Spin dynamics and electronic states of N-<i>V</i>centers in diamond by EPR and four-wave-mixing spectroscopy

Redman, D. A.; Brown, Steven W.; Sands, Richard H.; Rand, Stephen C.

doi:10.1103/physrevlett.67.3420

Cited by 156 publications

(140 citation statements)

References 10 publications

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“…It was, however, noticed that although the fit explains the main trend, there is a significant deviation for several data points. For the N-V center, a previous study hinted at a two-phonon Orbach process as the main relaxation mechanism [31]. However, the temperature dependence observed here does not fit well to this model.…”

Section: Prl 101 047601 (2008) P H Y S I C a L R E V I E W L E T T Econtrasting

confidence: 53%

Quenching Spin Decoherence in Diamond through Spin Bath Polarization

et al. 2008

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We experimentally demonstrate that the decoherence of a spin by a spin bath can be completely eliminated by fully polarizing the spin bath. We use electron paramagnetic resonance at 240 GHz and 8 T to study the electron-spin coherence time T 2 of nitrogen-vacancy centers and nitrogen impurities in diamond from room temperature down to 1.3 K. A sharp increase of T 2 is observed below the Zeeman energy (11.5 K). The data are well described by a suppression of the flip-flop induced spin bath fluctuations due to thermal electron-spin polarization. T 2 saturates at 250 s below 2 K, where the polarization of the electron-spin bath exceeds 99%. DOI: 10.1103/PhysRevLett.101.047601 PACS numbers: 76.30.Mi, 03.65.Yz Overcoming spin decoherence is critical to spintronics and spin-based quantum information processing devices [1,2]. For spins in the solid state, a coupling to a fluctuating spin bath is a major source of the decoherence. Therefore, several recent theoretical and experimental efforts have aimed at suppressing spin bath fluctuations [3][4][5][6][7][8][9]. One approach is to bring the spin bath into a well-known quantum state that exhibits little or no fluctuations [10,11]. A prime example is the case of a fully polarized spin bath. The spin bath fluctuations are fully eliminated when all spins are in the ground state. In quantum dots, nuclear spin bath polarizations of up to 60% have been achieved [12,13]. However, a polarization above 90% is needed to significantly increase the spin coherence time [14]. Moreover, thermal polarization of the nuclear spin bath is experimentally challenging due to the small nuclear magnetic moment. Electron-spin baths, however, may be fully polarized thermally at a few degrees of Kelvin under an applied magnetic field of 8 T.Here we investigate the relationship between the spin coherence of nitrogen-vacancy (N-V) centers in diamond and the polarization of the surrounding spin bath consisting of nitrogen (N) electron spins. N-V centers consist of a substitutional nitrogen atom adjoining to a vacancy in the diamond lattice. The N-V center, which has long spin coherence times at room temperature [15,16], is an excellent candidate for quantum information processing applications as well as conducting fundamental studies of interactions with nearby electronic spins [16 -18] and nuclear spins [19,20]. In the case of type-Ib diamond, as studied here, the coupling to a bath of N electron spins is the main source of decoherence for an N-V center spin [15,21]. We have measured the spin coherence time (T 2 ) and spin-lattice relaxation time (T 1 ) in spin ensembles of N-V centers and single N impurity centers (P1 centers) using pulsed electron paramagnetic resonance (EPR) spectroscopy at 240 GHz. By comparing the values of T 1 and T 2 at different temperatures, we verify that the mechanism determining T 2 is different from that of T 1 . Next, we investigate the temperature dependence of T 2 .At 240 GHz and 8.6 T where the Zeeman energy of the N centers corresponds to 11.5 K, the polariza...

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Section: Prl 101 047601 (2008) P H Y S I C a L R E V I E W L E T T Econtrasting

confidence: 53%

Quenching Spin Decoherence in Diamond through Spin Bath Polarization

et al. 2008

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“…This device has been probed as a highly efficient semi-conducting single photon source [15]. Lambda configuration for the emitter can be obtained, taking advantage of the two possible biexcitonic transitions in quantum dots [16] or the different spin states in the optical transitions in a single N-V center [17], for instance. Superconducting qubits in circuit QED offer another natural playground for the exploration of 1D atoms properties [18,19].…”

Section: Introductionmentioning

confidence: 99%

Universal optimal broadband photon cloning and entanglement creation in one-dimensional atoms

Valente

Poizat

et al. 2012

Phys. Rev. A

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We study an initially inverted three-level atom in the lambda configuration embedded in a waveguide, interacting with a propagating single-photon pulse. Depending on the temporal shape of the pulse, the system behaves either as an optimal universal cloning machine, or as a highly efficient deterministic source of maximally entangled photon pairs. This quantum transistor operates over a wide range of frequencies, and can be implemented with today's solid-state technologies.

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“…Here D = 2.88 GHz [15,16,17], κ = 2.8 MHz/Gs [4,5], the hyperfine splitting A = 86 MHz or 114 MHz depending on the position of the nitrogen in the lattice [18], and I is its nuclear spin (I = 1). The magnetic dipolar interaction…”

Section: Modelmentioning

confidence: 99%

Quantum information processing using frequency control of impurity spins in diamond

2007

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Spin degrees of freedom of charged nitrogen-vacancy (NV − ) centers in diamond have large decoherence times even at room temperature, can be initialized and read out using optical fields, and are therefore a promising candidate for solid state qubits. Recently, quantum manipulations of NV − -centers using RF fields were experimentally realized. In this paper we show; first, that such operations can be controlled by varying the frequency of the signal, instead of its amplitude, and NV − -centers can be selectively addressed even with spacially uniform RF signals; second, that when several NV − -centers are placed in an off-resonance optical cavity, a similar application of classical optical fields provides a controlled coupling and enables a universal two-qubit gate (CPHASE). RF and optical control together promise a scalable quantum computing architecture.

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Spin dynamics and electronic states of N-Vcenters in diamond by EPR and four-wave-mixing spectroscopy

Cited by 156 publications

References 10 publications

Quenching Spin Decoherence in Diamond through Spin Bath Polarization

Quenching Spin Decoherence in Diamond through Spin Bath Polarization

Universal optimal broadband photon cloning and entanglement creation in one-dimensional atoms

Quantum information processing using frequency control of impurity spins in diamond

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