Using continuous measurement to protect a universal set of quantum gates within a perturbed decoherence-free subspace

Abstract

We consider a universal set of quantum gates encoded within a perturbed decoherence-free subspace of four physical qubits. Using second-order perturbation theory and a measuring device modeled by an infinite set of harmonic oscillators, simply coupled to the system, we show that continuous observation of the coupling agent induces inhibition of the decoherence due to spurious perturbations. We thus advance the idea of protecting or even creating a decoherence-free subspace for processing quantum information.

7 pages, 1 figure. To be published in Journal of Physics A: Mathematical and General

References in corpus (1)

• A Magnetic Resonance Realization of Decoherence-Free Quantum Computation

Cited by in corpus (7)

• Entanglement versus Quantum Discord in Two Coupled Double Quantum Dots
• Continuously decoupling single-qubit operations from a perturbing thermal bath of scalar bosons
• $\kappa$-Minkowski Spacetime Through Exotic "Oscillator"
• Protection of entanglement from sudden death using continuous dynamical decoupling
• Extended Cahill and Glauber formalism for finite dimensional spaces II. Applications in quantum tomography and quantum teleportation
• Continuously decoupling a Hadamard quantum gate from independent classes of errors
• Shielding quantum discord through continuous dynamical decoupling