Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

arXiv:quant-ph/0001018 · Physical Review A

Quantum computation with mesoscopic superposition states

M. C. de Oliveira, William J. Munro

Published Mar 16, 2000• 52 citations
arXivHTMLPDF

Abstract

We present a strategy to engineer a simple cavity-QED two-bit universal quantum gate using mesoscopic distinct quantum superposition states. The dissipative effect on the decoherence and the amplitude damping of the quantum bits are analyzed and the critical parameters are presented.
DOI
10.1103/physreva.61.042309

Related papers

Simple cavity-QED two-bit universal quantum logic gate: The principle and expected performances

P. Domokos, J. M. Raimond, M. Brune +1 more

We present a simple scheme for a universal two-bit quantum logic gate using circular Rydberg atoms and a superconducting millimeter-wave cavity. We analyze in detail the performances of this gate, using the parameters of an experiment currently under way in our laboratory.

Physical Review A•Nov 1, 1995•176 citations

Scheme for efficient generation of mesoscopic field-state superposition in cavity QED

Carla Hermann-Avigliano, Nataly Cisternas, M. Brune +2 more

We present a simple scheme for the fast and efficient generation of quantum superpositions of two coherent fields with different classical amplitudes in a cavity. It relies on the simultaneous interaction of two two-level systems with the field. Their final detection with a high probability in the proper state projects the field onto the desired mesoscopic field state superposition. We show that the scheme is notably more efficient than those using a single atom. We discuss the method in the context of microwave cavity quantum electrodynamics, but it is also highly relevant for the thriving field of circuit QED. It may lead to interesting experimental studies of decoherence at the quantum-classical boundary.

Physical Review A•Jan 8, 2015•11 citations

Decoherence and a simple quantum computer

Isaac L. Chuang, Y. Yamamoto, Raymond Laflamme

The authors analyze the effect of decoherence on the operation of part of a simple quantum computer. The results indicate that quantum bit coding techniques may be used to mitigate the effects of two sources of decoherence - amplitude damping and phase randomization.

•Oct 1, 1995•5 citations

Mesoscopic quantum coherences in cavity QED: Preparation and decoherence monitoring schemes

L. Davidovich, M. Brune, J. M. Raimond +1 more

We present several schemes for preparing and detecting coherent superpositions of classically distinct states of the electromagnetic field in one or two high-Q cavities. These proposals are based on two-atom correlation measurements, to be performed on circular Rydberg atoms interacting dispersively with the cavity fields. Changing the time interval between the two detected atoms allows a monitoring of the decay of quantum coherence due to dissipation. \textcopyright{} 1996 The American Physical Society.

Physical Review A•Mar 1, 1996•267 citations

Continuous generation and stabilization of mesoscopic field superposition states in a quantum circuit

Ananda Roy, Zaki Leghtas, A. Douglas Stone +2 more

While dissipation is widely considered to be harmful for quantum coherence, it can, when properly engineered, lead to the stabilization of nontrivial pure quantum states. We propose a scheme for continuous generation and stabilization of Schr\"odinger cat states in a cavity using dissipation engineering. We first generate nonclassical photon states with definite parity by means of a two-photon drive and dissipation, and then stabilize these transient states against single-photon decay. The single-photon stabilization is autonomous, and is implemented through a second engineered bath, which exploits the photon-number-dependent frequency splitting due to Kerr interactions in the strongly dispersive regime of circuit QED. Starting with the Hamiltonian of the baths plus cavity, we derive an effective model of only the cavity photon states along with analytic expressions for relevant physical quantities, such as the stabilization rate. The deterministic generation of such cat states is one of the key ingredients in performing universal quantum computation.

arXiv:1411.0979•Physical Review A•Jan 7, 2015•25 citations

Realizable Universal Quantum Logic Gates

Tycho Sleator, Harald Weinfurter

We identify a 2-bit quantum gate that is sufficient to build any quantum logic network. The existence of such a 2-bit universal gate considerably simplifies the search for physical realizations of quantum computational networks. We propose an explicit construction of this gate, which is based on cavity QED techniques and may be realizable with current technology.

Physical Review Letters•May 15, 1995•513 citations
We present a simple scheme for the fast and efficient generation of quantum superpositions of two coherent fields with different classical amplitudes in a cavity. It relies on the simultaneous interaction of two two-level systems with the field. Their final detection with a high probability in the proper state projects the field onto the desired mesoscopic field state superposition. We show that the scheme is notably more efficient than those using a single atom. We discuss the method in the context of microwave cavity quantum electrodynamics, but it is also highly relevant for the thriving field of circuit QED. It may lead to interesting experimental studies of decoherence at the quantum-classical boundary.
We present several schemes for preparing and detecting coherent superpositions of classically distinct states of the electromagnetic field in one or two high-Q cavities. These proposals are based on two-atom correlation measurements, to be performed on circular Rydberg atoms interacting dispersively with the cavity fields. Changing the time interval between the two detected atoms allows a monitoring of the decay of quantum coherence due to dissipation. \textcopyright{} 1996 The American Physical Society.
While dissipation is widely considered to be harmful for quantum coherence, it can, when properly engineered, lead to the stabilization of nontrivial pure quantum states. We propose a scheme for continuous generation and stabilization of Schr\"odinger cat states in a cavity using dissipation engineering. We first generate nonclassical photon states with definite parity by means of a two-photon drive and dissipation, and then stabilize these transient states against single-photon decay. The single-photon stabilization is autonomous, and is implemented through a second engineered bath, which exploits the photon-number-dependent frequency splitting due to Kerr interactions in the strongly dispersive regime of circuit QED. Starting with the Hamiltonian of the baths plus cavity, we derive an effective model of only the cavity photon states along with analytic expressions for relevant physical quantities, such as the stabilization rate. The deterministic generation of such cat states is one of the key ingredients in performing universal quantum computation.