scholarly journals Erratum: Corrigendum: Quantum State Transmission in a Superconducting Charge Qubit-Atom Hybrid

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Deshui Yu ◽  
María Martínez Valado ◽  
Christoph Hufnagel ◽  
Leong Chuan Kwek ◽  
Luigi Amico ◽  
...  
Keyword(s):  
Quantum State ◽  
Charge Qubit ◽  
State Transmission

scholarly journals Quantum State Transmission in a Superconducting Charge Qubit-Atom Hybrid

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Deshui Yu ◽  
María Martínez Valado ◽  
Christoph Hufnagel ◽  
Leong Chuan Kwek ◽  
Luigi Amico ◽  
...  
Keyword(s):  
Quantum State ◽  
High Speed ◽  
Rydberg Atom ◽  
Hybrid Structure ◽  
Spectroscopic Techniques ◽  
Charge Qubit ◽  
Superconducting Device ◽  
Long Time ◽  
State Transmission ◽  
Atomic States

Abstract Hybrids consisting of macroscopic superconducting circuits and microscopic components, such as atoms and spins, have the potential of transmitting an arbitrary state between different quantum species, leading to the prospective of high-speed operation and long-time storage of quantum information. Here we propose a novel hybrid structure, where a neutral-atom qubit directly interfaces with a superconducting charge qubit, to implement the qubit-state transmission. The highly-excited Rydberg atom located inside the gate capacitor strongly affects the behavior of Cooper pairs in the box while the atom in the ground state hardly interferes with the superconducting device. In addition, the DC Stark shift of the atomic states significantly depends on the charge-qubit states. By means of the standard spectroscopic techniques and sweeping the gate voltage bias, we show how to transfer an arbitrary quantum state from the superconducting device to the atom and vice versa.

scholarly journals Superconductor qubits hamiltonian approximations effect on quantum state evolution and control

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Javad Sharifi
Keyword(s):  
Quantum State ◽  
Charge Qubit ◽  
Gate Operation ◽  
Goal State ◽  
Expected Time ◽  
State Evolution ◽  
Angle Of Deviation ◽  
Hadamard Gate ◽  
Phase Qubit ◽  
And Control

AbstractMicrowave IQ-mixer controllers are designed for the three approximated Hamiltonians of charge, phase and flux qubits and the controllers are exerted both on approximate and precise quantum system models. The controlled qubits are for the implementation of the two quantum-gates with these three fundamental types of qubits, Quantum NOT-gate and Hadamard-gate. In the charge-qubit, for implementation of both gates, in the approximated and precise model, we observed different controlled trajectories. But fortunately, applying the controller designed for the approximated system over the precise system leads to the passing of the quantum state from the desired state sooner that the expected time. Phase-qubit and flux qubit have similar behaviour under the control system action. In both of them, the implementation of NOT-gate operation led to same trajectories which arrive at final goal state at different times. But in both of those two qubits for implementation of Hadamard-gate, desired trajectory and precise trajectory have some angle of deviation, then by exerting the approximated design controller to precise system, it caused the quantum state to approach the goal state for Hadamard gate implementation, and since the quantum state does not completely reach the goal state, we can not obtain very high gate fidelity.

Quantum state transmission through a spin chain in finite-temperature heat baths

2021 ◽  
Vol 54 (15) ◽  
pp. 155303
Author(s):  
Zhao-Ming Wang ◽  
Feng-Hua Ren ◽  
Da-Wei Luo ◽  
Zhan-Yuan Yan ◽  
Lian-Ao Wu
Keyword(s):  
Quantum State ◽  
Finite Temperature ◽  
Spin Chain ◽  
Temperature Heat ◽  
State Transmission

A universal protocol for controlled bidirectional quantum state transmission

2019 ◽  
Vol 18 (9) ◽  
Author(s):  
Yi-Ru Sun ◽  
Nan Xiang ◽  
Zhao Dou ◽  
Gang Xu ◽  
Xiu-Bo Chen ◽  
...  
Keyword(s):  
Quantum State ◽  
State Transmission ◽  
Universal Protocol

Shortcut to nonadiabatic quantum state transmission

2016 ◽  
Vol 93 (6) ◽  
Author(s):  
Zhao-Ming Wang ◽  
C. Allen Bishop ◽  
Jun Jing ◽  
Yong-Jian Gu ◽  
Christian Garcia ◽  
...  
Keyword(s):  
Quantum State ◽  
State Transmission

scholarly journals Preparation of a superposition of squeezed coherent states of a cavity field via coupling to a superconducting charge qubit

2020 ◽  
Vol 16 ◽  
pp. 1
Author(s):  
Dagoberto S. Freitas
Keyword(s):  
Radiation Field ◽  
Quantum State ◽  
Coherent States ◽  
Unitary Transformation ◽  
Quantum Communication ◽  
Quantum States ◽  
Cavity Field ◽  
Nonclassical States ◽  
Charge Qubit ◽  
The Past

The generation of nonclassical states of a radiation field has become increasingly important in the past years given its various applications in quantum communication. It has been recently proposed a way to engineer quantum states using a SQUID charge qubit inside a cavity with a controllable interaction between the cavity field and the charge qubit. Since decoherence is known to affect quantum effects uninterruptedly and decoherence process are working even when the quantum state is being formed, therefore, is interesting to envisage processes through which quantum superpositions are generated as fast as possible. We succeed in linearizing the Hamiltonian of the system through the application of an appropriate unitary transformation and for certain values of the parameters involved, we show that it is possible to obtain specific Hamiltonians. In this work we will use this approach for preparing superposition of two squeezed coherent states.

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