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### Creating A Superposition Of Unknown Quantum States

The superposition principle is one of the landmarks of quantum mechanics. The importance of quantum superpositions provokes questions about the limitations that quantum mechanics itself imposes on the possibility of their generation. In this work, we systematically study the problem of the creation of superpositions of unknown quantum states. First, we prove a no-go theorem that forbids the existence of a universal probabilistic quantum protocol producing a superposition of two unknown quantum states. Second, we provide an explicit probabilistic protocol generating a superposition of two unknown states, each having a fixed overlap with the known referential pure state. The protocol can be applied to generate coherent superposition of results of independent runs of subroutines in a quantum computer. Moreover, in the context of quantum optics it can be used to efficiently generate highly nonclassical states or non-Gaussian states. Mar 17, 2016 ... The superposition principle is one of the landmarks of quantum mechanics. The importance of quantum superpositions provokes questions about ...
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### Collapsing A Perfect Superposition To A Chosen Quantum State ...

Given a perfect superposition of states on a quantum system of qubits. We propose a fast quantum algorithm for collapsing the perfect superposition to a chosen quantum state without applying any measurements. The basic idea is to use a phase destruction mechanism. Two operators are used, the first operator applies a phase shift and a temporary entanglement to mark in the superposition, and the second operator applies selective phase shifts on the states in the superposition according to their Hamming distance with . The generated state can be used as an excellent input state for testing quantum memories and linear optics quantum computers. We make no assumptions about the used operators and applied quantum gates, but our result implies that for this purpose the number of qubits in the quantum register offers no advantage, in principle, over the obvious measurement-based feedback protocol. Aug 1, 2014 ... Given a perfect superposition of states on a quantum system of qubits. We propose a fast quantum algorithm for collapsing the perfect ...
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### Superposition And Entanglement

Repository containing the front-end of the Quantum Inspire project. The projects consists of an in-browser editor that allows the user to write and run/simulate quantum algorithms written in QASM. Also, users can access information about quantum computing concepts. Superposition is one of the fundamental principles of quantum mechanics. In classical physics, a wave describing a musical tone can be seen as several waves ...
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### How Big Can The Quantum World Be? Physicists Probe The Limits ...

By showing that even large objects can exhibit bizarre quantum behaviors, physicists hope to illuminate the mystery of quantum collapse, identify the quantum nature of gravity, and perhaps even make… Aug 18, 2021 ... A quantum particle in a superposition, contrary to common belief, is not really in two (or more) states at once. Rather, a superposition ...
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### Creation And Measurement Of A Coherent Superposition Of Quantum ...

We demonstrate experimental techniques for creating and measuring a coherent superposition of two degenerate atomic states with equal amplitudes in metastable neon. Starting from state (3)P(0), we create adiabatically a coherent superposition of the magnetic sublevels M=+/-1 of the state (3)P(2) usi … We demonstrate experimental techniques for creating and measuring a coherent superposition of two degenerate atomic states with equal amplitudes in ...
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### Quantum Superposition - Wikipedia

It states that, much like waves in classical physics, any two (or more) quantum states can be added together ("superposed") and the result will be another valid ...
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### Superposition State - An Overview | ScienceDirect Topics

Superpositions of Quantum States ... The superposition principle: every vector (ray) in the Hilbert space corresponds to a possible state; given two states, | φ〉 ...
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### Quantum Superposition Of Macroscopic Persistent-Current States

Microwave spectroscopy experiments have been performed on two quantum levels of a macroscopic superconducting loop with three Josephson junctions. Level repulsion of the ground state and first excited state is found where two classical persistent-current ... The two classical states are coupled via quantum tunneling through the barrier ... The symmetric superposition state is the quantum mechanical ground state ...
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### Growing Macroscopic Superposition States Via Cavity Quantum ...

Sep 19, 2018 ... Growing macroscopic superposition states via cavity quantum optomechanics. Jack Clarke1,2 and Michael R Vanner1,2.
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**The pages related to superposition of quantum states are also listed below: **

### Quantum For Dummies: The Basics Explained | E&T Magazine

Professor Alan Woodward from the University of Surrey attempts to demystify the quantum world by explaining key terminology and theory. Apr 16, 2019 ... Superposition is a system that has two different states that can define it and it's possible for it to exist in both. For example, in physical ...
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### Single-atom Gating Of Quantum-state Superpositions | Nature Physics

Apr 6, 2008 ... Unprecedented control over the superposition of electronic states of a 'quantum coral', by changing the position of a single atom within it, ...
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