  Floquet symmetry protected topological (FSPT) phases are non-equilibrium
topological phases enabled by time-periodic driving. FSPT phases of 1d chains
of bosons, spins, or qubits host dynamically protected edge states that can
store quantum information without decoherence, making them promising for use as
quantum memories. While FSPT order cannot be detected by any local measurement,
here we construct non-local string order parameters that directly measure
general 1d FSPT order. We propose a superconducting-qubit array based
realization of the simplest Ising-FSPT, which can be implemented with existing
quantum computing hardware. We devise an interferometric scheme to directly
measure the non-local string order using only simple one- and two- qubit
operations and single-qubit measurements.
