V. V. Dobrovitski
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View article: Heitler effect and resonance fluorescence in quantum magnonics
Heitler effect and resonance fluorescence in quantum magnonics Open
We consider a coupled system of a qubit and a magnon mode in which the qubit is weakly driven. We demonstrate that the spectral steady-state responses of both the qubit and the magnon show, in addition to two sidebands split by the couplin…
View article: Decoherence induced by a sparse bath of two-level fluctuators: Peculiar features of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mn>1</mml:mn><mml:mo>/</mml:mo><mml:mi>f</mml:mi></mml:mrow></mml:math> noise in high-quality qubits
Decoherence induced by a sparse bath of two-level fluctuators: Peculiar features of noise in high-quality qubits Open
Progress in fabrication of semiconductor and superconductor qubits has greatly diminished the number of decohering defects, thus decreasing the devastating low-frequency 1/f noise and extending the qubits' coherence times (dephasing time T…
View article: Efficient and robust estimation of many-qubit Hamiltonians
Efficient and robust estimation of many-qubit Hamiltonians Open
Characterizing the interactions and dynamics of quantum mechanical systems is an essential task in developing quantum technologies. We propose an efficient protocol based on the estimation of the time-derivatives of few qubit observables u…
View article: Long-lived coherences in strongly interacting spin ensembles
Long-lived coherences in strongly interacting spin ensembles Open
Periodic driving has emerged as a powerful tool to control, engineer, and characterize many-body quantum systems. However, the required pulse sequences are often complex, long, or require the ability to control the individual degrees of fr…
View article: Coherent Control of a Nuclear Spin via Interactions with a Rare-Earth Ion in the Solid State
Coherent Control of a Nuclear Spin via Interactions with a Rare-Earth Ion in the Solid State Open
Individually addressed Er3+ ions in solid-state hosts are promising resources for quantum repeaters, because of their direct emission in the telecom band and their compatibility with silicon photonic devices. While the Er3+ electron spin p…
View article: Probing Spin Dynamics on Diamond Surfaces Using a Single Quantum Sensor
Probing Spin Dynamics on Diamond Surfaces Using a Single Quantum Sensor Open
Understanding the dynamics of a quantum bit's environment is essential for the realization of practical systems for quantum information processing and metrology. We use single nitrogen-vacancy (NV) centers in diamond to study the dynamics …
View article: Coherent control of a nuclear spin via interactions with a rare-earth ion in the solid-state
Coherent control of a nuclear spin via interactions with a rare-earth ion in the solid-state Open
Individually addressed Er$^{3+}$ ions in solid-state hosts are promising resources for quantum repeaters, because of their direct emission in the telecom band and compatibility with silicon photonic devices. While the Er$^{3+}$ electron sp…
View article: Efficient and robust estimation of many-qubit Hamiltonians
Efficient and robust estimation of many-qubit Hamiltonians Open
Characterizing the interactions and dynamics of quantum mechanical systems is an essential task in the development of quantum technologies. We propose an efficient protocol based on the estimation of the time derivatives of few qubit obser…
View article: Long-lived coherence in driven many-spin systems: from two to infinite spatial dimensions
Long-lived coherence in driven many-spin systems: from two to infinite spatial dimensions Open
Long-lived coherences, emerging under periodic pulse driving in the disordered ensembles of strongly interacting spins, offer immense advantages for future quantum technologies, but the physical origin and the key properties of this phenom…
View article: Probing spin dynamics on diamond surfaces using a single quantum sensor
Probing spin dynamics on diamond surfaces using a single quantum sensor Open
Understanding the dynamics of a quantum bit's environment is essential for the realization of practical systems for quantum information processing and metrology. We use single nitrogen-vacancy (NV) centers in diamond to study the dynamics …
View article: Orbital and Spin Dynamics of Single Neutrally-Charged Nitrogen-Vacancy Centers in Diamond
Orbital and Spin Dynamics of Single Neutrally-Charged Nitrogen-Vacancy Centers in Diamond Open
The neutral charge state plays an important role in quantum information and sensing applications based on nitrogen-vacancy centers. However, the orbital and spin dynamics remain unexplored. Here, we use resonant excitation of single center…
View article: Thermalization in Solid-State NMR Controlled by Quantum Chaos in Spin Bath
Thermalization in Solid-State NMR Controlled by Quantum Chaos in Spin Bath Open
We theoretically investigate thermalization and spin diffusion driven by a quantum spin bath for a realistic solid-state NMR experiment. We consider polycrystalline L-alanine, and investigate how the spin polarization spreads among several…
View article: Spin Lifetime and Charge Noise in Hot Silicon Quantum Dot Qubits
Spin Lifetime and Charge Noise in Hot Silicon Quantum Dot Qubits Open
We investigate the magnetic field and temperature dependence of the single-electron spin lifetime in silicon quantum dots and find a lifetime of 2.8 ms at a temperature of 1.1 K. We develop a model based on spin-valley mixing and find that…
View article: Quantum dynamics of nuclear spins and spin relaxation in organic semiconductors
Quantum dynamics of nuclear spins and spin relaxation in organic semiconductors Open
3D printing of materials with active functional groups can provide custom-designed structures that promote chemical conversions. Herein, catalytically active architectures were produced by photopolymerizing bifunctional molecules using a c…
View article: Polaron spin echo envelope modulations in an organic semiconducting polymer
Polaron spin echo envelope modulations in an organic semiconducting polymer Open
Here, we present a theoretical analysis of the electron spin echo envelope modulation (ESEEM) spectra of polarons in semiconducting π -conjugated polymers. We show that the contact hyperfine coupling and the dipolar interaction between the…
View article: Absorption spectrum of a two-level system subjected to a periodic pulse sequence
Absorption spectrum of a two-level system subjected to a periodic pulse sequence Open
We investigate how the quantum control of a two-level system (TLS) coupled to\nphotons can modify and tune the TLS's photon absorption spectrum. Tuning and\ncontrolling the emission and the absorption is of much interest e.g.\\ for the\nde…
View article: Gate fidelity and coherence of an electron spin in an Si/SiGe quantum dot with micromagnet
Gate fidelity and coherence of an electron spin in an Si/SiGe quantum dot with micromagnet Open
Significance A quantum computer is able to solve certain problems that cannot be solved by a classical computer within a reasonable time. The building block of a quantum computer is called a quantum bit (qubit), the counterpart of the conv…
View article: Suppressing Spectral Diffusion of Emitted Photons with Optical Pulses
Suppressing Spectral Diffusion of Emitted Photons with Optical Pulses Open
In many quantum architectures the solid-state qubits, such as quantum dots or color centers, are interfaced via emitted photons. However, the frequency of photons emitted by solid-state systems exhibits slow uncontrollable fluctuations ove…