Non-coherent space-time code based on full diversity space-time block coding

A non-unitary non-coherent space-time code which is capable of achieving full algebraic diversity is proposed based on full diversity space-time block coding, The error performance is optimized by transforming the non-unitary space-time code into unitary space-time code, By exploiting the desired structure of the proposed code, a grouped generalized likelihood ratio test decoding algorithm is presented to overcome the high complexity of the optimal algorithm, Simulation results show that the proposed code possesses high spectrum efficiency in contrast to the unitary space-time code despite slight loss in the SNR, and besides, the proposed grouped decoding algorithm provides good tradeoff between performance and complexity,

Precision measurements and tau neutrino physics in a future accelerator neutrino experiment

We investigate prospects of building a future accelerator-based neutrino oscillation experiment in China,including site selection,beam optimization and tau neutrino physics aspects.CP violation,non-unitary mixing and non-standard neutrino interactions are discussed.We simulate neutrino beam setups based on muon and beta decay techniques and compare Chinese laboratory sites by their expected sensitivities.A case study on the Super Proton-Proton Collider and the China JinPing Laboratory is also presented.It is shown that the muon-decay-based beam setup can measure the Dirac CP phase by about 14.2°precision at 1σCL,whereas non-unitarity can be probed down to |α_(ij)|≲0.37(i≠j=1,2,3)and non-standard interactions to|ϵ_(ℓℓ′)^(m)|≲0.11(ℓ≠ℓ′=e,μ,τ)at 90% CL,respectively.

Pairing symmetry in monolayer of orthorhombic CoSb

Ferromagnetism and superconductivity are generally considered to be antagonistic phenomena in condensed matter physics.Here,we theoretically study the interplay between the ferromagnetic and superconducting orders in a recent discovered monolayered CoSb superconductor with an orthorhombic symmetry and net magnetization,and demonstrate the pairing symmetry of CoSb as a candidate of non-unitary superconductor with time-reversal symmetry breaking.By performing the group theory analysis and the first-principles calculations,the superconducting order parameter is suggested to be a triplet pairing with the irreducible representation of 3B2u,which displays intriguing nodal points and non-zero periodic modulation of Cooper pair spin polarization on the Fermi surface topologies.These findings not only provide a significant theoretical insight into the coexistence of superconductivity and ferromagnetism,but also reveal the exotic spin polarized Cooper pairing driven by ferromagnetic spin fluctuations in a triplet superconductor.