J. Casanova
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View article: Microscale sensing with strongly interacting NV ensembles at high fields
Microscale sensing with strongly interacting NV ensembles at high fields Open
Advances in sensing devices that utilize nitrogen-vacancy (NV) center ensembles in diamond are driving progress in microscale nuclear magnetic resonance spectroscopy. Utilizing quantum sensing techniques in the high-field regime significan…
View article: Pulse sequence design for high field NMR with NV centers in dipolarly coupled samples
Pulse sequence design for high field NMR with NV centers in dipolarly coupled samples Open
Diamond-based quantum sensors have enabled high-resolution NMR spectroscopy at the microscale in scenarios where fast molecular motion averages out dipolar interactions among target nuclei. However, in samples with low-diffusion, ubiquitou…
View article: Enhanced microscale NMR spectroscopy of low-gyromagnetic ratio nuclei via hydrogen transfer
Enhanced microscale NMR spectroscopy of low-gyromagnetic ratio nuclei via hydrogen transfer Open
Chemical shifts and J-couplings are fundamental parameters in NMR spectroscopy, they provide structural information about molecules. Extracting these quantities from isotopes such as carbon or nitrogen results in reduced sensitivity due to…
View article: Quantum Control of Exciton Motion in Electric Field
Quantum Control of Exciton Motion in Electric Field Open
We studied the quantum control of the classical motion of a two-dimensional exciton by optimizing the time-dependent electric field of a stripe-like gate acting on the exciton and inducing its time-dependent quantum dipole moment. We propo…
View article: Robust microwave cavity control for NV ensemble manipulation
Robust microwave cavity control for NV ensemble manipulation Open
Nitrogen-vacancy (NV) center ensembles have the potential to improve a wide range of applications, including nuclear magnetic resonance spectroscopy at the microscale and nanoscale, wide-field magnetometry, and hyperpolarization of nuclear…
View article: Quantum Control of Exciton Motion in Electric Field
Quantum Control of Exciton Motion in Electric Field Open
We study quantum control of classical motion of a two-dimensional exciton by optimizing the time-dependent electric field of a stripe-like gate acting on the exciton and inducing its time-dependent quantum dipole moment. We propose a searc…
View article: Coherent signal detection in the statistical polarization regime enables high-resolution nanoscale NMR spectroscopy
Coherent signal detection in the statistical polarization regime enables high-resolution nanoscale NMR spectroscopy Open
Nitrogen-vacancy (NV) centers in diamond have emerged as quantum sensors capable of detecting nuclear magnetic resonance (NMR) signals at unprecedented length scales, ranging from picoliter sample volumes down to single spins at the diamon…
View article: Regressions on quantum neural networks at maximal expressivity
Regressions on quantum neural networks at maximal expressivity Open
Considering a universal deep neural network organized as a series of nested qubit rotations, accomplished by adjustable data re-uploads we analyze its expressivity. This ability to approximate continuous functions in regression tasks is qu…
View article: Microscale Sensing with Strongly Interacting NV Ensembles at High Fields
Microscale Sensing with Strongly Interacting NV Ensembles at High Fields Open
Advances in sensing devices that utilize nitrogen-vacancy (NV) center ensembles in diamond are driving progress in microscale nuclear magnetic resonance spectroscopy. Utilizing quantum sensing techniques in the high-field regime significan…
View article: Robust microwave cavity control for NV ensemble manipulation
Robust microwave cavity control for NV ensemble manipulation Open
Nitrogen-vacancy (NV) center ensembles have the potential to improve a wide range of applications, including nuclear magnetic resonance spectroscopy at the microscale and nanoscale, wide-field magnetometry, and hyperpolarization of nuclear…
View article: Pulse sequence design for high field NMR with NV centers in dipolarly coupled samples
Pulse sequence design for high field NMR with NV centers in dipolarly coupled samples Open
Diamond-based quantum sensors have enabled high-resolution NMR spectroscopy at the microscale in scenarios where fast molecular motion averages out dipolar interactions among target nuclei. However, in samples with low-diffusion, ubiquitou…
View article: Enhancing polarization transfer from nitrogen-vacancy centers to external nuclear spins via dangling bond mediators
Enhancing polarization transfer from nitrogen-vacancy centers to external nuclear spins via dangling bond mediators Open
The use of nitrogen-vacancy (NV) centers in diamond as a non-invasive platform for hyperpolarizing nuclear spins in molecular samples is a promising area of research with the potential to enhance the sensitivity of nuclear magnetic resonan…
View article: Versatile quadrature antenna for precise control of large electron spin ensembles in diamond
Versatile quadrature antenna for precise control of large electron spin ensembles in diamond Open
We present an easily reproducible inexpensive microwave antenna that can generate a strong and homogeneous magnetic field of arbitrary polarization, which enables fast and coherent control of electron spins over a large volume. Unlike prec…
View article: Amplified nanoscale detection of labeled molecules via surface electrons on diamond
Amplified nanoscale detection of labeled molecules via surface electrons on diamond Open
The detection of individual molecules and their dynamics is a long-standing challenge in the field of nanotechnology. In this work, we present a method that utilizes a nitrogen vacancy (NV) center and a dangling bond on the diamond surface…
