cqlib-core 0.1.0-beta.5

The high-performance core foundation for the CQLib quantum computing ecosystem.
Documentation 
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// This code is part of Cqlib.
//
// (C) Copyright China Telecom Quantum Group 2026
//
// This code is licensed under the Apache License, Version 2.0. You may
// obtain a copy of this license in the LICENSE.txt file in the root directory
// of this source tree or at http://www.apache.org/licenses/LICENSE-2.0.
//
// Any modifications or derivative works of this code must retain this
// copyright notice, and modified files need to carry a notice indicating
// that they have been altered from the originals.

// Phase-family decomposition rules.
//
// These rules own exact phase lowering for Phase/GPhase-adjacent fixed gates.

rule decompose_phase_to_rz {
    match { Phase(theta) 0 }
    rewrite { RZ(theta) 0, GPhase(theta/2) }
}

// Keep phase-specialized U gates lowerable to a U-native target basis.
rule decompose_phase_to_u {
    match { Phase(theta) 0 }
    rewrite { U(0, 0, theta) 0 }
}

rule decompose_phase_to_rx_ry {
    match { Phase(theta) 0 }
    rewrite { RX(-π/2) 0, RY(theta) 0, RX(π/2) 0, GPhase(theta/2) }
}

rule decompose_rz_to_phase {
    match { RZ(theta) 0 }
    rewrite { Phase(theta) 0, GPhase(-theta/2) }
}

rule decompose_s_to_phase {
    match { S 0 }
    rewrite { Phase(π/2) 0 }
}

rule decompose_s_to_t {
    match { S 0 }
    rewrite { T 0, T 0 }
}

rule decompose_s_to_rz {
    match { S 0 }
    rewrite { RZ(π/2) 0, GPhase(π/4) }
}

rule decompose_sdg_to_phase {
    match { SDG 0 }
    rewrite { Phase(-π/2) 0 }
}

rule decompose_sdg_to_tdg {
    match { SDG 0 }
    rewrite { TDG 0, TDG 0 }
}

rule decompose_sdg_to_rz {
    match { SDG 0 }
    rewrite { RZ(-π/2) 0, GPhase(-π/4) }
}

rule decompose_t_to_phase {
    match { T 0 }
    rewrite { Phase(π/4) 0 }
}

rule decompose_t_to_rz {
    match { T 0 }
    rewrite { RZ(π/4) 0, GPhase(π/8) }
}

rule decompose_tdg_to_phase {
    match { TDG 0 }
    rewrite { Phase(-π/4) 0 }
}

rule decompose_tdg_to_rz {
    match { TDG 0 }
    rewrite { RZ(-π/4) 0, GPhase(-π/8) }
}

rule decompose_z_to_phase {
    match { Z 0 }
    rewrite { Phase(π) 0 }
}

rule decompose_z_to_rz {
    match { Z 0 }
    rewrite { RZ(π) 0, GPhase(π/2) }
}