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We report a high-pressure transport study of the upper-critical field,$B_{c2}(T)$, of the topological superconductor Sr$_{0.15}$Bi$_2$Se$_3$ ($T_c =3.0$ K). $B_{c2}(T)$ was measured for magnetic fields directed along twoorthogonal directions, $a$ and $a^*$, in the trigonal basal plane. Whilesuperconductivity is rapidly suppressed at the critical pressure $p_c \sim 3.5$GPa, the pronounced two-fold basal-plane anisotropy $B_{c2}^a/B_{c2}^{a^*} =3.2$ at $T=0.3$ K, recently reported at ambient pressure (Pan et al., 2016), isreinforced and attains a value of $\sim 5$ at the highest pressure (2.2 GPa).The data reveal that the unconventional superconducting state with brokenrotational symmetry is robust under pressure.

High-pressure study of the basal-plane anisotropy of the upper critical field of the topological superconductor SrxBi2Se3