scholarly journals Coherent acoustic control of a single silicon vacancy spin in diamond

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Smarak Maity ◽  
Linbo Shao ◽  
Stefan Bogdanović ◽  
Srujan Meesala ◽  
Young-Ik Sohn ◽  
...  
Keyword(s):  
Quantum Systems ◽  
Phonon Coupling ◽  
Single Spin ◽  
Silicon Vacancy ◽  
Acoustic Control ◽  
State Point ◽  
Hybrid Quantum Systems ◽  
Universal Quantum ◽  
Vacancy Center ◽  
Strong Spin

AbstractPhonons are considered to be universal quantum transducers due to their ability to couple to a wide variety of quantum systems. Among these systems, solid-state point defect spins are known for being long-lived optically accessible quantum memories. Recently, it has been shown that inversion-symmetric defects in diamond, such as the negatively charged silicon vacancy center (SiV), feature spin qubits that are highly susceptible to strain. Here, we leverage this strain response to achieve coherent and low-power acoustic control of a single SiV spin, and perform acoustically driven Ramsey interferometry of a single spin. Our results demonstrate an efficient method of spin control for these systems, offering a path towards strong spin-phonon coupling and phonon-mediated hybrid quantum systems.

scholarly journals Observation of parity-time symmetry breaking in a single-spin system

Science ◽  
2019 ◽  
Vol 364 (6443) ◽  
pp. 878-880 ◽  
Author(s):  
Yang Wu ◽  
Wenquan Liu ◽  
Jianpei Geng ◽  
Xingrui Song ◽  
Xiangyu Ye ◽  
...  
Keyword(s):  
Quantum Systems ◽  
Spin Systems ◽  
Nitrogen Vacancy ◽  
Single Quantum ◽  
Single Spin ◽  
Classical Systems ◽  
Time Symmetry ◽  
Nitrogen Vacancy Center ◽  
Quantum Sensing ◽  
Vacancy Center

Steering the evolution of single spin systems is crucial for quantum computing and quantum sensing. The dynamics of quantum systems has been theoretically investigated with parity-time–symmetric Hamiltonians exhibiting exotic properties. Although parity-time symmetry has been explored in classical systems, its observation in a single quantum system remains elusive. We developed a method to dilate a general parity-time–symmetric Hamiltonian into a Hermitian one. The quantum state evolutions ranging from regions of unbroken to broken PT symmetry have been observed with a single nitrogen-vacancy center in diamond. Owing to the universality of the dilation method, our result provides a route for further exploiting and understanding the exotic properties of parity-time symmetric Hamiltonian in quantum systems.

Absorption of magnons in dispersively coupled hybrid quantum systems

2021 ◽  
Vol 103 (6) ◽  
Author(s):  
Zeng-Xing Liu ◽  
Hao Xiong ◽  
Mu-Ying Wu ◽  
Yong-qing Li
Keyword(s):  
Quantum Systems ◽  
Hybrid Quantum Systems

scholarly journals Simulating molecules on a cloud-based 5-qubit IBM-Q universal quantum computer

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
S. Leontica ◽  
F. Tennie ◽  
T. Farrow
Keyword(s):  
Quantum System ◽  
Energy Transport ◽  
Quantum Computer ◽  
Complex Molecule ◽  
Dissipative System ◽  
Quantum Simulation ◽  
Quantum Systems ◽  
Molecular Structures ◽  
Unitary Evolution ◽  
Universal Quantum

AbstractSimulating the behaviour of complex quantum systems is impossible on classical supercomputers due to the exponential scaling of the number of quantum states with the number of particles in the simulated system. Quantum computers aim to break through this limit by using one quantum system to simulate another quantum system. Although in their infancy, they are a promising tool for applied fields seeking to simulate quantum interactions in complex atomic and molecular structures. Here, we show an efficient technique for transpiling the unitary evolution of quantum systems into the language of universal quantum computation using the IBM quantum computer and show that it is a viable tool for compiling near-term quantum simulation algorithms. We develop code that decomposes arbitrary 3-qubit gates and implement it in a quantum simulation first for a linear ordered chain to highlight the generality of the approach, and second, for a complex molecule. We choose the Fenna-Matthews-Olsen (FMO) photosynthetic protein because it has a well characterised Hamiltonian and presents a complex dissipative system coupled to a noisy environment that helps to improve the efficiency of energy transport. The method can be implemented in a broad range of molecular and other simulation settings.

Universal quantum computation with quantum-dot cellular automata in decoherence-free subspace

2008 ◽  
Vol 8 (10) ◽  
pp. 977-985
Author(s):  
Z.-Y. Xu ◽  
M. Feng ◽  
W.-M. Zhang
Keyword(s):  
Cellular Automata ◽  
Quantum Dot ◽  
Quantum Computation ◽  
Two Dimensions ◽  
High Fidelity ◽  
Electron Pairs ◽  
Quantum Dot Cellular Automata ◽  
Single Spin ◽  
Universal Quantum ◽  
Decoherence Free Subspace

We investigate the possibility to have electron-pairs in decoherence-free subspace (DFS), by means of the quantum-dot cellular automata (QCA) and single-spin rotations, to deterministically carry out a universal quantum computation with high-fidelity. We show that our QCA device with electrons tunneling in two dimensions is very suitable for DFS encoding, and argue that our design favors a scalable quantum computation robust to collective dephasing errors.

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