Quantum Channels - Institut Camille Jordan
... to characterize them, to find useful representations of them. In particular we would like to find a representation of L which makes use only of ingredients coming from H,in the same way as for the density matrices whose strong point is that they are a given ingredient of H from which one can compute ...
... to characterize them, to find useful representations of them. In particular we would like to find a representation of L which makes use only of ingredients coming from H,in the same way as for the density matrices whose strong point is that they are a given ingredient of H from which one can compute ...
Experimental Demonstration of Higher Precision Weak-Value
... Meanwhile, the amplification effect of the weak value remains nearly unchanged. Therefore, the ultimate precision of the PRWV protocol can be increased and can surpass the precision limit of the SWV protocol (and also the classical protocol, which has been examined experimentally). To avoid the effe ...
... Meanwhile, the amplification effect of the weak value remains nearly unchanged. Therefore, the ultimate precision of the PRWV protocol can be increased and can surpass the precision limit of the SWV protocol (and also the classical protocol, which has been examined experimentally). To avoid the effe ...
QUANTUM PHASE ESTIMATION WITH ARBITRARY CONSTANT
... While Quantum phase estimation (QPE) is at the core of many quantum algorithms known to date, its physical implementation (algorithms based on quantum Fourier transform (QFT) ) is highly constrained by the requirement of high-precision controlled phase shift operators, which remain difficult to real ...
... While Quantum phase estimation (QPE) is at the core of many quantum algorithms known to date, its physical implementation (algorithms based on quantum Fourier transform (QFT) ) is highly constrained by the requirement of high-precision controlled phase shift operators, which remain difficult to real ...
98, 010506 (2007)
... 2 5 kHz [19], this method can be applied only through intermediate states which induce a much larger energy splitting between paired and unpaired atoms. Here we illustrate this reading out scheme using 40 K atoms, although the technique is applicable to other species as well. Suppose the atoms i ...
... 2 5 kHz [19], this method can be applied only through intermediate states which induce a much larger energy splitting between paired and unpaired atoms. Here we illustrate this reading out scheme using 40 K atoms, although the technique is applicable to other species as well. Suppose the atoms i ...
memory effects in the dynamics of open quantum systems
... for open quantum systems beyond the Markov approximation and to give insights into various features of memory effects. The objective is, in particular, to shed light on the different sources of memory effects and to further develop methods for harnessing them in order to realise controllable open quant ...
... for open quantum systems beyond the Markov approximation and to give insights into various features of memory effects. The objective is, in particular, to shed light on the different sources of memory effects and to further develop methods for harnessing them in order to realise controllable open quant ...
What Every Physicist Should Know About String Theory
... rhyme, with similar structures at different scales of lengths and energies. We will begin today with one of those rhymes – an analogy between the problem of quantum gravity and the theory of a single particle. ...
... rhyme, with similar structures at different scales of lengths and energies. We will begin today with one of those rhymes – an analogy between the problem of quantum gravity and the theory of a single particle. ...
73 013601 (2006)
... been done with ultracold atoms in periodically pulsed optical lattices 关4兴. However, most of the previous investigations have been focused on single-particle systems and the effects of interaction between particles have not received much attention 关5,6兴. In recent years, the realization of Bose-Eins ...
... been done with ultracold atoms in periodically pulsed optical lattices 关4兴. However, most of the previous investigations have been focused on single-particle systems and the effects of interaction between particles have not received much attention 关5,6兴. In recent years, the realization of Bose-Eins ...
Quantum boolean functions - Chicago Journal of Theoretical
... This paper draws heavily on the classical field of the analysis of boolean functions, which for our purposes essentially began with the seminal paper of Kahn, Kalai and Linial [KKL88], which proved that every balanced boolean function must have an influential variable (see Section 10). Since then, a ...
... This paper draws heavily on the classical field of the analysis of boolean functions, which for our purposes essentially began with the seminal paper of Kahn, Kalai and Linial [KKL88], which proved that every balanced boolean function must have an influential variable (see Section 10). Since then, a ...
