Van Der Gulik, Peter, Massar, Serge, Gilis, Dimitri, Buhrman, Harry, Rooman, Marianne
The issues we attempt to tackle here are what the first peptides did look like when they emerged on the primitive earth, and what simple catalytic activities they fulfilled. We conjecture that the...
Non-locality and Communication Complexity (2009)
Buhrman, Harry, Cleve, Richard, Massar, Serge, De Wolf, Ronald
Quantum information processing is the emerging field that defines and realizes computing devices that make use of quantum mechanical principles, like the superposition principle, entanglement, and...
Device-independent quantum key distribution secure against collective attacks (2009)
Pironio, Stefano, Acin, Antonio, Brunner, Nicolas, Gisin, Nicolas, Massar, Serge, Scarani, Valerio
Device-independent quantum key distribution (DIQKD) represents a relaxation of the security assumptions made in usual quantum key distribution (QKD). As in usual QKD, the security of DIQKD follows...
A Primer for Black Hole Quantum Physics (2007)
Brout, Robert, Massar, Serge, Parentani, Renaud, Spindel, Philippe
The mechanisms which give rise to Hawking radiation are revealed by analyzing in detail pair production in the presence of horizons. In preparation for the black hole problem, three preparatory...
Uncertainty Relation for the Discrete Fourier Transform (2007)
Massar, Serge, Spindel, Philippe
We derive an uncertainty relation for two unitary operators which obey a commutation relation of the form UV=exp[i phi] VU. Its most important application is to constrain how much a quantum state can...
Generation and amplification of Raman Stokes and anti-Stokes waves (2007)
Brainis, E., Clemmen, S., Massar, Serge
We present general analytical expressions of Stokes and anti-Stokes spectral photon-flux densities that are spontaneously generated by a single monochromatic pump wave propagating in a single-mode...
Huy, Kien Pan, Nguyen, Anh Tuan, Brainis, Edouard, Haelterman, Marc, Emplit, Philippe, Corbari, Costantino, ...
We present observations of quasi-phase matched parametric fluorescence in a periodically poled twin-hole silica fiber. The phase matching condition in the fiber enables the generation of a degenerate...
Uncertainty Relations for Positive Operator Valued Measures (2007)
How much unavoidable randomness is generated by a Positive Operator Valued Measure (POVM)? We address this question using two complementary approaches. First we study the variance of a real variable...
Device-independent security of quantum cryptography against collective attacks (2007)
Acin, Antonio, Brunner, Nicolas, Gisin, Nicolas, Massar, Serge, Pironio, Stefano, Scarani, Valerio
We present the optimal collective attack on a Quantum Key Distribution (QKD) protocol in the "device-independent" security scenario, where no assumptions are made about the way the QKD devices work...
Einstein-Podolsky-Rosen correlations between two uniformly accelerated oscillators (2006)
Massar, Serge, Spindel, Philippe
We consider the quantum correlations, i.e. the entanglement, between two systems uniformly accelerated with identical acceleration a in opposite Rindler quadrants which have reached thermal...
Efficient quantum key distribution secure against no-signalling eavesdroppers (2006)
Acin, Antonio, Massar, Serge, Pironio, Stefano
By carrying out measurements on entangled states, two parties can generate a secret key which is secure not only against an eavesdropper bound by the laws of quantum mechanics, but also against a...
Higher Order Harmonics of Modulational Instability Induced by Vacuum Fluctuations (2005)
Amans, David, Brainis, Edouard, Massar, Serge
We study the higher order harmonics of scalar modulational instability in the regime where it arises spontaneously through amplification of vacuum fluctuations. We obtain detailed predictions...
Security of Quantum Bit-String Generation (2004)
Barrett, Jonathan, Massar, Serge
We consider the cryptographic task of bit-string generation. This is a generalisation of coin tossing in which two mistrustful parties wish to generate a string of random bits such that an honest...
Provably Secure Experimental Quantum Bit-String Generation (2004)
Lamoureux, Louis-Philippe, Brainis, Edouard, Amans, David, Barrett, Jonathan, Massar, Serge
Coin tossing is a cryptographic task in which two parties who do not trust each other aim to generate a common random bit. Using classical communication this is impossible, but non trivial coin...
Popescu, Sandu, Groisman, Berry, Massar, Serge
The question of finding a lower bound on the number of Toffoli gates in a classical reversible circuit is addressed. A method based on quantum information concepts is proposed. The method involves...
The Extent of Multi-particle Quantum Non-locality (2004)
Jones, Nick S., Linden, Noah, Massar, Serge
It is well known that entangled quantum states can be nonlocal: the correlations between local measurements carried out on these states cannot always be reproduced by local hidden variable models....
Non-local correlations as an information theoretic resource (2004)
Barrett, Jonathan, Linden, Noah, Massar, Serge, Pironio, Stefano, Popescu, Sandu, Roberts, David
It is well known that measurements performed on spatially separated entangled quantum systems can give rise to correlations that are non-local, in the sense that a Bell inequality is violated. They...
Quantum Fingerprinting with a Single Particle (2003)
We show that the two slit experiment in which a single quantum particle interferes with itself can be interpreted as a quantum fingerprinting protocol: the interference pattern exhibited by the...
