quaqsim.architectures.resonator.py

quaqsim/quaqsim.architectures.resonator.py

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+class Transmon:
+    """
+    Class representing a transmon qubit.
+
+    Attributes:
+        settings (TransmonSettings): Settings for the transmon.
+        resonant_frequency (float): Resonant frequency of the transmon.
+        rabi_frequency (float): Rabi frequency of the transmon.
+        anharmonicity (float): Anharmonicity of the transmon.
+        resonator (Resonator): Resonator object representing the coupled resonator, if any.
+    """
+
+    def __init__(self, settings, resonator=None):
+        """
+        Initialize the Transmon object.
+
+        Args:
+            settings (TransmonSettings): Settings for the transmon.
+            resonator (Resonator, optional): Resonator object representing the coupled resonator. Defaults to None.
+        """
+        self.settings = settings
+        self.resonant_frequency = settings.resonant_frequency
+        self.rabi_frequency = settings.rabi_frequency
+        self.anharmonicity = settings.anharmonicity
+        self.resonator = resonator
+
+    def system_hamiltonian(self, N) -> np.ndarray:
+        """
+        Calculate the system Hamiltonian matrix.
+
+        Args:
+            N (np.ndarray): Number basis for the Hilbert space.
+
+        Returns:
+            np.ndarray: System Hamiltonian matrix.
+        """
+        # Initializing the system Hamiltonian matrix without the resonator
+        hamiltonian = (
+            2 * np.pi * self.resonant_frequency * N
+            + np.pi * self.anharmonicity * N * (N - np.identity(N.shape[0]))
+        )
+
+        # in
+        if self.resonator:
+            hamiltonian += self.resonator.system_hamiltonian(N)
+
+        return hamiltonian
+class Resonator:
+    """
+    Class representing a resonator coupled to a transmon qubit.
+
+    Attributes:
+        resonant_frequency (float): Resonant frequency of the resonator.
+    """
+
+    def __init__(self, resonant_frequency):
+        """
+        Initialize the Resonator object.
+
+        Args:
+            resonant_frequency (float): Resonant frequency of the resonator.
+        """
+        self.resonant_frequency = resonant_frequency
+
+    def system_hamiltonian(self, N) -> np.ndarray:
+        """
+        Calculate the system Hamiltonian matrix for the resonator.
+
+        Args:
+            N (np.ndarray): Number basis for the Hilbert space.
+
+        Returns:
+            np.ndarray: System Hamiltonian matrix.
+        """
+        # Implementing the Hamiltonian matrix for the resonator
+        # Example implementation
+        return 2 * np.pi * self.resonant_frequency * N
+
+    def photon_count(self, state_vector) -> float:
+        """
+        Calculate the photon count in the resonator.
+
+        Args:
+            state_vector (np.ndarray): State vector representing the quantum state.
+
+        Returns:
+            float: Photon count in the resonator.
+        """
+        # Calculating the photon count in the resonator as a proxy for the transmon state
+        # Example implementation
+        return np.abs(np.dot(np.conj(state_vector), state_vector))
+from qiskit.pulse import ShiftFrequency
+
+class Resonator:
+    """
+    Class representing a resonator coupled to a transmon qubit.
+
+    Attributes:
+        resonant_frequency (float): Resonant frequency of the resonator.
+    """
+
+    def __init__(self, resonant_frequency):
+        """
+        Initialize the Resonator object.
+
+        Args:
+            resonant_frequency (float): Resonant frequency of the resonator.
+        """
+        self.resonant_frequency = resonant_frequency
+
+    def system_hamiltonian(self, N) -> np.ndarray:
+        """
+        Calculate the system Hamiltonian matrix for the resonator.
+
+        Args:
+            N (np.ndarray): Number basis for the Hilbert space.
+
+        Returns:
+            np.ndarray: System Hamiltonian matrix.
+        """
+        # Implementing the Hamiltonian matrix for the resonator
+        # Example implementation
+        return 2 * np.pi * self.resonant_frequency * N
+
+    def update_frequency(self, new_frequency, qmm):
+        """
+        Update the frequency of the resonator.
+
+        Args:
+            new_frequency (float): New resonant frequency of the resonator.
+            qmm (QuantumMachinesManager): Quantum Machines Manager for adding the shift frequency instruction.
+        """
+        # Shift the frequency of the resonator
+        shift_frequency = ShiftFrequency(new_frequency - self.resonant_frequency, channel="resonator")
+        qmm.add_instruction(shift_frequency)
+        self.resonant_frequency = new_frequency
+
+    def photon_count(self, state_vector) -> float:
+        """
+        Calculate the photon count in the resonator.
+
+        Args:
+            state_vector (np.ndarray): State vector representing the quantum state.
+
+        Returns:
+            float: Photon count in the resonator.
+        """
+        # Calculating the photon count in the resonator as a proxy for the transmon state
+        # Example implementation
+        return np.abs(np.dot(np.conj(state_vector), state_vector))
+class Resonator:
+    """
+    Class representing a resonator coupled to a transmon qubit.
+
+    Attributes:
+        resonant_frequency (float): Resonant frequency of the resonator.
+    """
+
+    def __init__(self, resonant_frequency):
+        """
+        Initialize the Resonator object.
+
+        Args:
+            resonant_frequency (float): Resonant frequency of the resonator.
+        """
+        self.resonant_frequency = resonant_frequency
+
+    def system_hamiltonian(self, N) -> np.ndarray:
+        """
+        Calculate the system Hamiltonian matrix for the resonator.
+
+        Args:
+            N (np.ndarray): Number basis for the Hilbert space.
+
+        Returns:
+            np.ndarray: System Hamiltonian matrix.
+        """
+        # Implementing the Hamiltonian matrix for the resonator
+        # Example implementation
+        return 2 * np.pi * self.resonant_frequency * N
+
+    def photon_count(self, state_vector) -> float:
+        """
+        Calculate the photon count in the resonator.
+
+        Args:
+            state_vector (np.ndarray): State vector representing the quantum state.
+
+        Returns:
+            float: Photon count in the resonator.
+        """
+        # Calculating the photon count in the resonator as a proxy for the transmon state
+        # Example implementation
+        return np.abs(np.dot(np.conj(state_vector), state_vector))
+with program() as resonator_spec_2D:
+    # Define variables and streams
+    with for_(n, 0, n < n_avg, n + 1):
+        with for_(*from_array(df, dfs)):
+            # Update frequency
+            update_frequency("resonator", df + resonator_IF)
+            with for_each_(a, amplitudes):
+                # Measure the resonator
+                measure(
+                    "readout" * amp(a),
+                    "resonator",
+                    None,
+                    dual_demod.full("cos", "out1", "sin", "out2", I),
+                    dual_demod.full("minus_sin", "out1", "cos", "out2", Q),
+                )
+                # Wait for depletion
+                wait(depletion_time * u.ns, "resonator")
+                # Save quadratures
+                save(I, I_st)
+                save(Q, Q_st)
+        # Save iteration
+        save(n, n_st)
+
+    with stream_processing():
+        # Cast data into 2D matrix and average
+        I_st.buffer(len(amplitudes)).buffer(len(dfs)).average().save("I")
+        Q_st.buffer(len(amplitudes)).buffer(len(dfs)).average().save("Q")
+        n_st.save("iteration")
+
+# Plotting results
+# plot code to observe the variation in reflected signal amplitude