Quantum computing with an electron spin ensemble

Abstract

We propose to encode a register of quantum bits in different collective electron spin wave excitations in a solid medium. Coupling to spins is enabled by locating them in the vicinity of a superconducting transmission line cavity, and making use of their strong collective coupling to the quantized radiation field. The transformation between different spin waves is achieved by applying gradient magnetic fields across the sample, while a Cooper Pair Box, resonant with the cavity field, may be used to carry out one- and two-qubit gate operations.

Several small corrections and modifications. This version is identical to the version published in Phys. Rev. Lett

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• Probing dynamics of an electron-spin ensemble via a superconducting resonator
• Spectroscopic properties of inhomogeneously broadened spin ensembles in a cavity
• Hybrid solid state qubits: the powerful role of electron spins
• Zeno and anti-Zeno polarization control of spin-ensembles by induced dephasing
• Dispersive read-out of ferromagnetic resonance for strongly coupled magnons and microwave photons
• Bandwidth-Limited Control and Ringdown Suppression in High-Q Resonators
• Nonequilibrium phases in hybrid arrays with flux qubits and NV centers
• Generation of macroscopic quantum-superposition states by linear coupling to a bath
• Improving the lifetime of the NV center ensemble coupled with a superconducting flux qubit by applying magnetic fields
• Hybrid Quantum Systems with Collectively Coupled Spin States: Suppression of Decoherence through Spectral Hole Burning
• Dynamics of the collective modes of an inhomogeneous spin ensemble in a cavity
• Coupling of a locally implanted rare-earth ion ensemble to a superconducting micro-resonator
• Controlled generation of field squeezing with cold atomic clouds coupled to a superconducting transmission line resonator
• Scalable quantum information transfer between nitrogen-vacancy-center ensembles