Quantum Complementarity for the Superconducting Condensate and the Resulting Electrodynamic Duality. Abstract
... which one intends to measure ’the position of the electron’ [ read ’the phase of the superconductor’], otherwise these words have no meaning [3].” Today we might say that when we interpret experiments with quantum mechanics, we use a semi-classical approach and this approach requires that the quanti ...
... which one intends to measure ’the position of the electron’ [ read ’the phase of the superconductor’], otherwise these words have no meaning [3].” Today we might say that when we interpret experiments with quantum mechanics, we use a semi-classical approach and this approach requires that the quanti ...
Quasi Particle Tunneling in the Fractional Quantum Hall Regime
... reduced dimensionality as needed for structure like quantum dots and QPCs. The most common ways of achieving a 2DEG are by using a metal-oxidesemiconductor field-effect transistor (MOSFET) or a semiconducting heterostructure. The MOSFETs are not used anymore due to poor 2DEG qualities. The best 2DEG ...
... reduced dimensionality as needed for structure like quantum dots and QPCs. The most common ways of achieving a 2DEG are by using a metal-oxidesemiconductor field-effect transistor (MOSFET) or a semiconducting heterostructure. The MOSFETs are not used anymore due to poor 2DEG qualities. The best 2DEG ...
Building and bounding quantum Bernoulli factories
... are needed to create a coin with given bias and also give interesting examples of GCF1 algorithms. In addition, we lower bound quantum coin factories (QCFs), which use quoins to create coins, using known bounds on state discrimination and show how approximate QCFs can be designed from GCF1 s. Finall ...
... are needed to create a coin with given bias and also give interesting examples of GCF1 algorithms. In addition, we lower bound quantum coin factories (QCFs), which use quoins to create coins, using known bounds on state discrimination and show how approximate QCFs can be designed from GCF1 s. Finall ...
Information theoretic treatment of tripartite systems and quantum
... mation is that if information of a particular type corresponding to some orthonormal basis w of system a is perfectly present (perfect correlation, no noise) in system b for the quantum state under discussion, this prevents or excludes a type of information v corresponding to a basis mutually unbias ...
... mation is that if information of a particular type corresponding to some orthonormal basis w of system a is perfectly present (perfect correlation, no noise) in system b for the quantum state under discussion, this prevents or excludes a type of information v corresponding to a basis mutually unbias ...
Quantum key distribution
Quantum key distribution (QKD) uses quantum mechanics to guarantee secure communication. It enables two parties to produce a shared random secret key known only to them, which can then be used to encrypt and decrypt messages. It is often incorrectly called quantum cryptography, as it is the most well known example of the group of quantum cryptographic tasks.An important and unique property of quantum key distribution is the ability of the two communicating users to detect the presence of any third party trying to gain knowledge of the key. This results from a fundamental aspect of quantum mechanics: the process of measuring a quantum system in general disturbs the system. A third party trying to eavesdrop on the key must in some way measure it, thus introducing detectable anomalies. By using quantum superpositions or quantum entanglement and transmitting information in quantum states, a communication system can be implemented which detects eavesdropping. If the level of eavesdropping is below a certain threshold, a key can be produced that is guaranteed to be secure (i.e. the eavesdropper has no information about it), otherwise no secure key is possible and communication is aborted.The security of encryption that uses quantum key distribution relies on the foundations of quantum mechanics, in contrast to traditional public key cryptography which relies on the computational difficulty of certain mathematical functions, and cannot provide any indication of eavesdropping at any point in the communication process, or any mathematical proof as to the actual complexity of reversing the one-way functions used. QKD has provable security based on information theory, and forward secrecy.Quantum key distribution is only used to produce and distribute a key, not to transmit any message data. This key can then be used with any chosen encryption algorithm to encrypt (and decrypt) a message, which can then be transmitted over a standard communication channel. The algorithm most commonly associated with QKD is the one-time pad, as it is provably secure when used with a secret, random key. In real world situations, it is often also used with encryption using symmetric key algorithms like the Advanced Encryption Standard algorithm. In the case of QKD this comparison is based on the assumption of perfect single-photon sources and detectors, that cannot be easily implemented.