32 citations · 203 across the 23 of their papers we have counts for
21 papers · 1 filter
Strong coherent ion-electron coupling using a wire data bus
Baiyi Yu, Ralf Betzholz, Jianming Cai
Ion-ion coupling over long distances represents a highly useful resource for quantum technologies, for example, to sympathetically cool or interconnect qubits in ion-based quantum-…
Two-photon-transition superadiabatic passage in an nitrogen-vacancy center in diamond
Musang Gong, Min Yu, Yaoming Chu +6
Reaching a given target quantum state with high fidelity and fast operation speed close to the quantum limit represents an important goal in quantum information science. Here, we e…
Effective description of cooling and thermal shifts in quantum systems coupled to bosonic modes
Simon B. Jäger, Ralf Betzholz
Recently, an effective Lindblad master equation for quantum systems whose dynamics are coupled to dissipative bosonic modes has been introduced [Phys. Rev. Lett. 129, 063601 (2022)…
Engineering artificial atomic systems of giant electric dipole moment
Baiyi Yu, Yaoming Chu, Ralf Betzholz +2
The electric dipole moment (EDM) plays a crucial role in determining the interaction strength of an atom with electric fields, making it paramount to quantum technologies based on…
Accelerated quantum control in a three-level system by jumping along the geodesics
Musang Gong, Min Yu, Ralf Betzholz +4
In a solid-state spin system, we experimentally demonstrate a protocol for quantum-state population transfer with an improved efficiency compared to traditional stimulated Raman ad…
Real-time adaptive sensing of nuclear spins by a single-spin quantum sensor
Jingcheng Wang, Dongxiao Li, Ralf Betzholz +1
Quantum sensing is considered to be one of the most promising subfields of quantum information to deliver practical quantum advantages in real-world applications. However, its impr…
Robustness of random-control quantum-state tomography
Jingcheng Wang, Shaoliang Zhang, Jianming Cai +3
In a recently demonstrated quantum-state tomography scheme [Phys. Rev. Lett. 124, 010405 (2020)], a random control field is locally applied to a multipartite system to reconstruct…
Lindblad master equations for quantum systems coupled to dissipative bosonic modes
Simon B. Jäger, Tom Schmit, Giovanna Morigi +2
We present a general approach to derive Lindblad master equations for a subsystem whose dynamics is coupled to dissipative bosonic modes. The derivation relies on a Schrieffer-Wolf…
Pulsed characteristic-function measurement of a thermalizing harmonic oscillator
Ralf Betzholz, Yu Liu, Jianming Cai
We present a method for the direct measurement of the Wigner characteristic function of a thermalizing harmonic oscillator that is completely inaccessible for control or measuremen…
Quantum optimal control using phase-modulated driving fields
Jiazhao Tian, Haibin Liu, Yu Liu +5
Quantum optimal control represents a powerful technique to enhance the performance of quantum experiments by engineering the controllable parameters of the Hamiltonian. However, th…
Breakdown signatures of the phenomenological Lindblad master equation in the strong optomechanical coupling regime
Ralf Betzholz, Bruno G. Taketani, Juan Mauricio Torres
The Lindblad form of the master equation has proven to be one of the most convenient ways to describe the impact of an environment interacting with a quantum system of interest. Fo…
Complete Quantum-State Tomography with a Local Random Field
Pengcheng Yang, Min Yu, Ralf Betzholz +2
Single-qubit measurements are typically insufficient for inferring arbitrary quantum states of a multi-qubit system. We show that if the system can be fully controlled by driving a…
Nanotube Double Quantum Dot Spin Transducer for Scalable Quantum Information Processing
Wanlu Song, Tianyi Du, Haibin Liu +2
One of the key challenges for the implementation of scalable quantum information processing is the design of scalable architectures that support coherent interaction and entangleme…
Pulsed Quantum-State Reconstruction of Dark Systems
Yu Liu, Jiazhao Tian, Ralf Betzholz +1
We propose a novel strategy to reconstruct the quantum state of dark systems, i.e., degrees of freedom that are not directly accessible for measurement or control. Our scheme relie…
Scalable nuclear-spin entanglement mediated by a mechanical oscillator
Puhao Cao, Ralf Betzholz, Jianming Cai
We propose a solid-state hybrid platform based on an array of implanted nitrogen-vacancy (NV) centers in diamond magnetically coupled to a mechanical oscillator. The mechanical osc…
Optomechanical damping basis
Juan Mauricio Torres, Ralf Betzholz, Marc Bienert
We present a closed-form analytical solution to the eigenvalue problem of the Liouville operator generating the dissipative dynamics of the standard optomechanical system. The corr…
Entangling distant solid-state spins via thermal phonons
Puhao Cao, Ralf Betzholz, Shaoliang Zhang +1
The implementation of quantum entangling gates between qubits is essential to achieve scalable quantum computation. Here, we propose a robust scheme to realize an entangling gate f…
Laser and cavity cooling of a mechanical resonator with a Nitrogen-Vacancy center in diamond
Luigi Giannelli, Ralf Betzholz, Laura Kreiner +2
We theoretically analyse the cooling dynamics of a high-Q mode of a mechanical resonator, when the structure is also an optical cavity and is coupled with a NV center. The NV cente…
Resonance fluorescence of a laser cooled atom in a non-harmonic potential
Ralf Betzholz, Marc Bienert
We investigate a single laser driven atom trapped in a non-harmonic potential. We present the performance of ground-state laser cooling and Doppler cooling and the signatures of th…
Suppression of Rabi oscillations in hybrid optomechanical systems
Timo Holz, Ralf Betzholz, Marc Bienert
In a hybrid optomechanical setup consisting of a two-level atom in a cavity with a pendular end-mirror, the interplay between the light field's radiation pressure on the mirror and…
Quantum optical master equation for solid-state quantum emitters
Ralf Betzholz, Juan Mauricio Torres, Marc Bienert
We provide an elementary description of the dynamics of defect centers in crystals in terms of a quantum optical master equation which includes spontaneous decay and a simplified v…