Quantum state transfer and time-dependent disorder in Quantum Chains

Abstract

One of the most basic tasks required for Quantum Information Technology is the ability to connect different components of a Quantum Computer by quantum wires that obey the superposition principle. Since superpositions can be very sensitive to noise this turns out to be already quite difficult. Recently, it was suggested to use chains of permanently coupled spin-1/2 particles (quantum chains) for this purpose. They have the advantage that no external control along the wire is required during the transport of information, which makes it possible to isolate the wire from sources of noise. We first give an introduction to basic quantum state transfer and review existing advanced schemes by other authors. We then show a new result that demonstrates the stability of the scheme [1] against disorder that is approximately constant during one application of the channel, but time-dependent with respect to multiple applications.

9 pages, 6 figures, submitted to the proceedings of the 382. WEH workshop "transrel" March 2007; added reference to experimental realization

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Cited by in corpus (5)

• Perfect state transfer on a spin-chain without state initialization
• Directional Coupling for Quantum Computing and Communication
• Control-limited perfect state transfer, quantum stochastic resonance and many-body entangling gate in imperfect qubit registers
• Entanglement purification without controlled-NOT gates by using the natural dynamics of spin chains
• Quantum Data Bus in Dipolar Coupled Nuclear Spin Qubits