Macroscopic quantum information processing using spin coherent states

作者：Byrnes Tim^*; Rosseau Daniel; Khosla Megha; Pyrkov Alexey; Thomasen Andreas; Mukai Tetsuya; Koyama Shinsuke; Abdelrahman Ahmed; Ilo Okeke Ebubechukwu

来源：Optics Communications, 2015, 337: 102-109.

DOI：10.1016/j.opicom.2014.08.017

• Bose-Einstein condensates
• Quantum information
• Spin coherent states
• Quantum computing

Previously a new scheme of quantum information processing based on spin coherent states of two component Bose-Einstein condensates was proposed (Byrnes et al. Phys. Rev. A 85, 40306(R)). In this paper we give a more detailed exposition of the scheme, expanding on several aspects that were not discussed in full previously. The basic concept of the scheme is that spin coherent states are used instead of qubits to encode qubit information, and manipulated using collective spin operators. The scheme goes beyond the continuous variable regime such that the full space of the Bloch sphere is used We construct a general framework for quantum algorithms to be executed using multiple spin coherent states, which are individually controlled. We illustrate the scheme by applications to quantum information protocols, and discuss possible experimental implementations. Decoherence effects are analyzed under both general conditions and for the experimental implementation proposed.

• 出版日期2015-2-15