Quantum state tomography of polarization states - an exploration of quantum logic gates

Christian David Torres, Carlos A. Melo-Luna, John Henry Reina

We implemented one-qubit quantum gates testing through the production of the polarization set of states, with |H〉 as input. Complementary, we reconstructed the state for each output via the quantum-tomography protocol with fidelities over 95%.

Oliver Dial

Xiang Cheng, Zhenda Xie, Kai-Chi Chang +11 more

We experimentally demonstrate a chip-scale polarization to spatial-momentum qubit SWAP gate. High fidelity of the SWAP gate operation is confirmed by quantum state tomography, with average gate fidelity up to 97.30%.

Akira Ocirc IDE

Allen Stairs

Jonathan Home, M J McDonnell, D M Lucas +7 more

We have implemented a universal quantum logic gate between qubits stored in the spin state of a pair of trapped 40 Ca ions. An initial product state was driven to a maximally entangled state deterministically, with 83% fidelity. We present a general approach to quantum state tomography which achieves good robustness to experimental noise and drift, and use it to measure the spin state of the ions. We find the entanglement of formation is 0.54.