Channel Capacities of an Exactly Solvable Spin-Star System

Abstract

We calculate the entanglement-assisted and unassisted channel capacities of an exactly solvable spin star system, which models the quantum dephasing channel. The capacities for this non-Markovian model exhibit a strong dependence on the coupling strengths of the bath spins with the system, the bath temperature, and the number of bath spins. For equal couplings and bath frequencies, the channel becomes periodically noiseless.

8 pages, 5 figures

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Cited by in corpus (17)

• Quantum channels and memory effects
• Classical and quantum capacities of a fully correlated amplitude damping channel
• Genuine Tripartite Entanglement in a Spin-Star Network at Thermal Equilibrium
• Witnessing quantum capacities of correlated channels
• Information transmission over an amplitude damping channel with an arbitrary degree of memory
• Non-Markovian dynamics under time-translation symmetry
• Quantum simulation of the central spin model with a Rydberg atom and polar molecules in optical tweezers
• Exact dynamics of the homogeneous two-qubit $XXZ$ central spin model with the spin bath prepared in superpositions of symmetric Dicke states
• Dynamical pairwise entanglement and two-point correlations in the three-ligand spin-star structure
• Coherent Averaging
• Classical correlation and quantum entanglement in the mixed-spin Ising-XY model with Dzyaloshinskii-Moriya interaction
• Exact reduced dynamics for a qubit in a precessing magnetic field and in the contact with a heat-bath
• Dynamics of a driven spin coupled to an antiferromagnetic spin bath
• Experimental witnessing of the quantum channel capacity in the presence of correlated noise
• Stationary states of two-level open quantum systems
• Kraus representation for maps and master equation in spin star model with layered environment
• Quantum refrigerator embedded in spin-star environments: Scalings of temperature and refrigeration time