PowerPoint - Isaac Newton Institute
... Von Neumann entropy captures a most elementary counting of degrees of freedom ...
... Von Neumann entropy captures a most elementary counting of degrees of freedom ...
QUANTUM AND CLASSICAL STRONG DIRECT
... T S = Ω N 2 . We also show a lower bound of T 2 S = Ω N 3 for this problem in the quantum case. Both bounds are tight (the second within a logarithmic factor) if T is taken to be the number of queries to the inputs. We also get a lower bound of T 2 S = Ω N 5 for the problem of multiplying two matr ...
... T S = Ω N 2 . We also show a lower bound of T 2 S = Ω N 3 for this problem in the quantum case. Both bounds are tight (the second within a logarithmic factor) if T is taken to be the number of queries to the inputs. We also get a lower bound of T 2 S = Ω N 5 for the problem of multiplying two matr ...
University of Birmingham A New Optical Gain Model for Quantum
... In quantum well semiconductor optical devices, the gain curve is dependent on the wavelength, carrier density and carrier temperature. The passive RLC filter shown in Fig.1(a) is commonly used to model the symmetric frequencydependent gain curve [2]. The TLM model of this passive filter is shown in ...
... In quantum well semiconductor optical devices, the gain curve is dependent on the wavelength, carrier density and carrier temperature. The passive RLC filter shown in Fig.1(a) is commonly used to model the symmetric frequencydependent gain curve [2]. The TLM model of this passive filter is shown in ...
Invited talks - Swinburne University
... experimental system to investigate fundamental physics, ranging from quantum information science to simulations of condensed matter models. Here we go one step further and explore how cold atoms can be combined with other quantum systems to create new quantum hybrids with tailored properties. Coupli ...
... experimental system to investigate fundamental physics, ranging from quantum information science to simulations of condensed matter models. Here we go one step further and explore how cold atoms can be combined with other quantum systems to create new quantum hybrids with tailored properties. Coupli ...
Experiments with Entangled Photons Bell Inequalities, Non-local Games and Bound Entanglement
... and inseparability of the universe at a larger scale, makes it an astounding subject [1]. Although it contains such bizarre ideas, quantum mechanics has provided the basic framework for the most precise theories in human history. One of the most inexplicable ideas that quantum mechanics introduces i ...
... and inseparability of the universe at a larger scale, makes it an astounding subject [1]. Although it contains such bizarre ideas, quantum mechanics has provided the basic framework for the most precise theories in human history. One of the most inexplicable ideas that quantum mechanics introduces i ...
Quantum-like model of unconscious–conscious dynamics
... inequality (Asano et al., 2014). We point out that the Bell-type inequalities play an important role in modern quantum physics. If such an inequality is violated, then the data cannot fit a classical probability space. As was shown in our previous study (Asano et al., 2014), the data collected in a ...
... inequality (Asano et al., 2014). We point out that the Bell-type inequalities play an important role in modern quantum physics. If such an inequality is violated, then the data cannot fit a classical probability space. As was shown in our previous study (Asano et al., 2014), the data collected in a ...
Quantum Picture of the Josephson Junction
... Unlike the Harmonic Oscillator Potential, the energy spaces of the wash board potential are not equal. This is a significant quality of this system that makes it a candidate for qubit, as discussed later. The potential in my calculation and the eigenfunctions for the 4 lowest states are shown in Fig ...
... Unlike the Harmonic Oscillator Potential, the energy spaces of the wash board potential are not equal. This is a significant quality of this system that makes it a candidate for qubit, as discussed later. The potential in my calculation and the eigenfunctions for the 4 lowest states are shown in Fig ...
Physical Composition
... The thought that the material world has a natural compositional structure exerted a powerful hold on the imagination of scientists and philosophers long before they were taken to be practicing separate disciplines. Among rival conceptions of this structure upheld by various pre-Socratic thinkers, it ...
... The thought that the material world has a natural compositional structure exerted a powerful hold on the imagination of scientists and philosophers long before they were taken to be practicing separate disciplines. Among rival conceptions of this structure upheld by various pre-Socratic thinkers, it ...
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.