Erlangen 2018 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 2: Quantum Optics I

Q 2.3: Talk

Monday, March 5, 2018, 11:15–11:30, K 0.016

Generation of Multimode Photonic States for Quantum Metrology — •Vanessa Paulisch, Martí Perarnau Llobet, Alejandro González-Tudela, and J. Ignacio Cirac — Max-Planck-Institute of Quantum Optics, Garching, Germany

The high fidelity generation of photonic states is crucial for quantum communication and quantum metrology with photons. We study the conditions under which a chain of emitters coupled to a one dimensional waveguide emits a photonic state. We have shown that arbitrary photonic states of a single mode (Fock states or superpositions thereof) can be generated when the number of emitters is much larger than the number of excitations in the emitters, i.e., the number of photons to be generated. On the other hand, when the emitters are fully excited, they emit a intricate multimode photonic state. It was unclear whether these states are as useful as the more standard single mode states. We show that, indeed, also these multimode photonic states are useful for quantum metrology on the example of a phase measurement. And quite remarkably, they still easily beat the standard quantum limit of phase estimation.