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Violation of local uncertainty relations as a signature of entanglement

- H. Hofmann, S. Takeuchi
- Physics
- 16 December 2002

Entangled states represent correlations between two separate systems that are too precise to be represented by products of local quantum states. We show that this limit of precision for the local… Expand

Directional control of light by a nano-optical Yagi–Uda antenna

- T. Kosako, H. Hofmann, Y. Kadoya
- Physics
- 13 October 2009

A Yagi–Uda directional antenna — the work horse of radiofrequency communications for more than 60 years — has now been demonstrated at visible wavelengths. An array of appropriately tuned… Expand

High-photon-number path entanglement in the interference of spontaneously down-converted photon pairs with coherent laser light

- H. Hofmann, T. Ono
- Physics
- 1 May 2007

We show that the quantum interference between down-converted photon pairs and photons from coherent laser light can produce a maximally path entangled N-photon output component with a fidelity… Expand

All path-symmetric pure states achieve their maximal phase sensitivity in conventional two-path interferometry

- H. Hofmann
- Physics
- 29 November 2008

It is shown that the condition for achieving the quantum Cramer-Rao bound of phase estimation in conventional two-path interferometers is that the state is symmetric with regard to an (unphysical)… Expand

Design parameters for a nano-optical Yagi–Uda antenna

- H. Hofmann, T. Kosako, Y. Kadoya
- Physics
- 23 March 2007

We investigate the possibility of directing optical emissions using a Yagi–Uda antenna composed of a finite linear array of nanoparticles. The relevant parameters characterizing the plasma resonances… Expand

Complementary classical fidelities as an efficient criterion for the evaluation of experimentally realized quantum operations.

- H. Hofmann
- Computer Science, Medicine
- Physical review letters
- 15 September 2004

It is shown that a good estimate of the fidelity of an experimentally realized quantum process can be obtained by measuring the outputs for only two complementary sets of input states. The number of… Expand

Violation of Leggett–Garg inequalities in quantum measurements with variable resolution and back-action

- Yutaro Suzuki, M. Iinuma, H. Hofmann
- Physics
- 29 June 2012

Quantum mechanics violates Leggett–Garg inequalities because the operator formalism predicts correlations between different spin components that would correspond to negative joint probabilities for… Expand

How weak values emerge in joint measurements on cloned quantum systems.

- H. Hofmann
- Physics, Medicine
- Physical review letters
- 25 November 2011

A statistical analysis of optimal universal cloning shows that it is possible to identify an ideal (but nonpositive) copying process that faithfully maps all properties of the original Hilbert space… Expand

Demonstration of an optical quantum controlled-NOT gate without path interference.

- R. Okamoto, H. Hofmann, S. Takeuchi, K. Sasaki
- Physics, Medicine
- Physical review letters
- 30 June 2005

We report the first experimental demonstration of an optical quantum controlled-NOT gate without any path interference, where the two interacting path interferometers of the original proposals have… Expand

Quantum phase gate for photonic qubits using only beam splitters and postselection

- H. Hofmann, S. Takeuchi
- Physics
- 19 November 2001

We show that a beam splitter of reflectivity one-third can be used to realize a quantum phase gate operation if only the outputs conserving the number of photons on each side are postselected.

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