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Quantum Control for Scientists and Engineers
Quantum Control for Scientists and Engineers

Daniel Adam Roberts - School of Natural Sciences
Daniel Adam Roberts - School of Natural Sciences

... In many of my papers, acknowledgments have been a space for sincere thanks, literal acknowledgments (of funding sources), and hidden jokes. This is made possible by the fact that in all of my papers, the acknowledgments have come at the end. In this work, we are instructed to do things sdrawkcab. It ...
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The effects of disorder in strongly interacting quantum systems
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...  When integrated over x, one gets the momentum density.  When integrated over p, one gets the probability density. ...
Quantum Computation with Nuclear Spins in Quantum Dots
Quantum Computation with Nuclear Spins in Quantum Dots

1 - Universität Stuttgart
1 - Universität Stuttgart

Completeness and the zx-calculus
Completeness and the zx-calculus

... is captured by the property of completeness, which means that any equality that can be derived using some standard formalism can also be derived graphically. In this thesis, I consider the zx-calculus, a graphical language for pure state qubit quantum mechanics. I show that it is complete for pure s ...
Spacetime foam and modified dispersion relations
Spacetime foam and modified dispersion relations

... L. Bombelli, J. Henson and R. D. Sorkin, “Discreteness without symmetry breaking: A Theorem,” Mod. Phys. Lett. A 24 (2009) 2579 [gr-qc/0605006]. ...
Improve The Convergence of Jarzynski Equality through Fast
Improve The Convergence of Jarzynski Equality through Fast

... concentrated work distribution for adiabatic process [13], we hope that adiabatic process would produce a better result. As the conventional adiabatic process takes a long time to accomplish, based on recent work on transitionless quantum driving [14], we accelerate the adiabatic process by adding a ...
Wholeness and the Implicate Order
Wholeness and the Implicate Order

Cavity quantum electrodynamics with three
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Springer Tracts in Modern Physics
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... the one side and macroscopic, traditional condensed-matter systems on the other side.1 These structures, which are less than or of the order of a micron in size, represent a challenge to experimentalists, since they demand elaborate fabrication processes and involve delicate measurements. The motiva ...
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... biexciton formation [4], excitation-induced dephasing (EID) [5], and excitation-induced shift (EIS) [6] describe the many-body interactions. Although conventional FWM spectroscopies have revealed rich information about excitons and carriers, there are some difficulties. Multiple electronic transitio ...
POLITesi - Politecnico di Milano
POLITesi - Politecnico di Milano

... In this PhD thesis we studied, designed, realized and tested custom instrumentation for cryogenic measurement, in particular measurement on quantum dot for quantum computing. This kind of investigation has huge application on cryptography, advanced physical simulation and single electron devices. In ...
Entanglement in many body quantum systems Arnau Riera Graells
Entanglement in many body quantum systems Arnau Riera Graells

... Departament d’Estructura i Constituents de la Matèria ...
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... to prefer more formal approaches, relying not on the set of theories of the so-called standard model but on tentative formal approaches that promise to give to quantum field theory the solid mathematical foundations that it does not have (see e.g. Fraser 2009). The particular characteristic of these ...
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Electronic structure of quantum dots
Electronic structure of quantum dots

ןב תטיסרבינוא - בגנב ןוירוג
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... injection. 18–20,43,44 Recently, several groups used this method to inject spin-polarized current from a FM/tunnel barrier contact into an S. 45–48 However, the spin polarization in the S has not exceeded 30% − 40%. To the best of our knowledge, currently there is no effective way to inject a ≈ 100% ...
PowerPoint 演示文稿 - at www.arxiv.org.
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Quantum Leap Gypsy Virtual Instrument Manual
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abstract
abstract

... minimum around a room temperature, the common logarithm of resistivity increases by four down to 5 K, below which the resistivity is almost temperature independent[1]. In order to explain such a metallic behavior in the low temperature regime observed by various measurements, the so-called in-gap st ...
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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.
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