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Do a State Tomographytomography in Qiskit on a Subsystemsubset of a Real Devicequbits of real QPU

Could anyone please explain how doshould I docarry out a state tomography on a real device in Qiskit (version 0.43.2)? I can just have access to devices with 127 qubits, but I want to perform a simulation using only four qubits, and then do a state tomography on them. When I use StateTomographyStateTomography specifying the circuit, the backend and the measurement_indicesmeasurement_indices, it just tries to evaluteevaluate the density matrix of the whole device (returning an error, since it would be $2^{127}\times2^{127}$). Is there any way to isolate just the four qubit I am working with? Thank you for your time

Do a State Tomography in Qiskit on a Subsystem of a Real Device

Could anyone please explain how do I do a state tomography on a real device in Qiskit (version 0.43.2)? I can just have access to devices with 127 qubits, but I want to perform a simulation using only four qubits, and then do a state tomography on them. When I use StateTomography specifying the circuit, the backend and the measurement_indices, it just tries to evalute the density matrix of the whole device (returning an error, since it would be $2^{127}\times2^{127}$). Is there any way to isolate just the four qubit I am working with? Thank you for your time

State tomography in Qiskit on a subset of qubits of real QPU

Could anyone please explain how should I carry out a state tomography on a real device in Qiskit (version 0.43.2)? I have access to devices with 127 qubits, but I want to perform a simulation using only four qubits and then do a state tomography on them. When I use StateTomography specifying the circuit, the backend and the measurement_indices, it just tries to evaluate the density matrix of the whole device (returning an error, since it would be $2^{127}\times2^{127}$). Is there any way to isolate just the four qubit I am working with?