scholarly journals Entanglement between charge qubit states and coherent states of nanomechanical resonator generated by ac Josephson effect

2021 ◽  
Vol 47 (4) ◽  
pp. 287-293
Author(s):  
O. M. Bahrova ◽  
L. Y. Gorelik ◽  
S. I. Kulinich
Keyword(s):  
Coherent States ◽  
Josephson Effect ◽  
Charge Qubit ◽  
Nanomechanical Resonator ◽  
Qubit States

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.

scholarly journals Generating the Schrödinger cat state in a nanomechanical resonator coupled to a charge qubit

2014 ◽  
Vol 527 (1-2) ◽  
pp. 180-186 ◽  
Author(s):  
Jian-Qi Zhang ◽  
Wei Xiong ◽  
Shuo Zhang ◽  
Yong Li ◽  
Mang Feng
Keyword(s):  
Charge Qubit ◽  
Nanomechanical Resonator ◽  
Schrödinger Cat ◽  
A Charge ◽  
Schrodinger Cat State

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. 1-6
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.

Entanglement of formation and quantum discord in multipartite j-spin coherent states

2020 ◽  
Vol 34 (26) ◽  
pp. 2050237
Author(s):  
H. Baba ◽  
W. Kaydi ◽  
M. Daoud ◽  
M. Mansour
Keyword(s):  
Coherent States ◽  
Quantum Discord ◽  
Quantum Correlations ◽  
Quantum Systems ◽  
Spin Coherent State ◽  
Entanglement Of Formation ◽  
Multipartite System ◽  
Single Formula ◽  
Qubit States ◽  
Spin Coherent States

We study the entanglement of formation and the quantum discord contained in even and odd multipartite [Formula: see text]-spin coherent states. The key element of this investigation is the fact that a single [Formula: see text]-spin coherent state is viewed as comprising [Formula: see text] qubit states. We compute the quantum correlations present in the n even and odd [Formula: see text]-spin coherent states by considering all possible bipartite splits of the multipartite system. We discuss the different bi-partition schemes of quantum systems and we examine in detail the conservation rules governing the distribution of quantum correlations between the different qubits of the multipartite system. Finally, we derive the explicit expressions of quantum correlations present in even and odd spin coherent states decomposed in four spin sub-systems. We also analyze the properties of monogamy and we show in particular that the entanglement of the formation and the quantum discord obey the relation of monogamy only for even multipartite [Formula: see text]-spin coherent states.

Storage of arbitrary two-charge-qubit states in a singleRb87cold-atom ensemble

2010 ◽  
Vol 82 (3) ◽  
Author(s):  
Z. J. Deng ◽  
Q. Xie ◽  
C. W. Wu ◽  
W. L. Yang
Keyword(s):  
Charge Qubit ◽  
Qubit States
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