Experimental one-way quantum computing
... have experimentally realized four-qubit cluster states encoded into the polarization state of four photons. We characterize the quantum state fully by implementing experimental four-qubit quantum state tomography. Using this cluster state, we demonstrate the feasibility of one-way quantum computing ...
... have experimentally realized four-qubit cluster states encoded into the polarization state of four photons. We characterize the quantum state fully by implementing experimental four-qubit quantum state tomography. Using this cluster state, we demonstrate the feasibility of one-way quantum computing ...
Security of Quantum Key Distribution Using d
... to eavesdropping of qudit-based schemes (i.e., schemes based on encoding the key on d-level systems). The only schemes that have been considered use either two bases for a four-level system [9] or four bases for a qutrit [10], but their security was investigated against simple nonoptimal attacks onl ...
... to eavesdropping of qudit-based schemes (i.e., schemes based on encoding the key on d-level systems). The only schemes that have been considered use either two bases for a four-level system [9] or four bases for a qutrit [10], but their security was investigated against simple nonoptimal attacks onl ...
Chapter 3
... concern. That colloquium denoted a turning-point in the history of physical science, simply because it made Schrödinger look for a way of deriving a wave equation to be associated with a given physical system. De Broglie, in developing and applying his matter-wave conjecture, had employed 'geometric ...
... concern. That colloquium denoted a turning-point in the history of physical science, simply because it made Schrödinger look for a way of deriving a wave equation to be associated with a given physical system. De Broglie, in developing and applying his matter-wave conjecture, had employed 'geometric ...
Precisely Timing Dissipative Quantum Information
... does not need to have any coherent unitary control over the quantum system but instead merely makes use of dissipative dynamics exhibiting quantum and classical features. Still, it is the very point of our schemes that, at the end of the day, the statistics of the measurement outcomes are exactly as ...
... does not need to have any coherent unitary control over the quantum system but instead merely makes use of dissipative dynamics exhibiting quantum and classical features. Still, it is the very point of our schemes that, at the end of the day, the statistics of the measurement outcomes are exactly as ...
Coupled quantum dots as quantum gates
... In view of this motivation we study in the following the spin dynamics of two laterally coupled quantum dots containing a single electron each. We show that the exchange coupling J(B,E,a) can be controlled by a magnetic field B ~leading to wave-function compression!, or by an electric field E ~leadi ...
... In view of this motivation we study in the following the spin dynamics of two laterally coupled quantum dots containing a single electron each. We show that the exchange coupling J(B,E,a) can be controlled by a magnetic field B ~leading to wave-function compression!, or by an electric field E ~leadi ...
Effective Field Theory Approach to Gravitationally Induced
... ~ r0 Þt=ðc2 @Þ is the gravitationwhere ¼ ½EVðr0 Þ EVð~ ally induced phase shift difference between the two ball states in the superposition. From Eqs. (20)–(22), we can interpret the phase shift as due in part to the difference in rest energies and in part to the difference in proper times e ...
... ~ r0 Þt=ðc2 @Þ is the gravitationwhere ¼ ½EVðr0 Þ EVð~ ally induced phase shift difference between the two ball states in the superposition. From Eqs. (20)–(22), we can interpret the phase shift as due in part to the difference in rest energies and in part to the difference in proper times e ...
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Decoherence and the Transition from Quantum to Classical–Revisited
... a suitable classical device could be found to carry out the task. In the absence of a crisp criterion to distinguish between quantum and classical, an identification of the classical with the macroscopic has often been tentatively accepted. The inadequacy of this approach has become apparent as a re ...
... a suitable classical device could be found to carry out the task. In the absence of a crisp criterion to distinguish between quantum and classical, an identification of the classical with the macroscopic has often been tentatively accepted. The inadequacy of this approach has become apparent as a re ...
Chapter 7 The Collapse of the Wave Function
... two different discrete values for the measurement on a given particle. It is from this observation that we know something like the collapse of the state vector happens. But what is it that makes something into a measurement? The answer is not obvious, and has led to various different interpretations ...
... two different discrete values for the measurement on a given particle. It is from this observation that we know something like the collapse of the state vector happens. But what is it that makes something into a measurement? The answer is not obvious, and has led to various different interpretations ...
- City Research Online
... deformation parameter β used in [2] by τ employed in [1]. It is well known that when given only a non-Hermitian Hamiltonian, the metric operator can not be uniquely determined. However, as argued in [1] with the specification of the observable X, which coincides in [2] and [1], the outcome is unique ...
... deformation parameter β used in [2] by τ employed in [1]. It is well known that when given only a non-Hermitian Hamiltonian, the metric operator can not be uniquely determined. However, as argued in [1] with the specification of the observable X, which coincides in [2] and [1], the outcome is unique ...
Strong-Disorder Fixed Point in the Dissipative Random Transverse-Field Ising Model
... To characterize the ground state properties of this system (1), we follow the idea of a real space renormalization group (RG) procedure introduced in Ref. [18] and pushed further in the context of the RTIC without dissipation in Ref. [3]. The strategy is to find the largest coupling in the chain, ei ...
... To characterize the ground state properties of this system (1), we follow the idea of a real space renormalization group (RG) procedure introduced in Ref. [18] and pushed further in the context of the RTIC without dissipation in Ref. [3]. The strategy is to find the largest coupling in the chain, ei ...
POISSON BOUNDARIES OVER LOCALLY COMPACT
... It is known that there exists a probability measure space (Π, ν), the Poisson boundary of (G, µ), such that L∞ (Π, ν) can be identified with the weak* closed subspace Hµ of L∞ (G) which consists of all µ-harmonic functions, i.e., functions h on G satisfying Φµ (h) = h. The noncommutative version of ...
... It is known that there exists a probability measure space (Π, ν), the Poisson boundary of (G, µ), such that L∞ (Π, ν) can be identified with the weak* closed subspace Hµ of L∞ (G) which consists of all µ-harmonic functions, i.e., functions h on G satisfying Φµ (h) = h. The noncommutative version of ...
Learning about order from noise Quantum noise studies of
... Experiments with 1D Bose gas Hofferberth et al. Nat. Physics 2008 ...
... Experiments with 1D Bose gas Hofferberth et al. Nat. Physics 2008 ...
The Need for Structure in Quantum Speedups
... OR function (because of Grover’s algorithm). On the other hand, as soon as we allow non-total functions, we can get enormous gaps. Aaronson [2] gave a Boolean function√f : S → {0, 1} for which R(f ) = N Ω(1) , yet Q(f ) = O (1).4 Other examples, for which R(f ) = Ω( N ) and Q(f ) = O(log N log log N ...
... OR function (because of Grover’s algorithm). On the other hand, as soon as we allow non-total functions, we can get enormous gaps. Aaronson [2] gave a Boolean function√f : S → {0, 1} for which R(f ) = N Ω(1) , yet Q(f ) = O (1).4 Other examples, for which R(f ) = Ω( N ) and Q(f ) = O(log N log log N ...