Decay of the rotary echoes for the spin of a nitrogen-vacancy center in diamond

Mkhitaryan, V. V.; Dobrovitski, V. V.

doi:10.1103/physrevb.89.224402

Cited by 18 publications

(20 citation statements)

References 91 publications

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“…Continuous dynamical decoupling [18][19][20][21][22][23][24][25][26][27] offers another possibility of suppressing environmental noise, where diminishing the effect of the controller noise can be achieved by different approaches. In this context, a rotary echo scheme [28,29] can be viewed as analogous to pulsed dynamical decoupling. The concatenation of several on-resonance driving fields [30][31][32][33][34] is another concept, but inherently connected to a reduction of the dressed energy gap, eventually limiting the performance of the scheme, and in particular reducing the qubit gate operation time.…”

Section: Introductionmentioning

confidence: 99%

Clock transition by continuous dynamical decoupling of a three-level system

Stark

Aharon

Huck

et al. 2018

Sci Rep

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We present a novel continuous dynamical decoupling scheme for the construction of a robust qubit in a three-level system. By means of a clock transition adjustment, we first show how robustness to environmental noise is achieved, while eliminating drive-noise, to first-order. We demonstrate this scheme with the spin sub-levels of the NV-centre’s electronic ground state. By applying drive fields with moderate Rabi frequencies, the drive noise is eliminated and an improvement of 2 orders of magnitude in the coherence time is obtained compared to the pure dephasing time. We then show how the clock transition adjustment can be tuned to eliminate also the second-order effect of the environmental noise with moderate drive fields. A further detailed theoretical investigation suggests an additional improvement of more than 1 order of magnitude in the coherence time which is supported by simulations. Hence, our scheme predicts that the coherence time may be prolonged towards the lifetime-limit using a relatively simple experimental setup.

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Section: Introductionmentioning

confidence: 99%

Clock transition by continuous dynamical decoupling of a three-level system

Stark

Aharon

Huck

et al. 2018

Sci Rep

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“…This scheme, known as continuous dynamical decoupling (CDD), has attracted a lot of attention in recent years [26][27][28][29][30][31][32][33][34][35]. The CDD procedure is more experimentally friendly than pulsed procedures and it also sets a natural stage for the implementation of two-qubit quantum gates [36][37][38].…”

Section: Introductionmentioning

confidence: 99%

Protecting theSWAPoperation from general and residual errors by continuous dynamical decoupling

et al. 2015

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We study the occurrence of errors in a continuously decoupled two-qubit state during a √ SWAP quantum operation under decoherence. We consider a realization of this quantum gate based on the Heisenberg exchange interaction, which alone suffices for achieving universal quantum computation. Furthermore, we introduce a continuous-dynamical-decoupling scheme that commutes with the Heisenberg Hamiltonian to protect it from the amplitude damping and dephasing errors caused by the system-environment interaction. We consider two error-protection settings. One protects the qubits from both amplitude damping and dephasing errors. The other features the amplitude damping as a residual error and protects the qubits from dephasing errors only. In both settings, we investigate the interaction of qubits with common and independent environments separately. We study how errors affect the entanglement and fidelity for different environmental spectral densities.

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“…Moreover, the Rabi fields generated by a mechanical resonator are noise filtered above a cutoff frequency ω c determined by the quality factor Q and the frequency of the resonance mode ω mech . This is a valuable feature since driving field noise has previously arXiv:1510.01194v1 [quant-ph] 5 Oct 2015 limited magnetic CDD efforts [11,12,14,[25][26][27]. For the resonator used in this work, ω c /2π = 110 kHz [28].…”

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confidence: 99%

Continuous dynamical decoupling of a single diamond nitrogen-vacancy center spin with a mechanical resonator

et al. 2015

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Inhomogeneous dephasing from uncontrolled environmental noise can limit the coherence of a quantum sensor or qubit. For solid state spin qubits such as the nitrogen-vacancy (NV) center in diamond, a dominant source of environmental noise is magnetic field fluctuations due to nearby paramagnetic impurities and instabilities in a magnetic bias field. In this work, we use ac stress generated by a diamond mechanical resonator to engineer a dressed spin basis in which a single NV center qubit is less sensitive to its magnetic environment. For a qubit in the thermally isolated subspace of this protected basis, we prolong the dephasing time T * 2 from 2.7 ± 0.1 µs to 15 ± 1 µs by dressing with a Ω = 581 ± 2 kHz mechanical Rabi field. Furthermore, we develop a model that quantitatively predicts the relationship between Ω and T * 2 in the dressed basis. Our model suggests that a combination of magnetic field fluctuations and hyperfine coupling to nearby nuclear spins limits the protected coherence time over the range of Ω accessed here. We show that amplitude noise in Ω will dominate the dephasing for larger driving fields.PACS numbers: 76.30. Mi, 63.20.kp, 76.60.Jx The triplet spin of the nitrogen-vacancy (NV) center in diamond has become a foundational component in both quantum metrology and future quantum information technologies. For sensing, the inhomogeneous dephasing time T * 2 of an NV center spin qubit can limit sensitivity to quasi-static fields. For quantum information applications, T * 2 can limit the number and the duration of gate operations that a qubit can undergo. Pulsed dynamical decoupling (PDD) techniques based on the principle of spin echoes refocus inhomogeneous dephasing and can extend T * 2 to the homogeneous spin dephasing time T 2 or longer [1][2][3][4][5][6]. These periodic pulse sequences enable precision sensing and long-lived quantum states, but they come with drawbacks. They usually limit sensing to a narrow bandwidth and erase signal built up from quasistatic fields. Moreover, commuting echo pulses with gate operations makes decoupling during multi-qubit gates a nontrivial task [7].Continuous dynamical decoupling (CDD) offers an alternative method for prolonging T * 2 that can be used when the limitations of PDD become too restrictive. NV center CDD protocols forego the standard Zeeman spin state basis {(m s =) + 1, 0, −1} in favor of an engineered basis in which the "dressed" eigenstates are less sensitive to environmental noise than the bare spin states [8][9][10][11][12][13][14][15][16]. For an NV center spin qubit, magnetic field fluctuations from nearby paramagnetic impurities and instabilities in a magnetic bias field typically dominate dephasing. A qubit composed of dressed states designed to be more robust to these fluctuations could have a prolonged T * 2 and could be used for precision sensing of quasi-static, nonmagnetic fields such as temperature [17] or strain. For quantum information processing, CDD allows decoupling to continue during gate operations, thus protecting both...

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Decay of the rotary echoes for the spin of a nitrogen-vacancy center in diamond

Cited by 18 publications

References 91 publications

Clock transition by continuous dynamical decoupling of a three-level system

Clock transition by continuous dynamical decoupling of a three-level system

Protecting theSWAPoperation from general and residual errors by continuous dynamical decoupling

Continuous dynamical decoupling of a single diamond nitrogen-vacancy center spin with a mechanical resonator

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