New Class of Quantum Error-Correcting Codes for a Bosonic Mode
... error rate is N times faster than for a single qubit. Thus, the quantum error-correction protocol must overcome this factor of N in order to reach the break-even point. If the errors are highly correlated, e.g., in the case of uniform magnetic field fluctuations in an ion trap, there may exist a dec ...
... error rate is N times faster than for a single qubit. Thus, the quantum error-correction protocol must overcome this factor of N in order to reach the break-even point. If the errors are highly correlated, e.g., in the case of uniform magnetic field fluctuations in an ion trap, there may exist a dec ...
Non-Abelian Anyons and Topological Quantum Computation
... particles are interchanged twice in a clockwise manner, their trajectory involves a non-trivial winding, and the system does not necessarily come back to the same state. This topological difference between two and three dimensions, first realized by Leinaas and Myrheim, 1977 and by Wilczek, 1982a, l ...
... particles are interchanged twice in a clockwise manner, their trajectory involves a non-trivial winding, and the system does not necessarily come back to the same state. This topological difference between two and three dimensions, first realized by Leinaas and Myrheim, 1977 and by Wilczek, 1982a, l ...
Emulating Quantum Computation
... algorithms or architectures is largely theoretical, and computer scientists have no way to realise their ideas. For example, we are a long way from implementing Shor’s polynomial time factoring algorithm which truly exemplifies the potential power of quantum computing [54, 55]. By creating emulation ...
... algorithms or architectures is largely theoretical, and computer scientists have no way to realise their ideas. For example, we are a long way from implementing Shor’s polynomial time factoring algorithm which truly exemplifies the potential power of quantum computing [54, 55]. By creating emulation ...
Multi-party Quantum Computation Adam Smith
... three notions of a neighborhood. The notion most often used for the analysis of quantum error-correction and fault-tolerance is insufficient for our needs, but we show that a very natural generalization—specific to so-called “css” codes, is adequate for our purposes. • Along the way, we provide modi ...
... three notions of a neighborhood. The notion most often used for the analysis of quantum error-correction and fault-tolerance is insufficient for our needs, but we show that a very natural generalization—specific to so-called “css” codes, is adequate for our purposes. • Along the way, we provide modi ...
Measurement Models for Quantum Zeno and anti
... In quantum mechanics there are two kinds of dynamical rules which are used to describe the observed time dependence of quantum states. For closed systems the unitary evolution according to the Schrödinger equation is valid. On the other hand, measured system experiences “reduction” or “collapse of ...
... In quantum mechanics there are two kinds of dynamical rules which are used to describe the observed time dependence of quantum states. For closed systems the unitary evolution according to the Schrödinger equation is valid. On the other hand, measured system experiences “reduction” or “collapse of ...
A Rigorous and Complete Proof of the Security of
... parties, Alice and Bob, to communicate securely over an untrusted channel, provided they have access to an authenticated classical channel. The first QKD protocol, BB84, appeared more than three decades ago [2] and the last 30 years have witnessed staggering experimental advances, making QKD the fir ...
... parties, Alice and Bob, to communicate securely over an untrusted channel, provided they have access to an authenticated classical channel. The first QKD protocol, BB84, appeared more than three decades ago [2] and the last 30 years have witnessed staggering experimental advances, making QKD the fir ...
Lindblad theory of dynamical decoherence of quantum-dot excitons P. R. Eastham,
... calculating the decay rates arising from system-bath coupling making use of the actual system Hamiltonian, including driving. This same point, of using the actual system Hamiltonian rather than a noninteracting approximation, is also crucial in describing the correct equilibrium state of strongly co ...
... calculating the decay rates arising from system-bath coupling making use of the actual system Hamiltonian, including driving. This same point, of using the actual system Hamiltonian rather than a noninteracting approximation, is also crucial in describing the correct equilibrium state of strongly co ...
Aspects of quantum information theory
... Quantum information and quantum computation have recently attracted a lot of interest. The promise of new technologies like safe cryptography and new “super computers”, capable of handling otherwise untractable problems, has excited not only researchers from many different fields like physicists, ma ...
... Quantum information and quantum computation have recently attracted a lot of interest. The promise of new technologies like safe cryptography and new “super computers”, capable of handling otherwise untractable problems, has excited not only researchers from many different fields like physicists, ma ...
DEPARTMENT OF PHYSICS Course Title Statistical Physics and
... Variational principles and Lagrange’s equations ...
... Variational principles and Lagrange’s equations ...
1 - Philsci
... derived from (1) and (2) would be justified if he added some further “formal locality principle”. Although they are not specific about what this principle may look like, it is probable that what they mean is something like “for all antecedents p referring to an event localized in a region R, there i ...
... derived from (1) and (2) would be justified if he added some further “formal locality principle”. Although they are not specific about what this principle may look like, it is probable that what they mean is something like “for all antecedents p referring to an event localized in a region R, there i ...
Geometrical Aspects of Conformal Quantum Field Theory
... In the early seventies, when the mysterious nature of nuclear forces was in the focus of scientific attention, string theory was invented to solve this mystery. Its most remarkable feature is that its basic constituents are not point particles—in contrast to all other theories before—but rather one– ...
... In the early seventies, when the mysterious nature of nuclear forces was in the focus of scientific attention, string theory was invented to solve this mystery. Its most remarkable feature is that its basic constituents are not point particles—in contrast to all other theories before—but rather one– ...
Quiet Readout of Superconducting Flux States
... problem is to reduce the back action by coupling the SQUID to the qubit weakly, as in the experiments of Friedman et al. [10]. This approach has the drawback, however, of reducing the signal by the same factor. Another technique, implemented by van der Wal et al. [9], uses a dc SQUID without resisti ...
... problem is to reduce the back action by coupling the SQUID to the qubit weakly, as in the experiments of Friedman et al. [10]. This approach has the drawback, however, of reducing the signal by the same factor. Another technique, implemented by van der Wal et al. [9], uses a dc SQUID without resisti ...
Certainty relations, mutual entanglement, and nondisplaceable
... there exists a mutually coherent state, but certainty relations are shown to be nontrivial for L 3 measurements. In the case of a prime power dimension, N = pk , and the number of measurements L = N + 1, the upper bound for the average entropy becomes minimal for a collection of mutually unbiased ...
... there exists a mutually coherent state, but certainty relations are shown to be nontrivial for L 3 measurements. In the case of a prime power dimension, N = pk , and the number of measurements L = N + 1, the upper bound for the average entropy becomes minimal for a collection of mutually unbiased ...
Superposition, Entanglement, and Raising Schrödinger’s Cat Nobel Lecture, December 8, 2012
... One of the obvious next steps was to isolate single ions. In addition to the aesthetic appeal of this, as for single electrons, the systematic errors in spectroscopy would be smallest in this case (Dehmelt 1982). By observing steps in the ion laser fluorescence, the Heidelberg group was able to isol ...
... One of the obvious next steps was to isolate single ions. In addition to the aesthetic appeal of this, as for single electrons, the systematic errors in spectroscopy would be smallest in this case (Dehmelt 1982). By observing steps in the ion laser fluorescence, the Heidelberg group was able to isol ...