Nonlinear Quantum Optics in a Waveguide: Distinct Single Photons Strongly
... While V-type systems [17] are also viable and reveal similar single photon switching behavior, the ladder-type configuration of InAs=GaAs quantum dots is attractive due to large (several nm) wavelength separation between biexciton transitions, which is crucial for efficient frequency filtering. For ...
... While V-type systems [17] are also viable and reveal similar single photon switching behavior, the ladder-type configuration of InAs=GaAs quantum dots is attractive due to large (several nm) wavelength separation between biexciton transitions, which is crucial for efficient frequency filtering. For ...
Quantum Dynamics as Generalized Conditional Probabilities
... ure of the generation of Y . For example, X may be the result of sending Y through a noisy channel described by a stoch Y trix ΓX|Y . (c) X and Y are the result of some common cause, described by a random variable Z. They may be observe r acelike separation from one another, provided the points wher ...
... ure of the generation of Y . For example, X may be the result of sending Y through a noisy channel described by a stoch Y trix ΓX|Y . (c) X and Y are the result of some common cause, described by a random variable Z. They may be observe r acelike separation from one another, provided the points wher ...
25 – 27 MAY 2016, ATHENS, GREECE
... 3+1D. The model generalises the 3+1D Kitaev quantum double replacing the finite group with a finite 2-group. Such a model describes a lattice realisation of BF-CG theory which is proposed to describe topological gauge theories which are both partially Higgsed and partially confined. Furthermore we p ...
... 3+1D. The model generalises the 3+1D Kitaev quantum double replacing the finite group with a finite 2-group. Such a model describes a lattice realisation of BF-CG theory which is proposed to describe topological gauge theories which are both partially Higgsed and partially confined. Furthermore we p ...
I t
... • In classical mechanics, there is no issue: – Any two states s,t are either the same (s=t), or different (st), and that’s all there is to it. ...
... • In classical mechanics, there is no issue: – Any two states s,t are either the same (s=t), or different (st), and that’s all there is to it. ...
Experimental demonstration of quantum correlations over more than
... pairs in optical fibers. To conclude this introduction, let us mention two of the fundamental issues. First there is the local-hidden-variable program. It seems clear that if there are no hidden variables after 10 m, there are also none after 10 km. Since our experiments improve the physical distanc ...
... pairs in optical fibers. To conclude this introduction, let us mention two of the fundamental issues. First there is the local-hidden-variable program. It seems clear that if there are no hidden variables after 10 m, there are also none after 10 km. Since our experiments improve the physical distanc ...
PDF
... In addition to being at the heart of the most fundamental tests of quantum mechanics [1,2], it is an essential resource that must be freely available for implementing many of the novel functions of quantum information processing [3]. In photonic systems, the ongoing developments in lasers, optical-f ...
... In addition to being at the heart of the most fundamental tests of quantum mechanics [1,2], it is an essential resource that must be freely available for implementing many of the novel functions of quantum information processing [3]. In photonic systems, the ongoing developments in lasers, optical-f ...
Coherence, Decoherence and Incoherence in Natural Light
... But even in-vivo, entire apparatus Irradiated (20 nm vs 500 nm). Hence, not localized excitation--- but full energy eigenstates. Situation similar in retinal re rates --- see K. Hoki and P. B., Proc. Chem. 3, 122 (2011); T. Tscherbul and PB (in prep) Oscillations do not necessarily imply coherent dy ...
... But even in-vivo, entire apparatus Irradiated (20 nm vs 500 nm). Hence, not localized excitation--- but full energy eigenstates. Situation similar in retinal re rates --- see K. Hoki and P. B., Proc. Chem. 3, 122 (2011); T. Tscherbul and PB (in prep) Oscillations do not necessarily imply coherent dy ...
Fault-Tolerant Quantum Computation
... FAULT-TOLERANT RECOVERY We need to ensure that the recovery part does not cause an error with probability of O The biggest concern in designing the recovery block: ...
... FAULT-TOLERANT RECOVERY We need to ensure that the recovery part does not cause an error with probability of O The biggest concern in designing the recovery block: ...
Spectroscopy of Atoms and Molecules
... light which interact with an atom. If an interacting photon’s energy matches that of an electronic transition within the atom, the photon can be absorbed. Conversely, an electronically excited atom can relax and emit a photon whose energy matches the atom’s electronic transition. These photons are d ...
... light which interact with an atom. If an interacting photon’s energy matches that of an electronic transition within the atom, the photon can be absorbed. Conversely, an electronically excited atom can relax and emit a photon whose energy matches the atom’s electronic transition. These photons are d ...
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.