Perfect State Transfer in Quantum Spin Networks
Matthias Christandl,Nilanjana Datta,Artur Ekert,Artur Ekert,Andrew J. Landahl,Andrew J. Landahl +5 more
TLDR
It is shown that 2log3N is the maximal perfect communication distance for hypercube geometries if one allows fixed but different couplings between the qubits, then perfect state transfer can be achieved over arbitrarily long distances in a linear chain.Abstract:
We propose a class of qubit networks that admit the perfect state transfer of any quantum state in a fixed period of time. Unlike many other schemes for quantum computation and communication, these networks do not require qubit couplings to be switched on and off. When restricted to N-qubit spin networks of identical qubit couplings, we show that 2log3N is the maximal perfect communication distance for hypercube geometries. Moreover, if one allows fixed but different couplings between the qubits, then perfect state transfer can be achieved over arbitrarily long distances in a linear chain.read more
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Entanglement in many-body systems
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Environment-assisted quantum walks in photosynthetic energy transfer.
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Perfect Transfer of Arbitrary States in Quantum Spin Networks
Matthias Christandl,Nilanjana Datta,Tony Dorlas,Artur Ekert,Artur Ekert,Alastair Kay,Andrew J. Landahl,Andrew J. Landahl +7 more
TL;DR: Christandl et al. as discussed by the authors proposed a class of qubit networks that admit perfect state transfer of any two-dimensional quantum state in a fixed period of time, and they further showed that such networks can distribute arbitrary entangled states between two distant parties, and can, by using such systems in parallel, transmit the higher-dimensional systems states across the network.
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Quantum entanglement in condensed matter systems
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Quantum communication through spin chain dynamics: an introductory overview
TL;DR: A spin chain is a permanently coupled 1D system of spins as discussed by the authors, which can be used to connect quantum registers without resorting to optics, and it has been shown that it is possible to achieve perfect quantum state transfer through spin chains.