Comparing phonon dephasing lifetimes in diamond using Transient Coherent Ultrafast Phonon Spectroscopy

Lee, K.C.; Sussman, Benjamin J.; Nunn, Joshua; Lorenz, Virginia O.; Reim, K.; Jaksch, Dieter; Walmsley, Ian A.; Spizzirri, P; Prawer, S.

doi:10.1016/j.diamond.2010.06.002

Cited by 44 publications

(25 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As is known the phonon linewidth Γ (FWHM, in units of cm −1 ) is related to the dephasing time T 2 through the expression Γ = ( πcT 2 ) −1 , providing broadening is homogeneous. Recently a technique called transient coherent ultrafast phonon spectroscopy (TCUPS) has been introduced and applied for measuring phonon dephasing times in diamond . For single crystal diamond samples produced by chemical vapor deposition (CVD), containing less than 1 ppm nitrogen impurity and a dislocation density at <10 4 cm −2 , TCUPS measurements yielded the optical phonon dephasing time of 7.0 ± 0.2 ps (at room temperature) and corresponding linewidth of 1.5 ± 0.07 cm −1 .…”

Section: Resultsmentioning

confidence: 99%

“…Recently a technique called transient coherent ultrafast phonon spectroscopy (TCUPS) has been introduced and applied for measuring phonon dephasing times in diamond . For single crystal diamond samples produced by chemical vapor deposition (CVD), containing less than 1 ppm nitrogen impurity and a dislocation density at <10 4 cm −2 , TCUPS measurements yielded the optical phonon dephasing time of 7.0 ± 0.2 ps (at room temperature) and corresponding linewidth of 1.5 ± 0.07 cm −1 . In the present work for HPHT diamond crystals of similar crystalline quality we have found that the intrinsic width (i.e.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Temperature dependence of the Raman line width in diamond: Revisited

Surovtsev

Kupriyanov

2015

J Raman Spectroscopy

View full text Add to dashboard Cite

Despite more than 60-year history of Raman scattering studies of diamond, considerable discrepancies between values of the Raman linewidth and its temperature dependence reported by different authors still exist. In this paper we report on the Raman scattering measurements performed for synthetic diamond crystals with nitrogen impurity content below 1 ppm (type IIa) and dislocation density 10 2 -10 3 cm À2 over the temperature range of 50-1000 K. The spectra were recorded with a high spectral resolution (~0.3 cm À1 ) and thoroughly analyzed to account for the instrumental response. The results demonstrate unequivocally that the temperature dependence of the Raman line width is well described by a model which assumes both three-phonon and four-phonon anharmonic processes. Elimination of the discrepancies in the line width description advances the Raman scattering technique in the characterization of diamonds with different crystalline quality, defect and/or impurity concentration.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Temperature dependence of the Raman line width in diamond: Revisited

Surovtsev

Kupriyanov

2015

J Raman Spectroscopy

View full text Add to dashboard Cite

show abstract

“…The most popular is time-resolved coherent anti-Stokes Raman scattering, where a large coherent phonon population is excited by a pair of laser pulses and is probed by a delayed pulse [7]. Another technique-transient coherent ultrafast phonon spectroscopy-uses the interference of the Stokes photons from the spontaneous Raman scattering of two coherent pumps to determine the decoherence of the vibrational mode [8,9]. While these techniques reveal the timescales over which the vibration decays or loses its phase coherence, observing single quanta of the vibration itself has proved far more elusive.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Decay of a Single Quantum of Vibration at Ambient Conditions

et al. 2019

View full text Add to dashboard Cite

A single quantum of excitation of a mechanical oscillator is a textbook example of the principles of quantum physics. But mechanical oscillators, despite their pervasive presence in nature and modern technology, do not generically exist in an excited Fock state. In the past few years, careful isolation of gigahertz-frequency nanoscale oscillators has allowed experimenters to prepare such states at millikelvin temperatures. These developments illustrate the tension between the basic predictions of quantum mechanics-which should apply to all mechanical oscillators even at ambient conditions-and the extreme conditions required to observe those predictions. We resolve the tension by creating a single Fock state of a 40-THz vibrational mode in a crystal at room temperature and atmospheric pressure. After exciting a bulk diamond with a femtosecond laser pulse and detecting a Stokes-shifted photon, the Ramanactive vibrational mode is prepared in the Fock state j1i with 98.5% probability. The vibrational state is then mapped onto the anti-Stokes sideband of a subsequent pulse, which when subjected to a Hanbury Brown-Twiss intensity correlation measurement reveals the sub-Poisson number statistics of the vibrational mode. By controlling the delay between the two pulses, we are able to witness the decay of the vibrational Fock state over its 3.9-ps lifetime at ambient conditions. Our technique is agnostic to specific selection rules, and should thus be applicable to any Raman-active medium, opening a new general approach to the experimental study of quantum effects related to vibrational degrees of freedom in molecules and solidstate systems.

show abstract

“…The pump generates longitudinal optical phonons at Ω, and a Stokes pulse with mean energy 0.16 µJ is emitted at λ S = 573 nm; this gives a photon conversion efficiency to the Stokes field of η = 0.11. The dephasing time for the vibrational excitation is estimated at Γ −1 = 7 ps, based on the Raman linewidth and transient coherent ultrafast phonon spectroscopy measurements [20], yielding Γτ p = 14. Using η and an analytic result for the Stokes pulse energy taken from the fully quantum model [21], we estimate the Raman gain to be gL ≈ 29, where g is the steady-state Raman gain coefficient and L is the gain length of the diamond.…”

Section: Methodsmentioning

confidence: 99%

Quantum random bit generation using stimulated Raman scattering

et al. 2011

Self Cite

View full text Add to dashboard Cite

Random number sequences are a critical resource in a wide variety of information systems, including applications in cryptography, simulation, and data sampling. We introduce a quantum random number generator based on the phase measurement of Stokes light generated by amplification of zero-point vacuum fluctuations using stimulated Raman scattering. This is an example of quantum noise amplification using the most noise-free process possible: near unitary quantum evolution. The use of phase offers robustness to classical pump noise and the ability to generate multiple bits per measurement. The Stokes light is generated with high intensity and as a result, fast detectors with high signal-to-noise ratios can be used for measurement, eliminating the need for single-photon sensitive devices. The demonstrated implementation uses optical phonons in bulk diamond.

show abstract

Comparing phonon dephasing lifetimes in diamond using Transient Coherent Ultrafast Phonon Spectroscopy

Cited by 44 publications

References 30 publications

Temperature dependence of the Raman line width in diamond: Revisited

Temperature dependence of the Raman line width in diamond: Revisited

Preparation and Decay of a Single Quantum of Vibration at Ambient Conditions

Quantum random bit generation using stimulated Raman scattering

Contact Info

Product

Resources

About