High-resolution resonant excitation of NV centers in 6H−SiC : A matrix for quantum technology applications

2019 ◽  
Vol 100 (20) ◽  
Author(s):  
Kh. Khazen ◽  
H. J. von Bardeleben ◽  
S. A. Zargaleh ◽  
J. L. Cantin ◽  
Mu Zhao ◽  
...  
Keyword(s):  
High Resolution ◽  
Resonant Excitation ◽  
Technology Applications ◽  
Quantum Technology ◽  
Nv Centers

Demonstration of sub-micron hot vapor cells for quantum technology applications

2020 ◽  
Author(s):  
Eliran Talker ◽  
Roy Zektzer ◽  
Yefim Barash ◽  
Noa Mazurski ◽  
Uriel Levy
Keyword(s):  
Vapor Cells ◽  
Technology Applications ◽  
Quantum Technology

scholarly journals Few-qubit quantum refrigerator for cooling a multi-qubit system

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Onat Arısoy ◽  
Özgür E. Müstecaplıoğlu
Keyword(s):  
Quantum Computing ◽  
Interaction Strength ◽  
Refrigeration Cycle ◽  
Cooling Efficiency ◽  
Star Model ◽  
Qubit System ◽  
Technology Applications ◽  
Ferromagnetic Ising Model ◽  
Quantum Technology ◽  
Operation Cost

AbstractWe propose to use a few-qubit system as a compact quantum refrigerator for cooling an interacting multi-qubit system. We specifically consider a central qubit coupled to N ancilla qubits in a so-called spin-star model to be used as refrigerant by means of short interactions with a many-qubit system to be cooled. We first show that if the interaction between the qubits is of the longitudinal and ferromagnetic Ising model form, the central qubit is colder than the environment. We summarize how preparing the refrigerant qubits using the spin-star model paves the way for the cooling of a many-qubit system by means of a collisional route to thermalization. We discuss a simple refrigeration cycle, considering the operation cost and cooling efficiency, which can be controlled by N and the qubit–qubit interaction strength. Besides, bounds on the achievable temperature are established. Such few-qubit compact quantum refrigerators can be significant to reduce dimensions of quantum technology applications, can be easy to integrate into all-qubit systems, and can increase the speed and power of quantum computing and thermal devices.

scholarly journals Robust all-optical single-shot readout of nitrogen-vacancy centers in diamond

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Dominik M. Irber ◽  
Francesco Poggiali ◽  
Fei Kong ◽  
Michael Kieschnick ◽  
Tobias Lühmann ◽  
...  
Keyword(s):  
Cryogenic Temperature ◽  
High Efficiency ◽  
Resonant Excitation ◽  
Nitrogen Vacancy ◽  
Single Shot ◽  
Quantum Protocols ◽  
All Optical ◽  
Nitrogen Vacancy Centers ◽  
Nv Centers ◽  
Photon Collection

AbstractHigh-fidelity projective readout of a qubit’s state in a single experimental repetition is a prerequisite for various quantum protocols of sensing and computing. Achieving single-shot readout is challenging for solid-state qubits. For Nitrogen-Vacancy (NV) centers in diamond, it has been realized using nuclear memories or resonant excitation at cryogenic temperature. All of these existing approaches have stringent experimental demands. In particular, they require a high efficiency of photon collection, such as immersion optics or all-diamond micro-optics. For some of the most relevant applications, such as shallow implanted NV centers in a cryogenic environment, these tools are unavailable. Here we demonstrate an all-optical spin readout scheme that achieves single-shot fidelity even if photon collection is poor (delivering less than 103 clicks/second). The scheme is based on spin-dependent resonant excitation at cryogenic temperature combined with spin-to-charge conversion, mapping the fragile electron spin states to the stable charge states. We prove this technique to work on shallow implanted NV centers, as they are required for sensing and scalable NV-based quantum registers.

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