scholarly journals Electrical control of strong spin-phonon coupling in a carbon nanotube

2017 ◽  
Vol 17 (1&2) ◽  
pp. 117-124
Author(s):  
Fang-Yu Hong ◽  
Jing-Li Fu ◽  
Yan Wu ◽  
Zhi-Yan Zhu
Keyword(s):  
Carbon Nanotube ◽  
Quantum Dot ◽  
Quantum Information Processing ◽  
Phonon Coupling ◽  
Quantum State Transfer ◽  
Spin Qubits ◽  
Electrical Control ◽  
State Transfer ◽  
Electrical Pulses ◽  
Effective Center

We describe an approach to electrically control the strong interaction between a single electron spin and the vibrational motion of a suspended carbon nanotube resonator. The strength of the deflection-induced spin-phonon coupling is dependent on the wavefunction of the electron confined in a lateral carbon nanotube quantum dot. An electrical field along the nanotube shifts the effective center of the quantum dot, leading to the corresponding modification of the spin-phonon strength. Numerical simulations with experimentally reachable parameters show that high fidelity quantum state transfer between mechanical and spin qubits driven by electrical pulses is feasible. Our results form the basis for the fully electrical control of the coherent interconvertion between light and spin qubits and for manufacturing electrically driven quantum information processing systems.

scholarly journals Adiabatic quantum state transfer in a semiconductor quantum-dot spin chain

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Yadav P. Kandel ◽  
Haifeng Qiao ◽  
Saeed Fallahi ◽  
Geoffrey C. Gardner ◽  
Michael J. Manfra ◽  
...  
Keyword(s):  
Quantum Computing ◽  
Quantum Dot ◽  
Quantum State ◽  
Information Transfer ◽  
Full Potential ◽  
Quantum State Transfer ◽  
Spin Qubits ◽  
Semiconductor Quantum Dot ◽  
State Transfer ◽  
Spin Singlet

AbstractSemiconductor quantum-dot spin qubits are a promising platform for quantum computation, because they are scalable and possess long coherence times. In order to realize this full potential, however, high-fidelity information transfer mechanisms are required for quantum error correction and efficient algorithms. Here, we present evidence of adiabatic quantum-state transfer in a chain of semiconductor quantum-dot electron spins. By adiabatically modifying exchange couplings, we transfer single- and two-spin states between distant electrons in less than 127 ns. We also show that this method can be cascaded for spin-state transfer in long spin chains. Based on simulations, we estimate that the probability to correctly transfer single-spin eigenstates and two-spin singlet states can exceed 0.95 for the experimental parameters studied here. In the future, state and process tomography will be required to verify the transfer of arbitrary single qubit states with a fidelity exceeding the classical bound. Adiabatic quantum-state transfer is robust to noise and pulse-timing errors. This method will be useful for initialization, state distribution, and readout in large spin-qubit arrays for gate-based quantum computing. It also opens up the possibility of universal adiabatic quantum computing in semiconductor quantum-dot spin qubits.

scholarly journals Electrically tunable quantum interfaces between photons and spin qubits in carbon nanotube quantum dots

2016 ◽  
Vol 14 (08) ◽  
pp. 1650047
Author(s):  
Ze-Song Shen ◽  
Fang-Yu Hong
Keyword(s):  
Quantum Dots ◽  
Carbon Nanotube ◽  
Quantum Spin ◽  
Spin Qubits ◽  
Local Electron ◽  
Experimental Conditions ◽  
Electrical Control ◽  
Transfer Processes ◽  
State Transfer ◽  
Electrical Manipulation

We present a new scheme for quantum interfaces (QIs) to accomplish the interconversion of photonic qubits and spin qubits based on optomechanical resonators and the spin–orbit-induced interactions in suspended carbon nanotube quantum dots (CNTQDs). This interface implements quantum spin transducers and further enables electrical manipulation of local electron spin qubits, which lays the foundation for all-electrical control of state transfer protocols between two distant quantum nodes in a quantum network. We numerically evaluate the state transfer processes and proceed to estimate the effect of each coupling strength on the operation fidelities. The simulation suggests that high operation fidelities are obtainable under realistic experimental conditions.

scholarly journals Quantum State Transfer from a Single Photon to a Distant Quantum-Dot Electron Spin

