Experimental Demonstration of Quantum Fully Homomorphic Encryption with Application in a Two-Party Secure Protocol

A fully homomorphic encryption system hides data from unauthorized parties while still allowing them to perform computations on the encrypted data. Aside from the straightforward benefit of allowing users to delegate computations to a more powerful server without revealing their inputs, a fully homomorphic cryptosystem can be used as a building block in the construction of a number of cryptographic functionalities. Designing such a scheme remained an open problem until 2009, decades after the idea was first conceived, and the past few years have seen the generalization of this functionality to the world of quantum machines. Quantum schemes prior to the one implemented here were able to replicate some features in particular use cases often associated with homomorphic encryption but lacked other crucial properties, for example, relying on continual interaction to perform a computation or leaking information about the encrypted data. We present the first experimental realization of a quantum fully homomorphic encryption scheme. To demonstrate the versatility of a a quantum fully homomorphic encryption scheme, we further present a toy two-party secure computation task enabled by our scheme

Experimental Demonstration of Quantum Fully Homomorphic Encryption with Application in a Two-Party Secure Protocol

A fully homomorphic encryption system hides data from unauthorized parties, while still allowing them to perform computations on the encrypted data. Aside from the straightforward benefit of allowing users to delegate computations to a more powerful server without revealing their inputs, a fully homomorphic cryptosystem can be used as a building block in the construction of a number of cryptographic functionalities. Designing such a scheme remained an open problem until 2009, decades after the idea was first conceived, and the past few years have seen the generalization of this functionality to the world of quantum machines. Quantum schemes prior to the one implemented here were able to replicate some features in particular use-cases often associated with homomorphic encryption but lacked other crucial properties, for example, relying on continual interaction to perform a computation or leaking information about the encrypted data. We present the first experimental realisation of a quantum fully homomorphic encryption scheme. We further present a toy two-party secure computation task enabled by our scheme. Finally, as part of our implementation, we also demonstrate a post-selective two-qubit linear optical controlled-phase gate with a much higher post-selection success probability (1/2) when compared to alternate implementations, e.g. with post-selective controlled-$Z$ or controlled-$X$ gates (1/9).Comment: 11 pages, 16 figures, 2 table

Human convective boundary layer and its interaction with room ventilation flow

10.1111/ina.12120Indoor Air25121-3

Transmission electron microscopical studies of the layered structure of the ternary semiconductor CuIn₅Se₈

The structure of the off-stoichiometric In-rich ternary phase CuIn5Se8 was studied by means of electron diffraction and high-resolution electron microscopy. The compound shows a layered structure with a 7-layer stacking sequence of closed-packed planes, which contains both cubic and hexagonal stacking of Se atoms. The studied CuIn5Se8 bulk crystal is known as the b-phase of this compound

DEVELOPING A FRAMEWORK FOR SCRUTINIZING STRATEGIC GREEN ORIENTATION AND ORGANIZATIONAL PERFORMANCE WITH RELEVANCE TO THE SUSTAINABILITY OF TOURISM INDUSTRY

The purpose of this paper is to review the concept of sustainability, theoretical background and strategic green orientation (SGO) to develop an in-depth understands for the benefit of organizational performance (OP). Theoretical background outlines how triple bottom line and ecological modernization viewpoints relate with SGO and OP towards the sustainability to develop a research framework. The paper discloses a series of gaps in sustainability related theories and empirical research at business organizations and recommends a quantitative research approach and method for an empirical study on SGO of business organizations in tourism industry of Sri Lanka. Proposed study expects that new relationships could be discovered and theorized. This may address identified research gaps and would contribute to the body of knowledge. The findings of proposed research could be useful to future research initiatives on green business modeling for the sustainability in terms of triple bottom line: economic, environmental, and social performance.  Article visualizations

Stronger limits on hypothetical Yukawa interactions in the 40--8000 nm range

We report the results of new differential force measurements between a test mass and rotating source masses of gold and silicon to search for forces beyond Newtonian gravity at short separations. The technique employed subtracts the otherwise dominant Casimir force at the outset and, when combined with a lock-in amplification technique, leads to a significant improvement (up to a factor $10^{3}$) over existing limits on the strength (relative to gravity) of a putative force in the 40--8000 nm interaction range.Comment: New version, 5 pages, 5 figures. Accepted in Physical Review Letter