Regulation of Entanglement and Geometric Quantum Discord of Hybrid Superconducting Qubits for Circuit QED

2013 ◽  
Vol 52 (9) ◽  
pp. 3220-3228 ◽  
Author(s):  
Ying-Hua Ji ◽  
Yong-Mei Liu
Keyword(s):  
Quantum Discord ◽  
Superconducting Qubits ◽  
Circuit Qed ◽  
Geometric Quantum Discord

STUDY ON QUANTUM CORRELATIONS FOR CIRCUIT QED STATES

2013 ◽  
Vol 27 (13) ◽  
pp. 1350056 ◽  
Author(s):  
Y. H. JI ◽  
Y. M. LIU
Keyword(s):  
Quantum Discord ◽  
Relative Phase ◽  
Photon Number ◽  
Quantum Correlations ◽  
Superconducting Qubits ◽  
Squeezed State ◽  
Cavity Field ◽  
Circuit Qed ◽  
Study Results ◽  
Average Photon Number

We investigate the dynamic evolution behaviors of entanglement and geometric quantum discord of coupled superconducting qubits in circuit QED system. We carefully analyze the effect of cavity field quantum state on the quantum entanglement and quantum correlations dynamic behaviors of coupling superconducting qubits. The results show that when the cavity field is in coherent state, with the average photon number increasing, the quantum discord death (including entanglement death) would become more difficult to appear, that is to say prolonging the survival time of quantum correlations will be a benefit for keeping the quantum correlations. When the cavity field is in squeezed state, the squeezed amplitude parameters are all too big or too small to keep the system quantum correlations. However, the further study results show that with the initial relative phase of coupling superconducting increasing, qubits can also keep the quantum correlations.

Geometry and dynamics of one-norm geometric quantum discord

2015 ◽  
Vol 15 (1) ◽  
pp. 301-326 ◽  
Author(s):  
Zhiming Huang ◽  
Daowen Qiu ◽  
Paulo Mateus
Keyword(s):  
Quantum Discord ◽  
Geometric Quantum Discord

scholarly journals Bogoliubov quasiparticles in superconducting qubits

2021 ◽  
Author(s):  
Leonid Glazman ◽  
Gianluigi Catelani
Keyword(s):  
Information Processing ◽  
Quantum Information ◽  
Adverse Effects ◽  
Quantum Information Processing ◽  
Photon Emission ◽  
Three Dimensional ◽  
Degree Of Freedom ◽  
Superconducting Qubits ◽  
Relaxation Rates ◽  
Circuit Qed

Extending the qubit coherence times is a crucial task in building quantum information processing devices. In the three-dimensional cavity implementations of circuit QED, the coherence of superconducting qubits was improved dramatically due to cutting the losses associated with the photon emission. Next frontier in improving the coherence includes the mitigation of the adverse effects of superconducting quasiparticles. In these lectures, we review the basics of the quasiparticles dynamics, their interaction with the qubit degree of freedom, their contribution to the qubit relaxation rates, and approaches to control their effect.

Dynamics of quantum correlations in a qubit-qutrit spin system under random telegraph noise

2021 ◽  
Author(s):  
Fadwa Benabdallah ◽  
Hamid Arian Zad ◽  
Mohammed Daoud ◽  
Nerses S Ananikian
Keyword(s):  
High Temperatures ◽  
Quantum Discord ◽  
Quantum Correlations ◽  
Spin Model ◽  
Dimensionless Time ◽  
Random Telegraph Noise ◽  
Geometric Quantum Discord ◽  
Logarithmic Negativity ◽  
Telegraph Noise ◽  
Real Complex

Abstract We study the dimensionless time evolution of the logarithmic negativity and geometric quantum discord of a qubit-qutrit XXX spin model under the both Markovian and non-Markovian noise channels. We find that at a special temperature interval the quantum entanglement based on the logarithmic negativity reveals entanglement sudden deaths together with revivals. The revival phenomenon is due to the non-Markovianity resulting from the feedback effect of the environment. At high temperatures, the scenario of death and revival disappears. The geometric quantum discord evolves alternatively versus time elapsing with damped amplitudes until the system reaches steady state. It is demonstrated that the dynamics of entanglement negativity undergoes substantial changes by varying temperature, and it is much more fragile against the temperature rather than the geometric quantum discord. The real complex heterodinuclear [Ni(dpt (H2O)Cu(pba)]·2H2O [with pba =1,3-propylenebis(oxamato) and dpt = bis-(3-aminopropyl)amine] is an experimental representative of our considered bipartite qubit-qutrit system that may show remarkable entanglement deaths and revivals at relatively high temperatures and high magnetic field that is comparable with the strength of the exchange interaction J between Cu+2 and Ni+2 ions, i.e., kBT ≈ J and μBB ≈ J.

Entanglement Dynamics of Strongly-AC-Driven Superconducting Qubits in Circuit QED

2011 ◽  
Vol 56 (2) ◽  
pp. 317-321 ◽  
Author(s):  
Zhen-Gang Shi ◽  
Xiong-Wen Chen ◽  
Wei Wen ◽  
Shao-Hua Xiang ◽  
Ke-Hui Song
Keyword(s):  
Superconducting Qubits ◽  
Entanglement Dynamics ◽  
Circuit Qed

Super-quantum discord with weak measurement in circuit QED

Optik ◽  
2016 ◽  
Vol 127 (18) ◽  
pp. 7180-7187
Author(s):  
Yinghua Ji ◽  
Baogen Deng ◽  
Juju Hu
Keyword(s):  
Quantum Discord ◽  
Weak Measurement ◽  
Circuit Qed ◽  
Super Quantum Discord

Geometric Quantum Discord of a Two-Qutrit System Under Decoherence at Finite Temperature

2018 ◽  
Vol 57 (5) ◽  
pp. 1471-1478
Author(s):  
You-neng Guo ◽  
Zhen-ke Liu ◽  
Qing-long Tian ◽  
Gang-lin Zhang ◽  
Guo-you Wang ◽  
...  
Keyword(s):  
Finite Temperature ◽  
Quantum Discord ◽  
Geometric Quantum Discord

scholarly journals Nonlocal correlation in Heisenberg spin models

2017 ◽  
Vol 31 (23) ◽  
pp. 1750166 ◽  
Author(s):  
R. Muthuganesan ◽  
R. Sankaranarayanan
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Thermal Equilibrium ◽  
Quantum Discord ◽  
Spin Models ◽  
Heisenberg Spin ◽  
Geometric Quantum Discord ◽  
Nonlocal Correlation

In this paper, we investigate nonlocal correlation (beyond entanglement) captured by measurement induced nonlocality and geometric quantum discord for a pair of interacting spin-1/2 particles at thermal equilibrium. It is shown that both the measures are identical in measuring the correlation. We show that nonlocal correlation between the spins exist even without entanglement and the correlation vanishes only for maximal mixture of product bases. We also observe that while interaction between the spins is responsible for enhancement of correlation, this non-classicality decreases with the intervention of external magnetic field.

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