Modulated Continuous Wave Control for Energy-Efficient Electron-Nuclear Spin Coupling

Casanova, Jorge; Torrontegui, E.; Plenio, Martin B.; García-Ripoll, Juan José; Solano, E.

doi:10.1103/physrevlett.122.010407

Cited by 20 publications

(15 citation statements)

References 55 publications

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“…In particular, inspired by results in Refs. [35,36], our method involves phase-modulated drivings, phase flips, and refocusing π pulses leading to highfidelity entangling gates within current experimental limitations. We numerically test the performance of our gates in the presence of magnetic fluctuations of different intensities, deviations on the MW Rabi frequencies, as well as under motional heating.…”

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confidence: 99%

Hybrid Microwave-Radiation Patterns for High-Fidelity Quantum Gates with Trapped Ions

et al. 2020

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We present a method that combines continuous and pulsed microwave radiation patterns to achieve robust interactions among hyperfine trapped ions placed in a magnetic field gradient. More specifically, our scheme displays continuous microwave drivings with modulated phases, phase flips, and π pulses. This leads to highfidelity entangling gates which are resilient against magnetic field fluctuations, changes on the microwave amplitudes, and crosstalk effects. Our protocol runs with arbitrary values of microwave power, which includes the technologically relevant case of low microwave intensities. We demonstrate the performance of our method with detailed numerical simulations that take into account the main sources of decoherence.

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confidence: 99%

Hybrid Microwave-Radiation Patterns for High-Fidelity Quantum Gates with Trapped Ions

et al. 2020

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“…Continuous and pulsed (or stroboscopic) DD schemes are typically considered. While the former requires to fulfill the Hartmann-Hahn condition 22,23 , the latter uses the time spacing among π pulses to induce a rotation frequency in the NV matching that of the target signal 24 . Pulsed DD schemes have advantages over continuous DD methods such as the achievement of enhanced frequency selectivity by using large harmonics of the generated modulation function 24,25 .…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, our protocol can be incorporated to standard pulsed DD sequences such as the widely used XY-8 sequence, demonstrating its flexibility. We note that a different approach based on a specific continuous DD method 23 has been proposed to operate with NV centers under large B z fields.…”

Section: Introductionmentioning

confidence: 99%

Selective hybrid spin interactions with low radiation power

2019

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We present a protocol for designing appropriately extended π pulses that achieves tunable, thus selective, electron-nuclear spin interactions with low-driving radiation power. The latter is of great benefit when π pulses are displayed over biological samples as it reduces sample heating. Our method is general since it can be applied to different quantum sensor devices such as nitrogen vacancy centers or silicon vacancy centers. Furthermore, it can be directly incorporated in commonly used stroboscopic dynamical decoupling techniques to achieve enhanced nuclear selectivity and control, which demonstrates its flexibility.

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“…Furthermore, DQM techniques do not introduce a magnetic field gradient on the studied sample, which avoids inhomogeneous broadening in the measured spectrum [32]. Especially interesting for nanoscale NMR is the regime of large static magnetic fields [30,[39][40][41]. Under these conditions, a large chemical shift is present [30], while the relaxation times of sensor and nuclei get enhanced [42].…”

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Double quantum magnetometry at large static magnetic fields

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We present a protocol to achieve double quantum magnetometry at large static magnetic fields. This is a regime where sensitive sample parameters, such as the chemical shift, get enhanced facilitating their characterization. In particular, our method delivers two-tone stroboscopic radiation patterns with modulated Rabi frequencies to achieve larger spectral signals. Furthermore, it does not introduce inhomogeneous broadening in the sample spectrum preventing signal misinterpretation. Moreover, our protocol is designed to work under realistic conditions such as the presence of moderate microwave power and errors on the radiation fields. Albeit we particularise to nitrogen vacancy centers, our protocol is general, thus applicable to distinct quantum sensors.Introduction-The detection of magnetic signals emitted by spin ensembles is central in nanoscale nuclear magnetic resonance (nanoscale NMR) [1]. Here, the hyperfine quantum state of a sensor such as the nitrogen vacancy (NV) center in diamond [2,3] gets modified owing to the interaction with a nuclear or electronic target, leading to quantum sensing or quantum detection [4,6]. To this end, the NV center quantum state is initialised and measured with a laser field, while it can be readily controlled with microwave (MW) radiation [2,3]. In addition, the NV center presents quantum coherence, as well as a long decay time of the order of milliseconds, even at room temperature [5]. These are capacities that make NV centers in diamond ideal candidates for experiments at physiological conditions [6]. The coupling of the NV center with a target signal is typically conducted trough dynamical decoupling (DD) techniques [7] that, in addition, are able to remove noisy contributions over the sensor. Typically, continuous and pulsed (or stroboscopic) DD techniques are considered. The former relies on the Hartmann-Hahn resonance condition [8], while certain stroboscopic DD radiation patterns, as those of the XY family [9-15], show a superior level of robustness against errors on the control fields. First experiments with NV centers were able to detect a classical electromagnetic field [16], while individual 13 C nuclear spin emitters embedded in the diamond lattice have been identified with unprecedented resolution [17][18][19][20][21][22][23][24]. In addition, nanoscale NMR of small volume samples of the order of picolitres, as well as of single molecules located external to the diamond lattice, have been achieved with single NV centers [25][26][27][28][29][30] and with NV ensembles [31,32].Several developments have been carried out to overcome the poor spectral resolution achievable with NV quantum sensors at room temperature. Among them, we have the combination of NV-based quantum detection with the presence of a quantum memory [33], or by synchronising NV measurements with a classical clock [32,34,35]. These hybrid techniques have allowed the detection of coherent target signals with a frequency resolution of the order of few hertz with NV centers. Here, it is important to r...

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Modulated Continuous Wave Control for Energy-Efficient Electron-Nuclear Spin Coupling

Cited by 20 publications

References 55 publications

Hybrid Microwave-Radiation Patterns for High-Fidelity Quantum Gates with Trapped Ions

Hybrid Microwave-Radiation Patterns for High-Fidelity Quantum Gates with Trapped Ions

Selective hybrid spin interactions with low radiation power

Double quantum magnetometry at large static magnetic fields

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