Editing State Tomography
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==Functionality | ==Functionality== | ||
Quantum state tomography is the process by which a quantum state is reconstructed using a series of measurements in different basis on an ensemble of identical quantum states. This technique is applied on a source of systems, to determine the quantum state of the output of that source. Hence, this technique is used to certify any process by checking the exact quantum state produced by it. The [[figure of merit]] here is the density matrix of the final quantum state. This method is extremely resource-intensive. | Quantum state tomography is the process by which a quantum state is reconstructed using a series of measurements in different basis on an ensemble of identical quantum states. This technique is applied on a source of systems, to determine the quantum state of the output of that source. Hence, this technique is used to certify any process by checking the exact quantum state produced by it. The [[figure of merit]] here is the density matrix of the final quantum state. This method is extremely resource-intensive. | ||
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* The figure of merit in this method is the density matrix of the final quantum state | * The figure of merit in this method is the density matrix of the final quantum state | ||
* All of the protocols under this technique broadly have two methods of state estimation from measurements: Linear inversion and Maximum Likelihood estimation. Linear inversion process is mathematically simpler but sometimes the computed solution of the density matrix is not valid. Hence Maximum Likelihood estimation is preferred as it constructs the states which has a higher probability of being valid. | * All of the protocols under this technique broadly have two methods of state estimation from measurements: Linear inversion and Maximum Likelihood estimation. Linear inversion process is mathematically simpler but sometimes the computed solution of the density matrix is not valid. Hence Maximum Likelihood estimation is preferred as it constructs the states which has a higher probability of being valid. | ||
==Related Papers== | ==Related Papers== | ||
* Daniel F. V. James et al PhysRevA.64.052312: Measurement of qubits | * Daniel F. V. James et al PhysRevA.64.052312: Measurement of qubits | ||
* J. B. Altepeter et al, Quantum State Tomography | * J. B. Altepeter et al, Quantum State Tomography |