2017 ◽  
Vol 119 (6) ◽  
Author(s):  
Yu He ◽  
Yu-Ming He ◽  
Yu-Jia Wei ◽  
Xiao Jiang ◽  
Kai Chen ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Quantum State ◽  
Electron Spin ◽  
Single Photon ◽  
Quantum State Transfer ◽  
State Transfer

scholarly journals Quantum networks: topology and spectral characterization

2018 ◽  
Vol 182 ◽  
pp. 02014
Author(s):  
Vesna Berec
Keyword(s):  
Quantum Information Processing ◽  
Theoretic Approach ◽  
Quantum State Transfer ◽  
Complexity Measures ◽  
Quantum Networks ◽  
Graph Theoretic ◽  
Topological Features ◽  
State Transfer ◽  
Quantum Complexity ◽  
And Control

To utilize a scalable quantum network and perform a quantum state transfer within distant arbitrary nodes, coherence and control of the dynamics of couplings between the information units must be achieved as a prerequisite ingredient for quantum information processing within a hierarchical structure. Graph theoretic approach provides a powerful tool for the characterization of quantum networks with non-trivial clustering properties. By encoding the topological features of the underlying quantum graphs, relations between the quantum complexity measures are presented revealing the intricate links between a quantum and a classical networks dynamics.

Fast quantum state transfer in hybrid quantum dot-metal nanoparticle systems by shaping ultrafast laser pulses

2019 ◽  
Vol 52 (42) ◽  
pp. 425101 ◽  
Author(s):  
Yihong Qi ◽  
Chuan-Cun Shu ◽  
Daoyi Dong ◽  
Ian R Petersen ◽  
Kurt Jacobs ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Quantum State ◽  
Laser Pulses ◽  
Ultrafast Laser ◽  
Metal Nanoparticle ◽  
Quantum State Transfer ◽  
Ultrafast Laser Pulses ◽  
State Transfer

QUANTUM INFORMATION PROCESSING IN AN ARRAY OF SUPERCONDUCTING TRANSMISSION LINE RESONATORS

2009 ◽  
Vol 07 (06) ◽  
pp. 1255-1267
Author(s):  
JIAN LI ◽  
JIAN ZOU ◽  
BIN SHAO
Keyword(s):  
Information Processing ◽  
Quantum Information ◽  
Transmission Line ◽  
Quantum State ◽  
Quantum Information Processing ◽  
Quantum State Transfer ◽  
Superconducting Qubit ◽  
One Dimensional ◽  
Dimensional Array ◽  
State Transfer

We consider a one-dimensional array of superconducting transmission line resonators (TLRs). The TLRs are coupled by current-biased Josephson junctions, which act as tunable couplers between each two nearest TLRs, and a superconducting qubit is fabricated in the center of each TLR. We show that some important quantum information processing, such as quantum state transfer and preparation of remote entanglement, can be achieved in this system, and we also propose a scheme for generating the W-class states.

scholarly journals Quantum information processing with quantum zeno many-body dynamics

2010 ◽  
Vol 10 (3&4) ◽  
pp. 201-222
Author(s):  
A. Monras ◽  
O. Romero-Isart
Keyword(s):  
Quantum Information ◽  
Quantum Information Processing ◽  
Quantum Zeno Effect ◽  
Quantum State Transfer ◽  
Many Body ◽  
One Dimensional ◽  
Zeno Effect ◽  
State Transfer ◽  
Body Dynamics ◽  
Universal Quantum

We show how the quantum Zeno effect can be exploited to control quantum many-body dynamics for quantum information and computation purposes. In particular, we consider a one dimensional array of three level systems interacting via a nearest-neighbour interaction. By encoding the qubit on two levels and using simple projective frequent measurements yielding the quantum Zeno effect, we demonstrate how to implement a well defined quantum register, quantum state transfer on demand, universal two-qubit gates and two-qubit parity measurements. Thus, we argue that the main ingredients for universal quantum computation can be achieved in a spin chain with an {\em always-on} and {\em constant} many-body Hamiltonian. We also show some possible modifications of the initially assumed dynamics in order to create maximally entangled qubit pairs and single qubit gates.

scholarly journals Iterative quantum-state transfer along a chain of nuclear spin qubits

2007 ◽  
Vol 76 (1) ◽  
Author(s):  
Jingfu Zhang ◽  
Nageswaran Rajendran ◽  
Xinhua Peng ◽  
Dieter Suter
Keyword(s):  
Quantum State ◽  
Nuclear Spin ◽  
Quantum State Transfer ◽  
Spin Qubits ◽  
State Transfer ◽  
A Chain
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