Thermal entanglement and correlated coherence in two coupled double quantum dots systems

Abstract

In this work, we investigate the thermal quantum correlations in two coupled double semiconductor charge qubits. This is carried out by deriving analytical expressions for both the thermal concurrence and the correlated coherence. We study, in detail, the effects of the tunneling parameters, the Coulomb interaction and the temperature on the thermal entanglement and on the correlated coherence. It is found that the Coulomb potential plays an important role in the thermal entanglement and in the correlated coherence of the system. The results also indicate that the Coulomb potential can be used for significant enhancement of the thermal entanglement and quantum coherence. One interesting aspect is that the correlated coherence capture all the thermal entanglement at low temperatures, i.e, the local coherences are totally transferred to the thermal entanglement. Finally, we focus on the role played by thermal entanglement and the correlated coherence responsible for quantum correlations. We show that in all cases, the correlated coherence is more robust than the thermal entanglement so that quantum algorithms based only on correlated coherence may be more robust than those based on entanglement. Our results also show that the entanglement can be tuned by varying the Coulomb interaction between electrons.

arXiv comment7 pages, 8 figures

References in corpus (38)

• Entanglement of Formation of an Arbitrary State of Two Qubits
• Quantum Computation with Quantum Dots
• Introducing Quantum Discord
• Concentrating Partial Entanglement by Local Operations
• Quantum-enhanced measurements: beating the standard quantum limit
• Quantifying Coherence
• Quantum Coherence as a Resource
• Quantum Communication Through an Unmodulated Spin Chain
• Universal Quantum Computation with the Exchange Interaction
• Natural Thermal and Magnetic Entanglement in 1D Heisenberg Model
• Description of quantum coherence in thermodynamic processes requires constraints beyond free energy
• The Resource Theory of Quantum States Out of Thermal Equilibrium
• Converting Coherence to Quantum Correlations
• Charge-qubit operation of an isolated double quantum dot
• Quantum discord for general two--qubit states: Analytical progress
• Thermal and Magnetic Quantum Discord in Heisenberg models
• Coherent control of tunneling in a quantum dot molecule
• Thermal entanglement in a two-qubit Heisenberg XXZ spin chain under an inhomogeneous magnetic field
• A fast "hybrid" silicon double quantum dot qubit
• A Unified View of Quantum Correlations and Quantum Coherence
• The role of quantum coherence in non-equilibrium entropy production
• Entanglement and coherence in quantum state merging
• Input-output theory for spin-photon coupling in Si double quantum dots
• Stable macroscopic quantum superpositions
• Entanglement versus Quantum Discord in Two Coupled Double Quantum Dots
• Dephasing due to background charge fluctuations
• Tunable phonon induced steady state coherence in a double quantum dot
• Scalable qubit architecture based on holes in quantum dot molecules
• Teleportation in the presence of common bath decoherence at the transmitting station
• Optimal dispersive readout of a spin qubit with a microwave resonator
• Entanglement as the symmetric portion of correlated coherence
• Teleportation on a quantum dot array
• Bell states and entanglement dynamics on two coupled quantum molecules
• Genuine Distributed Coherence
• Paired electron motion in interacting chains of quantum dots
• High-Fidelity Entangling Gates for Quantum-Dot Hybrid Qubits Based on Exchange Interactions
• Quantum entanglement driven by electron-vibrational mode coupling
• Spin-orbit-coupled quantum memory of a double quantum dot

Cited by in corpus (10)

• Two Coupled Double Quantum Dots Systems as an working substance for Heat Machines
• Intrinsic decoherence effects on correlated coherence and quantum discord in XXZ Heisenberg model
• Effect of induced transition on the quantum entanglement and coherence in two-coupled double quantum dots system
• Thermal entanglement and quantum coherence of a single electron in a double quantum dot with Rashba Interaction
• Thermal quantum correlations in two gravitational cat states
• Tsallis relative $\alpha$ entropy of coherence dynamics in Grover's search algorithm
• Geometric quantum discord and coherence in a dipolar interacting magnetic system
• Pairwise quantum correlations in four-level quantum dot systems
• Synchronized coherent charge oscillations in coupled double quantum dots
• Magnetoelastic control of quantum correlations and field sensitivity in a spin-1/2 Heisenberg dimer