Deterministic entanglement of photons in two superconducting microwave resonators

Details Deterministic entanglement of photons in two superconducting microwave resonators Deterministic entanglement of photons in two superconducting microwave resonators

2010-11-12

arxiv.org/abs/1011.2862v1

Phys. Rev. Lett. 106, 060401 (2011)

Physics

Quantum Physics

11 pages, 11 figures, and 3 tables including supplementary material

Scientific paper

10.1103/PhysRevLett.106.060401

Quantum entanglement, one of the defining features of quantum mechanics, has been demonstrated in a variety of nonlinear spin-like systems. Quantum entanglement in linear systems has proven significantly more challenging, as the intrinsic energy level degeneracy associated with linearity makes quantum control more difficult. Here we demonstrate the quantum entanglement of photon states in two independent linear microwave resonators, creating N-photon NOON states as a benchmark demonstration. We use a superconducting quantum circuit that includes Josephson qubits to control and measure the two resonators, and we completely characterize the entangled states with bipartite Wigner tomography. These results demonstrate a significant advance in the quantum control of linear resonators in superconducting circuits.

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