth conditions, the shape of those pyramidal features can be varied according to the relative growth rates of different crystalline planes. This additional step can thus increase the concentration and localization of active colour centres [226][227][228], which can be useful to create quantum sensors or single photon sources based on this material [229]. In a similar way, fabrication of p-n electronic devices has been achieved by locally growing phosphorous doped layers on patterned diamond single crystals [230].…”

Section: Positioning Nvs In-planementioning

confidence: 99%

Chemical vapour deposition diamond single crystals with nitrogen-vacancy centres: a review of material synthesis and technology for quantum sensing applications

Achard¹,

Jacques²,

Tallaire³

2020

J. Phys. D: Appl. Phys.

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Diamond is a host for a wide variety of colour centres that have demonstrated outstanding optical and spin properties. Among them, the nitrogen-vacancy (NV) centre is by far the most investigated owing to its superior characteristics, which promise the development of highly sophisticated quantum devices, in particular for sensing applications. Nevertheless, harnessing the potential of these centres mainly relies on the availability of high quality and purity diamond single crystals that need to be specially designed and engineered for this purpose. The plasma assisted Chemical Vapour Deposition (CVD) has become a key enabling technology in this field of research. Nitrogen can indeed be directly in-situ doped into a high crystalline quality diamond matrix in a controlled way allowing the production of single isolated centres or ensembles that can potentially be integrated into a device.In this paper we will provide an overview on the requirements for synthesizing "quantum-grade" diamond films by CVD. These include the reduction of impurities and surrounding spins that limit coherence times, the control of NV density in a wide range of concentrations as well as their spatial localization within the diamond. Enhancing the charge state and preferential orientation of the colour centres is also discussed. These improvements in material fabrication have contributed to position diamond as one of the most promising solid-state quantum system and the first industrial applications in sensing are just starting to emerge.

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“…The everlasting interest in diamond continues today in step with the development of new applications across different fields of science. As such, diamond holds promise to be one of the premier materials for quantum applications [2], including quantum computing, generation of single photons [3], quantum sensing [4] and quantum memories [5].…”

Section: Introductionmentioning

confidence: 99%

The influence of phonon harmonicity on spectrally pure resonant Stokes fields

Stoikos,

Granados

2022

Preprint

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Thanks to their highly coherent emission and compact form factor, single axial mode diamond Raman lasers have been identified as a valuable asset for applications including integrated quantum technology, high resolution spectroscopy or coherent optical communications. While the fundamental emission linewidth of these lasers can be Fourier limited, their thermo-optic characteristics lead to drifts in their carrier frequency, posing important challenges for applications requiring ultra-stable emission. We propose here a method for measuring accurately the temperature-dependent index of refraction of diamond by employing standing Stokes waves produced in a monolithic Fabry-Pérot (FP) diamond Raman resonator. Our approach takes into account the influence of the temperature on the first-order phonon line and the average lattice phonon frequency under intense stimulated Raman scattering (SRS) conditions. We further utilize this model to calculate the temperaturedependent thermo-optic coefficient and the Grüneisen parameter of diamond in the visible spectral range. The theory is accompanied by the demonstration of tunable Fourier-limited Stokes nanosecond pulses with a stabilized center frequency deviation of less than <4 MHz.

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Diamond-based single-photon sources and their application in quantum key distribution

Cited by 9 publications

References 109 publications

Low-Temperature Spectroscopic Investigation of Lead-Vacancy Centers in Diamond Fabricated by High-Pressure and High-Temperature Treatment

Low-Temperature Spectroscopic Investigation of Lead-Vacancy Centers in Diamond Fabricated by High-Pressure and High-Temperature Treatment

Chemical vapour deposition diamond single crystals with nitrogen-vacancy centres: a review of material synthesis and technology for quantum sensing applications

The influence of phonon harmonicity on spectrally pure resonant Stokes fields

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