cqlib-core 0.1.0-beta.4

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.

// SWAP decomposition rules.
//
// These rules provide multiple target paths for two-qubit exchange.

rule decompose_swap_to_cx {
    match { SWAP 0 1 }
    rewrite { CX 0 1, CX 1 0, CX 0 1 }
}

rule decompose_swap_to_cz {
    match { SWAP 0 1 }
    rewrite { H 1, CZ 0 1, H 0, H 1, CZ 0 1, H 0, H 1, CZ 0 1, H 1 }
}

rule decompose_swap_to_cy {
    match { SWAP 0 1 }
    rewrite { S 1, CY 0 1, SDG 1, S 0, CY 1 0, SDG 0, S 1, CY 0 1, SDG 1 }
}

rule decompose_swap_to_ising {
    match { SWAP 0 1 }
    rewrite { RXX(π/2) 0 1, RYY(π/2) 0 1, RZZ(π/2) 0 1, GPhase(π/4) }
}

rule decompose_swap_to_rx_ry_rzz {
    match { SWAP 0 1 }
    rewrite { RY(-π/2) 0, RY(-π/2) 1, RZZ(π/2) 0 1, RY(π/2) 1, RY(π/2) 0, RX(π/2) 0, RX(π/2) 1, RZZ(π/2) 0 1, RX(-π/2) 1, RX(-π/2) 0, RZZ(π/2) 0 1, GPhase(π/4) }
}

rule decompose_swap_to_x2p_cz {
    match { SWAP 0 1 }
    rewrite {
        X2P 0, X2P 1, CZ 0 1,
        X2P 0, X2P 1, CZ 0 1,
        X2P 0, X2P 1, CZ 0 1,
        GPhase(π)
    }
}

rule decompose_swap_to_x2m_cz {
    match { SWAP 0 1 }
    rewrite {
        X2M 0, X2M 1, CZ 0 1,
        X2M 0, X2M 1, CZ 0 1,
        X2M 0, X2M 1, CZ 0 1,
        GPhase(π)
    }
}

rule decompose_swap_to_y2m_cz {
    match { SWAP 0 1 }
    rewrite {
        Y2M 0, Y2M 1, CZ 0 1,
        Y2M 0, Y2M 1, CZ 0 1,
        Y2M 0, Y2M 1, CZ 0 1,
        GPhase(π)
    }
}

rule decompose_swap_to_x2p_cx {
    match { SWAP 0 1 }
    rewrite {
        X2P 0, X2P 1, CX 0 1,
        X2P 0, X2P 1, CX 1 0,
        X2P 0, X2P 1, CX 0 1,
        GPhase(-π/2)
    }
}

rule decompose_swap_to_y2m_cx {
    match { SWAP 0 1 }
    rewrite {
        Y2M 0, Y2M 0, CX 0 1,
        Y2M 0, Y2M 1, CX 0 1,
        Y2M 0, Y2M 1, CX 0 1,
        GPhase(π)
    }
}

rule decompose_swap_to_y2p_cz {
    match { SWAP 0 1 }
    rewrite {
        Y2P 0, Y2P 1, CZ 0 1,
        Y2P 0, Y2P 1, CZ 0 1,
        Y2P 0, Y2P 1, CZ 0 1,
        GPhase(π)
    }
}

rule decompose_swap_to_x2p_x2m_cz {
    match { SWAP 0 1 }
    rewrite {
        X2P 0, X2M 1, CZ 0 1,
        X2M 0, X2P 1, CZ 0 1,
        X2P 0, X2M 1, CZ 0 1
    }
}

rule decompose_swap_to_y2p_y2m_cz {
    match { SWAP 0 1 }
    rewrite {
        Y2P 0, Y2M 1, CZ 0 1,
        Y2M 0, Y2P 1, CZ 0 1,
        Y2P 0, Y2M 1, CZ 0 1
    }
}

rule decompose_swap_to_x2p_y2p_cz {
    match { SWAP 0 1 }
    rewrite {
        X2P 0, Y2P 1, CZ 0 1,
        X2P 0, Y2P 1, CZ 0 1,
        X2P 0, Y2P 1, CZ 0 1,
        RZ(π/2) 0, RZ(-π/2) 1,
        GPhase(π)
    }
}

rule decompose_swap_to_x2p_y2m_cz {
    match { SWAP 0 1 }
    rewrite {
        X2P 0, Y2M 1, CZ 0 1,
        X2P 0, Y2M 1, CZ 0 1,
        X2P 0, Y2M 1, CZ 0 1,
        RZ(3*π/2) 0, RZ(π/2) 1
    }
}