gate.hpp

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#pragma once

#include "type.hpp"
#include "qubit_info.hpp"
#include <vector>
#include <iostream>
#include <ostream>
#include <string>

#define FLAG_PAULI 0x01
#define FLAG_CLIFFORD 0x02
#define FLAG_GAUSSIAN 0x04
#define FLAG_PARAMETRIC 0x08

class QuantumGateMatrix;
class QuantumStateBase;

class DllExport QuantumGateBase {
protected:
    std::vector<TargetQubitInfo> _target_qubit_list; 
    std::vector<ControlQubitInfo> _control_qubit_list;
    UINT _gate_property=0;                            
    std::string _name="Generic gate";

    // prohibit constructor, destructor, copy constructor, and insertion
    QuantumGateBase() {};
    QuantumGateBase(const QuantumGateBase& obj) = default;
    QuantumGateBase& operator=(const QuantumGateBase& rhs) = default;
public:
    virtual ~QuantumGateBase() {};

    const std::vector<TargetQubitInfo>& target_qubit_list = _target_qubit_list; 
    const std::vector<ControlQubitInfo>& control_qubit_list = _control_qubit_list; 
    std::vector<UINT> get_target_index_list() const {
        std::vector<UINT> res(target_qubit_list.size());
        for (UINT i = 0; i < target_qubit_list.size(); ++i) res[i] = target_qubit_list[i].index();
        return res;
    }
    std::vector<UINT> get_control_index_list() const {
        std::vector<UINT> res(control_qubit_list.size());
        for (UINT i = 0; i < control_qubit_list.size(); ++i) res[i] = control_qubit_list[i].index();
        return res;
    }

    virtual void update_quantum_state(QuantumStateBase* state)  = 0 ;
    virtual QuantumGateBase* copy() const = 0;
    virtual void set_matrix(ComplexMatrix& matrix) const = 0;

    bool is_commute(const QuantumGateBase* gate) const;
    bool is_Pauli() const;
    bool is_Clifford() const;
    bool is_Gaussian() const;
    bool is_parametric() const;
    bool is_diagonal() const;

    UINT get_property_value() const;

    bool commute_Pauli_at(UINT qubit_index, UINT pauli_type) const;

    virtual std::string to_string() const;

    friend DllExport std::ostream& operator<<(std::ostream& os, const QuantumGateBase&);
    friend DllExport std::ostream& operator<<(std::ostream& os, const QuantumGateBase* gate);
};