Randomization of Pulse Phases for Unambiguous and Robust Quantum Sensing.

  title={Randomization of Pulse Phases for Unambiguous and Robust Quantum Sensing.},
  author={Zhenyu Wang and J. E. Lang and Simon Schmitt and Johannes Lang and Jorge Casanova and Liam P McGuinness and Tania S. Monteiro and Fedor Jelezko and Martin Bodo Plenio},
  journal={Physical review letters},
  volume={122 20},
We develop theoretically and demonstrate experimentally a universal dynamical decoupling method for robust quantum sensing with unambiguous signal identification. Our method uses randomization of control pulses to simultaneously suppress two types of errors in the measured spectra that would otherwise lead to false signal identification. These are spurious responses due to finite-width π pulses, as well as signal distortion caused by π pulse imperfections. For the cases of nanoscale nuclear… 

Figures from this paper

Enhancing the Robustness of Dynamical Decoupling Sequences with Correlated Random Phases
By correlating the relative phases of basic pulse units in dynamical decoupling sequences, this work is able to improve the suppression of the signal distortion due to $\pi$ pulse imperfections and spurious responses due to finite-width pulses.
Quantum Metrology with Strongly Interacting Spin Systems
Quantum metrology makes use of coherent superpositions to detect weak signals. While in principle the sensitivity can be improved by increasing the density of sensing particles, in practice this
Efficient and robust signal sensing by sequences of adiabatic chirped pulses
We propose a scheme for sensing of an oscillating field in systems with large inhomogeneous broadening and driving field variation by applying sequences of phased, adiabatic, chirped pulses. The
Robust Detection of High-Frequency Signals at the Nanoscale
We present a method relying on shortcuts to adiabaticity to achieve quantum detection of high frequency signals at the nanoscale in a robust manner. More specifically, our protocol delivers tailored
Phase-Adaptive Dynamical Decoupling Methods for Robust Spin-Spin Dynamics in Trapped Ions
Pulsed dynamical decoupling was originally conceived in the context of nuclear magnetic resonance for nuclear spin detection purposes, and here it is demonstrated that the same principles apply for robust quantum information processing in trapped-ion settings.
Hybrid Microwave-Radiation Patterns for High-Fidelity Quantum Gates with Trapped Ions
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
Deep learning enhanced individual nuclear-spin detection
The detection of nuclear spins using individual electron spins has enabled diverse opportunities in quantum sensing and quantum information processing. Proof-of-principle experiments have
Practical Applications of Quantum Sensing: A Simple Method to Enhance the Sensitivity of Nitrogen-Vacancy-Based Temperature Sensors
Nitrogen-vacancy centers in diamond allow measurement of environment properties such as temperature, magnetic and electric fields at nanoscale level, of utmost relevance for several research fields,
Detection of single 13C spins coupled to NV center via dynamical decoupling design
The adjusted Carr–Purcell–Meiboom–Gill (CPMG) sequence is mathematically simulated to obtain the 13C nuclear spin signals coupled to a negatively-charged nitrogen-vacancy (NV−) center in diamond. The
Robust Dynamic Hamiltonian Engineering of Many-Body Spin Systems
A new framework for the robust control of quantum dynamics of strongly interacting many-body systems by utilizing a matrix representation of the Hamiltonian engineering protocol based on time-domain transformations of the Pauli spin operator along the quantization axis to engineer robust target Hamiltonians.


Pulse-phase control for spectral disambiguation in quantum sensing protocols
We present a method to identify spurious signals generated by finite-width pulses in quantum sensing experiments and apply it to recently proposed dynamical decoupling sequences for accurate spectral
Unambiguous nuclear spin detection using an engineered quantum sensing sequence
Empirically engineered quantum sensing sequences that achieve both, enhanced robustness and the simultaneous suppression of higher order harmonic resonances are presented.
Enhanced Resolution in Nanoscale NMR via Quantum Sensing with Pulses of Finite Duration
The nitrogen-vacancy (N-V) color center in diamond is an enormously important platform for the development of quantum sensors, including for single-spin and single-molecule NMR. Detection of weak
Quantum sensing with arbitrary frequency resolution
Using the electronic spin of a single nitrogen-vacancy center in diamond, detection of oscillating magnetic fields with a frequency resolution of 70 microhertz over a megahertz bandwidth is demonstrated.
Spurious harmonic response of multipulse quantum sensing sequences
Multipulse sequences based on Carr-Purcell decoupling are frequently used for narrow-band signal detection in single spin magnetometry. We have analyzed the behavior of multipulse sensing sequences
Nonvanishing effect of detuning errors in dynamical-decoupling-based quantum sensing experiments
Characteristic dips appear in the coherence traces of a probe qubit when dynamical decoupling (DD) is applied in synchrony with the precession of target nuclear spins, forming the basis for nanoscale
Dynamical decoupling based quantum sensing: Floquet spectroscopy
Sensing the internal dynamics of individual nuclear spins or clusters of nuclear spins has recently become possible by observing the coherence decay of a nearby electronic spin: the weak magnetic
Robust decoupling techniques to extend quantum coherence in diamond.
It is experimentally demonstrate over 2 orders of magnitude increase in the room-temperature coherence time of nitrogen-vacancy centers in diamond by implementing decoupling techniques and shows the experimental importance of using pulse sequences that compensate the imperfections of individual pulses for all input states through judicious choice of the phase of the pulses.
Soft Quantum Control for Highly Selective Interactions among Joint Quantum Systems.
The proposed quantum control scheme allows us to perform an efficient rotating-wave approximation in a wide parameter regime, the elimination of side peaks in quantum sensing experiments, and selective high-fidelity entanglement gates on nuclear spins with close frequencies.
Pulsed dynamical decoupling for fast and robust two-qubit gates on trapped ions
We propose a pulsed dynamical decoupling protocol as the generator of tunable, fast, and robust quantum phase gates between two microwave-driven trapped ion hyperfine qubits. The protocol consists of