Anand Natarajan

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Monitoring threats to information security is increasingly becoming important to protecting secured organizational documents. There is increasing number of threats to information security, which originates from the internal users of the system. Insider is defined as a trusted person and has access to classified documents. Our focus here is on understanding(More)
We introduce a simple two-player test which certifies that the players apply tensor products of Pauli σX and σZ observables on the tensor product of n EPR pairs. The test has constant robustness: any strategy achieving success probability within an additive ǫ of the optimal must be poly(ǫ)-close, in the appropriate distance measure, to the honest n-qubit(More)
The adsorption process of asphaltene onto molecularly smooth mica surfaces from toluene solutions of various concentrations (0.01-1 wt %) was studied using a surface forces apparatus (SFA). Adsorption of asphaltenes onto mica was found to be highly dependent on adsorption time and asphaltene concentration of the solution. The adsorption of asphaltenes led(More)
We present a stronger version of the Doherty-Parrilo-Spedalieri (DPS) hierarchy of approximations for the set of separable states. Unlike DPS, our hierarchy converges exactly at a finite number of rounds for any fixed input dimension. This yields an algorithm for separability testing which is singly exponential in dimension and polylogarithmic in accuracy.(More)
We introduce a method for using reductions to prove limitations on the ability of semidefinite programs (SDPs) to approximately solve optimization problems. We use this to show specifically that SDPs have limited ability to approximate two particularly important sets in quantum information theory: 1. The set of separable (i.e. unentangled) states. 2. The(More)
Semidefinite programs (SDPs) are a framework for exact or approximate optimization with widespread application in quantum information theory. We introduce a newmethod for using reductions to construct integrality gaps for SDPs, meaning instances where the SDP value is far from the true optimum. These are based on new limitations on the sum-of-squares (SoS)(More)
The Chinese writing system uses a set of tens of thousands of characters, each of which represents a syllable, and usually a morpheme, in the Chinese language. (In Chinese, almost all morphemes are monosyllabic). Although the number of distinct characters is very large, they have internal structure, and all of them are made out of a few hundred common(More)
We introduce a simple two-player test which certifies that the players apply tensor products of Pauli σ<sub><i>X</i></sub> and σ<sub><i>Z</i></sub> observables on the tensor product of <i>n</i> EPR pairs. The test has constant robustness: any strategy achieving success probability within an additive of the optimal must be <i>poly</i>(&#206;&#181;)-close,(More)
Nash equilibria always exist, but are widely conjectured to require time to find that is exponential in the number of strategies, even for two-player games. By contrast, a simple quasi-polynomial time algorithm, due to Lipton, Markakis and Mehta (LMM), can find approximate Nash equilibria, in which no player can improve their utility by more than by(More)