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Standard one-way quantum computers (1WQC) combine time symmetric unitaryevolution, with asymmetric treatment of boundaries: state preparation allows toenforce a chosen initial state, however, for the final state measurementchooses a random value instead. As e.g. pull/push, negative/positive pressure,stimulated emission/absorption causing deexcitation/excitation are CPT analogs,and one can be used for state preparation, the second should allow for its CPTanalog, referred here as CPT(state preparation) - allowing for additionalchosen enforcement of the final state, its more active treatment thanmeasurement. It should act similarly to postselection, but through appliedphysical constraints (instead of running multiple times). Like pumped to$|1\rangle$ prepared state vs its "unpumped" $\langle 0|$ CPT analog, hopefullyallowing to construct two-way quantum computers (2WQC) e.g. hydrodynamical, andhopefully photonic: seen as $\langle \Phi_{\textrm{final}}|U_{\textrm{quantumgates}}|\Phi_{\textrm{initial}}\rangle$ like for scattering matrix, withinfluenced both initial and final states. If possible, for example for aninstance of 3-SAT problem on $n$ variables, we could prepare ensemble of $2^n$inputs with Hadamard gates, calculate 3-SAT alternatives for them, and useCPT(state preparation) to enforce outcomes of all these alternatives to '1'.This way hopefully restricting this ensemble to satisfying given 3-SAT problem:$\sum_{a:\textrm{SAT}(a)} |a\rangle$, in theory allowing to attack NP problemsby simultaneously pushing and pulling information through the system for bettercontrol.

Two-way quantum computers adding CPT analog of state preparation