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Nonlinear Optics Quantum Computing with Circuit QED



Prabin Adhikari, Mohammad Hafezi, Jacob Taylor


One approach to quantum information processing is to use photons as quantum bits and rely on linear optical elements for most operations. However, some optical nonlinearity is necessary to enable universal quantum computing. Here, we suggest a circuit-QED approach to linear optics quantum computing in the microwave regime, including a deterministic two-photon phase gate. Our specific example uses a hybrid quantum system comprising a LC resonator coupled to a phase superconducting quantum bit to implement a high fidelity nonlinear phase shift. Using this model, we show how fast two-qubit gates between photons are possible, and compute limitations of these ideas based on current technology.
Physical Review Letters


Nonlinear Optics, Superconducting Qubits, Two-Photon Phase Gate


Adhikari, P. , Hafezi, M. and Taylor, J. (2013), Nonlinear Optics Quantum Computing with Circuit QED, Physical Review Letters, [online],, (Accessed May 24, 2024)


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Created February 4, 2013, Updated October 12, 2021