Quantum coin tossing and bit-string generation in the presence of noise (2003)
Barrett, Jonathan, Massar, Serge
We discuss the security implications of noise for quantum coin tossing protocols. We find that if quantum error correction can be used, so that noise levels can be made arbitrarily small, then...
Continuous-Variable Quantum Games (2002)
Li, Hui, Du, Jiangfeng, Massar, Serge
We investigate the quantization of games in which the players can access to a continuous set of classical strategies, making use of continuous-variable quantum systems. For the particular case of the...
Violation of local realism vs detection efficiency (2002)
Massar, Serge, Pironio, Stefano
We put bounds on the minimum detection efficiency necessary to violate local realism in Bell experiments. These bounds depends of simple parameters like the number of measurement settings or the...
Combinatorics and Quantum Nonlocality (2002)
Buhrman, Harry, Hoyer, Peter, Massar, Serge, Roehrig, Hein
We use techniques for lower bounds on communication to derive necessary conditions (in terms of detector efficiency or amount of super-luminal communication) for being able to reproduce the quantum...
A Zoology of Bell inequalities resistant to detector inefficiency (2002)
Massar, Serge, Pironio, Stefano, Roland, Jeremie, Gisin, Bernard
We derive both numerically and analytically Bell inequalities and quantum measurements that present enhanced resistance to detector inefficiency. In particular we describe several Bell inequalities...
Multipartite Greenberger-Horne-Zeilinger paradoxes for continuous variables (2002)
Massar, Serge, Pironio, Stefano
We show how to construct Greenberger-Horn-Zeilinger type paradoxes for continuous variable systems. We give two examples corresponding to 3 party and 5 party paradoxes. The paradoxes are revealed by...
Optimality of the genetic code with respect to protein stability and amino-acid frequencies (2001)
Gilis, Dimitri, Massar, Serge, Cerf, Nicolas J, Rooman, Marianne
Abstract Background The genetic code is known to be efficient in limiting the effect of mistranslation errors. A misread codon often codes for the same amino acid or one with similar biochemical...
Non locality, closing the detection loophole and communication complexity (2001)
It is shown that the detection loophole which arises when trying to rule out local realistic theories as alternatives for quantum mechanics can be closed if the detection efficiency $\eta$ is larger...
Greenberger-Horne-Zeilinger paradoxes for many qudits (2001)
Cerf, Nicolas J., Massar, Serge, Pironio, Stefano
We construct GHZ contradictions for three or more parties sharing an entangled state, the dimension d of each subsystem being an even integer greater than 2. The simplest example that goes beyond the...
How many photons are needed to distinguish two transparencies? (2001)
Mitchison, Graeme, Massar, Serge, Pironio, Stefano
We give a bound on the minimum number of photons that must be absorbed by any quantum protocol to distinguish between two transparencies. We show how a quantum Zeno method in which the angle of...
Greenberger-Horne-Zeilinger paradox for continuous variables (2001)
Massar, Serge, Pironio, Stefano
We show how to construct states for which a Greenberger-Horne-Zeilinger type paradox occurs if each party measures either the position or momentum of his particle. The paradox can be ascribed to the...
Minimal Absorption Measurements (2001)
Massar, Serge, Mitchison, Graeme, Pironio, Stefano
We show that it is not possible to discriminate two close transparencies without a certain number of photons being absorbed. We extend this to the discrimination of patterns of transparency (images).
Optimality of the genetic code with respect to protein stability and amino acid frequencies (2001)
Gilis, Dimitri, Massar, Serge, Cerf, Nicolas, Rooman, Marianne
How robust is the natural genetic code with respect to mistranslation errors? It has long been known that the genetic code is very efficient in limiting the effect of point mutation. A misread codon...
Optimal Cloning of Coherent States with a Linear Amplifier and Beam Splitters (2001)
Braunstein, Samuel L., Cerf, Nicolas J., Iblisdir, Sofyan, Massar, Serge, Van Loock, Peter
Optimal cloning of coherent states with a linear amplifier and beam splitters (2000)
Braunstein, Samuel L., Cerf, Nicolas J., Iblisdir, Sofyan, Van Loock, Peter, Massar, Serge
A transformation achieving the optimal symmetric N-to-M cloning of coherent states is presented. Its implementation only requires a phase-insensitive linear amplifier and a network of beam splitters....
Classical simulation of quantum entanglement without local hidden variables (2000)
Massar, Serge, Bacon, Dave, Cerf, Nicolas, Cleve, Richard
Recent work has extended Bell's theorem by quantifying the amount of communication required to simulate entangled quantum systems with classical information. The general scenario is that a bipartite...
"Interaction-free" discrimination between semi-transparent objects (2000)
Mitchison, Graeme, Massar, Serge
Absorption-free (also known as ``interaction-free'') measurement aims to detect the presence of an opaque object using a test particle without that particle being absorbed by the object. Here we...
State Estimation for Large Ensembles (2000)
this paper we present a new bound for W in the multiparameter case which is inspired by the discussion in [15]. This bound expresses in a natural way how one can trade information about one parameter...
Optimal Entanglement Enhancement for Mixed States (1999)
Kent, Adrian, Linden, Noah, Massar, Serge
We consider the actions of protocols involving local quantum operations and classical communication (LQCC) on a single system consisting of two separated qubits. We give a complete description of the...