Carrier capture times in 1.5 - Technion
... (Received 19 August 1991; accepted for publication 21 October 1991) The carrier capture times in multiple quantum well semiconductor amplifiers of different structures are studied under high plasma density conditions. Fast ( < 1 ps), slow ( > 150 ps), and intermediate time constants (2-7 ps) are ide ...
... (Received 19 August 1991; accepted for publication 21 October 1991) The carrier capture times in multiple quantum well semiconductor amplifiers of different structures are studied under high plasma density conditions. Fast ( < 1 ps), slow ( > 150 ps), and intermediate time constants (2-7 ps) are ide ...
Transition Probabilities and Selection Rules
... 1909 Å line. 3. Magnetic Dipole Magnetic dipole and electric quadrupole transition probabilities can be derived in a similar way from the classical formulae. Generally, one only considers these transition probabilities when the electric dipole transition probability vanishes, that is, for forbidden ...
... 1909 Å line. 3. Magnetic Dipole Magnetic dipole and electric quadrupole transition probabilities can be derived in a similar way from the classical formulae. Generally, one only considers these transition probabilities when the electric dipole transition probability vanishes, that is, for forbidden ...
Quantum Field Theory and Coalgebraic Logic in Theoretical
... These neurophysiological studies suggest that the DDF based on a coalgebraic modeling of open systems in QFT could be, in computer science, an effective possible solution of the problem, so-called of “deep learning”, arising with “big-data” modeling and, overall, in dealing with an effective computa ...
... These neurophysiological studies suggest that the DDF based on a coalgebraic modeling of open systems in QFT could be, in computer science, an effective possible solution of the problem, so-called of “deep learning”, arising with “big-data” modeling and, overall, in dealing with an effective computa ...
Dirac Notation 1 Vectors
... Functions can be considered to be vectors in an infinite dimensional space, provided that they are normalizable. In quantum mechanics, wave functions can be thought of as vectors in this space. We will denote a quantum state as |ψi. This state is normalized if we make it have unit norm: hψ|ψi = 1. M ...
... Functions can be considered to be vectors in an infinite dimensional space, provided that they are normalizable. In quantum mechanics, wave functions can be thought of as vectors in this space. We will denote a quantum state as |ψi. This state is normalized if we make it have unit norm: hψ|ψi = 1. M ...
Cavity dark states for quantum computing M.S. Shahriar , J.A. Bowers
... eective rate of decoherence due to cavity photon decay is thus reduced by nearly three orders of magnitude. Thus, the cavity dark state described here achieves the desired transfer of quantum information without being aected signi®cantly by the cavity decay, and yet does not take much longer than ...
... eective rate of decoherence due to cavity photon decay is thus reduced by nearly three orders of magnitude. Thus, the cavity dark state described here achieves the desired transfer of quantum information without being aected signi®cantly by the cavity decay, and yet does not take much longer than ...
Almost all pure quantum states are almost maximally entangled
... not an obvious conclusion from Eq. (2). First, observe that the square of a density matrix tr ρ2A does not have an immediate physical interpretation. From this result alone it is unclear how to quantify the physical distance between the expected local state and the maximally mixed state. Second, not ...
... not an obvious conclusion from Eq. (2). First, observe that the square of a density matrix tr ρ2A does not have an immediate physical interpretation. From this result alone it is unclear how to quantify the physical distance between the expected local state and the maximally mixed state. Second, not ...
Interaction-based nonlinear quantum metrology with a cold atomic ensemble
... In this manuscript we present an experimental and theoretical investigation of quantum-noise-limited measurement by nonlinear interferometry, or from another perspective, quantumnoise-limited interaction-based measurement. The experimental work is performed using a polarization-based quantum interfa ...
... In this manuscript we present an experimental and theoretical investigation of quantum-noise-limited measurement by nonlinear interferometry, or from another perspective, quantumnoise-limited interaction-based measurement. The experimental work is performed using a polarization-based quantum interfa ...
- Philsci
... communicate results as if between you and your friend, axons provably unite consciousness, and if this is achieved by quantum coherence then they must at any rate extend the quantum coherent states. The observation that some cortical neurons do not have axons must not be erroneously interpreted in ...
... communicate results as if between you and your friend, axons provably unite consciousness, and if this is achieved by quantum coherence then they must at any rate extend the quantum coherent states. The observation that some cortical neurons do not have axons must not be erroneously interpreted in ...
GAP Optique Geneva University
... Realistic Physics Theories • In the physics literature one finds essentially two characterizations: 1. All measurement outcomes are determined by the state of the physical system. In other words, at any time all physical quantities have their value somehow written in the physical system (these may c ...
... Realistic Physics Theories • In the physics literature one finds essentially two characterizations: 1. All measurement outcomes are determined by the state of the physical system. In other words, at any time all physical quantities have their value somehow written in the physical system (these may c ...
Adiabatic Quantum State Generation and Statistical Zero Knowledge
... the unitary matrix e−itH(s) can be approximated by a quantum circuit to within any polynomial accuracy for any polynomially bounded time t. Thus, we still use the standard model of quantum circuits in our paradigm. However, our goal is to derive quantum circuits solving the state generation problem, ...
... the unitary matrix e−itH(s) can be approximated by a quantum circuit to within any polynomial accuracy for any polynomially bounded time t. Thus, we still use the standard model of quantum circuits in our paradigm. However, our goal is to derive quantum circuits solving the state generation problem, ...
A quantum physical argument for panpsychism - Philsci
... perception states. Different from these seemingly extreme views, it is widely thought that the quantum-to-classical transition and consciousness are essentially independent with each other (see, e.g. Nauenberg (2007) for a recent review). At first sight, this common-sense view seems too evident to ...
... perception states. Different from these seemingly extreme views, it is widely thought that the quantum-to-classical transition and consciousness are essentially independent with each other (see, e.g. Nauenberg (2007) for a recent review). At first sight, this common-sense view seems too evident to ...
CN 2015 5 - SNGCE DIGITAL LIBRARY
... authentication and access control to protect the networks from unauthorized traffic. This is known as firewalls Firewall system is an electronic security guard and electronic ...
... authentication and access control to protect the networks from unauthorized traffic. This is known as firewalls Firewall system is an electronic security guard and electronic ...
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.