Measurement-Induced Strong Kerr Nonlinearity for Weak Quantum States of Light.
Phys Rev Lett
; 119(1): 013601, 2017 Jul 07.
Article
en En
| MEDLINE
| ID: mdl-28731763
ABSTRACT
Strong nonlinearity at the single photon level represents a crucial enabling tool for optical quantum technologies. Here we report on experimental implementation of a strong Kerr nonlinearity by measurement-induced quantum operations on weak quantum states of light. Our scheme coherently combines two sequences of single photon addition and subtraction to induce a nonlinear phase shift at the single photon level. We probe the induced nonlinearity with weak coherent states and characterize the output non-Gaussian states with quantum state tomography. The strong nonlinearity is clearly witnessed as a change of sign of specific off-diagonal density matrix elements in the Fock basis.
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01-internacional
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MEDLINE
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En
Revista:
Phys Rev Lett
Año:
2017
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Article
País de afiliación:
Italia