Quantum information processing via a lossy bus

Abstract

We describe a method to perform two qubit measurements and logic operations on pairs of qubits which each interact with a harmonic oscillator degree of freedom (the \emph{bus}), but do not directly interact with one another. Our scheme uses only weak interactions between the qubit and the bus, homodyne measurements, and single qubit operations. In contrast to earlier schemes, the technique presented here is extremely robust to photon loss in the bus mode, and can function with high fidelity even when the rate of photon loss is comparable to the strength of the qubit-bus coupling.

Added more discussion on effects of noise. Typos corrected

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Cited by in corpus (9)

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• Effects of self-phase modulation on weak nonlinear optical quantum gates
• Photonic two-qubit parity gate with tiny cross-Kerr nonlinearity
• Schemes for quantum entanglement concentration of two unknown partially entangled states with cross-Kerr nonlinearity
• Loss in hybrid qubit-bus couplings and gates
• Highly Efficient Processing Multi-photon States
• Efficient hybrid entanglement concentration for quantum communications
• Quantum computation mediated by ancillary qudits and spin coherent states
• Octonionic Strong and Weak Interactions and Their Quantum Equations