Gordon Elijah E, Koo Hyun-Joo, Deng Shuiquan, Köhler Jürgen, Whangbo Myung-Hwan
Department of Chemistry, North Carolina State University, Raleigh, NC, 27695-8204, USA.
Department of Chemistry and Research Institute for Basic Sciences, Kyung Hee University, Seoul, 02447, Republic of Korea.
Chemphyschem. 2017 Aug 18;18(16):2147-2150. doi: 10.1002/cphc.201700609. Epub 2017 Jun 30.
Read/write operations with individual quantum bits (i.e., qbits) are a challenging problem to solve in quantum computing. To alleviate this difficulty, we considered the possibility of using a group of qbits that act collectively as a bit (hereafter, a group bit or a gbit, in short). A promising candidate for a gbit is a single-domain ferromagnet (SDF) independent of its size, which can be prepared as a magnet of well-separated uniaxial magnetic ions (UMIs) at sites of no electric dipole moment with their uniaxial axes aligned along one common direction. When magnetized, the UMIs of such a magnet have a ferromagnetic (FM) arrangement and the resulting SDF becomes a gbit with its two opposite moment orientations representing the |0⟩ and |1⟩ states of a bit. We probed the requirements for such magnets and identified several 2H-perovskites as materials satisfying these requirements.
对单个量子比特（即量子位）进行读/写操作是量子计算中一个具有挑战性的难题。为了缓解这一困难，我们考虑了使用一组集体充当一个比特的量子比特（以下简称“组比特”或简称为“g比特”）的可能性。一种有前途的g比特候选物是单畴铁磁体（SDF），其尺寸无关紧要，它可以被制备成一种磁体，其中单轴磁性离子（UMIs）在没有电偶极矩的位置上被很好地分隔开，且它们的单轴沿着一个共同方向排列。当被磁化时，这种磁体的UMIs具有铁磁（FM）排列，并且由此产生的SDF成为一个g比特，其两个相反的磁矩取向分别代表一个比特的|0⟩和|1⟩状态。我们探究了对此类磁体的要求，并确定了几种2H钙钛矿作为满足这些要求的材料。
