Coherence evolution and transfer supplemented by state-restoring

Abstract

The evolution of quantum coherences comes with a set of conservation laws provided that the Hamiltonian governing this evolution conserves the spin-excitation number. At that, coherences do not intertwist during the evolution. Using the transmission line and the receiver in the initial ground state we can transfer the coherences to the receiver without interaction between them, { although the matrix elements contributing to each particular coherence intertwist in the receiver's state. } Therefore we propose a tool based on the unitary transformation at the receiver side to { untwist these elements and thus} restore (at least partially) the structure of the sender's initial density matrix. A communication line with two-qubit sender and receiver is considered as an example of implementation of this technique.

18 pages

References in corpus (3)

• NMR quantum simulation of localization effects induced by decoherence
• Numerical analysis of relaxation times of multiple quantum coherences in the system with a large number of spins
• Remote creation of a one-qubit mixed state through a short homogeneous spin-1/2 chain

Cited by in corpus (7)

• Complete structural restoring of transferred multi-qubit quantum state
• Transfer of 0-order coherence matrix along spin-1/2 chain
• Partial structural restoring of two-qubit transferred state
• Optimal remote restoring of quantum states in communication lines via local magnetic field
• Computing scalar products via a two-terminal quantum transmission line
• Two-level control over quantum state creation via entangled equal-probability state
• Coherence restoring in communication line via controlled interaction with environment