##### Department of Mathematics,

University of California San Diego

****************************

### Math 278C: Optimization and Data Science

## Dr. Yee Ern Tan

#### Auburn University (yzt0060@auburn.edu)

## Tensor decompositions with applications to LU and SLOCC equivalence of multipartite pure states

##### Abstract:

We introduce a broad lemma, one consequence of which is the higher order singular value decomposition (HOSVD) of tensors defined by DeLathauwer, DeMoor and Vandewalle (2000). By an analogous application of the lemma, we find a complex orthogonal version of the HOSVD. Kraus's (2010) algorithm used the HOSVD to compute normal forms of almost all n-qubit pure states under the action of the local unitary group. Taking advantage of the double cover SL2(C)×SL2(C)→SO4(C), we produce similar algorithms (distinguished by the parity of n) that compute normal forms for almost all n-qubit pure states under the action of the SLOCC group.

Jiawang Nie

### November 20, 2024

### 4:00 PM

APM 6402

****************************