View article: Automatic Detection of Nuclear Spins at Arbitrary Magnetic Fields via Signal-to-Image AI Model
Automatic Detection of Nuclear Spins at Arbitrary Magnetic Fields via Signal-to-Image AI Model Open
Quantum sensors leverage matter's quantum properties to enable measurements with unprecedented spatial and spectral resolution. Among these sensors, those utilizing nitrogen-vacancy (NV) centers in diamond offer the distinct advantage of o…
View article: J-coupling NMR Spectroscopy with Nitrogen Vacancy Centers at High Fields
J-coupling NMR Spectroscopy with Nitrogen Vacancy Centers at High Fields Open
A diamond-based sensor utilizing nitrogen-vacancy (NV) center ensembles permits the analysis of micron-sized samples through NMR techniques at room temperature. Current efforts are directed towards extending the operating range of NV cente…
View article: Regressions on quantum neural networks at maximal expressivity
Regressions on quantum neural networks at maximal expressivity Open
We analyze the expressivity of a universal deep neural network that can be organized as a series of nested qubit rotations, accomplished by adjustable data re-uploads. While the maximal expressive power increases with the depth of the netw…
View article: Characterization of the photon emission statistics in nitrogen-vacancy centers
Characterization of the photon emission statistics in nitrogen-vacancy centers Open
We model and experimentally demonstrate the full time-dependent counting statistics of photons emitted by a single nitrogen-vacancy (NV) center in diamond under non-resonant laser excitation and resonant microwave control. A generalization…
View article: Quantum neural networks with multi-qubit potentials
Quantum neural networks with multi-qubit potentials Open
View article: Robust oscillator-mediated phase gates driven by low-intensity pulses
Robust oscillator-mediated phase gates driven by low-intensity pulses Open
Robust qubit-qubit interactions mediated by bosonic modes are central to many quantum technologies. Existing proposals combining fast oscillator-mediated gates with dynamical decoupling require strong pulses or fast control over the qubit-…
View article: Robust two-qubit gates using pulsed dynamical decoupling
Robust two-qubit gates using pulsed dynamical decoupling Open
We present the experimental implementation of a two-qubit phase gate, using a radio frequency (RF) controlled trapped-ion quantum processor. The RF-driven gate is generated by a pulsed dynamical decoupling sequence applied to the ions’ car…
View article: Enhancing polarization transfer from nitrogen-vacancy centers in diamond to external nuclear spins via dangling bond mediators
Enhancing polarization transfer from nitrogen-vacancy centers in diamond to external nuclear spins via dangling bond mediators Open
The use of nitrogen-vacancy centers in diamond as a non-invasive platform for hyperpolarizing nuclear spins in molecular samples is a promising area of research with the potential to enhance the sensitivity of nuclear magnetic resonance ex…
View article: High-Resolution NMR Spectroscopy at Large Fields with Nitrogen Vacancy Centers
High-Resolution NMR Spectroscopy at Large Fields with Nitrogen Vacancy Centers Open
Ensembles of nitrogen-vacancy (NV) centers are used as sensors to detect nuclear magnetic resonance signals from micron-sized samples at room temperature. In this scenario, the regime of large magnetic fields is especially interesting as i…
View article: A neural network assisted 171Yb+ quantum magnetometer
A neural network assisted 171Yb+ quantum magnetometer Open
View article: Neural networks for Bayesian quantum many-body magnetometry
Neural networks for Bayesian quantum many-body magnetometry Open
Entangled quantum many-body systems can be used as sensors that enable the estimation of parameters with a precision larger than that achievable with ensembles of individual quantum detectors. Typically, the parameter estimation strategy r…
View article: Detection of molecular transitions with nitrogen-vacancy centers and electron-spin labels
Detection of molecular transitions with nitrogen-vacancy centers and electron-spin labels Open
View article: Co-Design quantum simulation of nanoscale NMR
Co-Design quantum simulation of nanoscale NMR Open
Quantum computers have the potential to efficiently simulate the dynamics of nanoscale NMR systems. In this work, we demonstrate that a noisy intermediate-scale quantum computer can be used to simulate and predict nanoscale NMR resonances.…
View article: Detection of Molecular Changes with Nitrogen-Vacancy Centers and Electron-Spin Labels.
Detection of Molecular Changes with Nitrogen-Vacancy Centers and Electron-Spin Labels. Open
We present a protocol that detects molecular conformational changes with two nitroxide electron-spin labels and a nitrogen-vacancy (NV) center in diamond. More specifically, we demonstrate that the NV can detect en- ergy shifts induced by …
View article: Robust Two-Qubit Gates Using Pulsed Dynamical Decoupling
Robust Two-Qubit Gates Using Pulsed Dynamical Decoupling Open
We present the experimental implementation of a two-qubit phase gate, using a radio frequency (RF) controlled trapped-ion quantum processor. The RF-driven gate is generated by a pulsed dynamical decoupling sequence applied to the ions' car…
View article: A Neural Network Assisted 171Yb+ Quantum Magnetometer
A Neural Network Assisted 171Yb+ Quantum Magnetometer Open
A versatile magnetometer must deliver a readable response when exposed to target fields in a wide range of parameters. In this work, we experimentally demonstrate that the combination of 171Yb+ atomic sensors with ade…