6533b7d2fe1ef96bd125ecf3
RESEARCH PRODUCT
Optimal estimation of losses at the ultimate quantum limit with non-Gaussian states
Fabrizio IlluminatiFabrizio IlluminatiGerardo AdessoGerardo AdessoF. Dell'annoS. De SienaLeonardo A. M. SouzaLeonardo A. M. Souzasubject
High Energy Physics - TheoryPhotonPHOTON NUMBER STATES DETERMINISTIC GENERATION CIRCUIT CAVITY FIELDGaussianFOS: Physical sciencesValue (computer science)Fock spacePHOTON NUMBER STATESsymbols.namesakeQuantum mechanicsFIELDQuantum information scienceMathematical PhysicsPhysicsDETERMINISTIC GENERATIONQuantum PhysicsOptimal estimationPHOTON NUMBER STATES; DETERMINISTIC GENERATION; CIRCUIT; CAVITY; FIELDQuantum limitCIRCUITMathematical Physics (math-ph)Atomic and Molecular Physics and OpticsCondensed Matter - Other Condensed MatterHigh Energy Physics - Theory (hep-th)CAVITYsymbolsQuantum Physics (quant-ph)Other Condensed Matter (cond-mat.other)Optics (physics.optics)Communication channelPhysics - Opticsdescription
We address the estimation of the loss parameter of a bosonic channel probed by arbitrary signals. Unlike the optimal Gaussian probes, which can attain the ultimate bound on precision asymptotically either for very small or very large losses, we prove that Fock states at any fixed photon number saturate the bound unconditionally for any value of the loss. In the relevant regime of low-energy probes, we demonstrate that superpositions of the first low-lying Fock states yield an absolute improvement over any Gaussian probe. Such few-photon states can be recast quite generally as truncations of de-Gaussified photon-subtracted states.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2009-01-01 |