A cavity-QED scheme for cluster-state quantum computing using crossed atomic beams

Blythe, Peter; Varcoe, Benjamin T. H.

doi:10.1088/1367-2630/8/10/231

Cited by 38 publications

(44 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similarly in [25], ions in an array of micro traps would be manipulated by a single ion read-write head. Alternatively in [26], the role of the memory is played by the quantised electromagnetic field in an array of cavities whilst Rydberg atoms traversing the cavities act as ancillas (similar ideas are contained in [27]). All of the above schemes possess a natural control-Z (dispersive) interaction between the ancilla and system qubits.…”

Section: Physical Implementationsmentioning

confidence: 99%

Twisted Graph States for Ancilla-driven Universal Quantum Computation

Kashefi

Browne

et al. 2009

Electronic Notes in Theoretical Computer Science

View full text Add to dashboard Cite

We introduce a new paradigm for quantum computing called Ancilla-Driven Quantum Computation (ADQC) which combines aspects both of the quantum circuit [1] and the one-way model [2] to overcome challenging issues in building large-scale quantum computers. Instead of directly manipulating each qubit to perform universal quantum logic gates or measurements, ADQC uses a fixed two-qubit interaction to couple the memory register of a quantum computer to an ancilla qubit. By measuring the ancilla, the measurement-induced back-action on the system performs the desired logical operations. The underlying mathematical model is based on a new entanglement resource called twisted graph states generated from non-commuting operators, leading to a surprisingly powerful structure for parallel computation compared to graph states obtained from commuting generators. [3]. The ADQC model is formalised in an algebraic framework similar to the Measurement Calculus [4]. Furthermore, we present the notion of causal flow for twisted graph states, based on the stabiliser formalism, to characterise the determinism. Finally we demonstrate compositional embedding between ADQC and both the one-way and circuit models which will allow us to transfer recently developed theory and toolkits of measurement-based quantum computing and quantum circuit models directly into ADQC.

show abstract

Section: Physical Implementationsmentioning

confidence: 99%

Twisted Graph States for Ancilla-driven Universal Quantum Computation

Kashefi

Browne

et al. 2009

Electronic Notes in Theoretical Computer Science

View full text Add to dashboard Cite

show abstract

“…Cluster states are highly entangled multipartite states that have attracted much interest since they were proposed by Raussendorf and Briegel [2] as a resource state with potential applications for one-way quantum computing. However, as with conventional approaches, issues of scalability arise [3,4]. Recent experimental advances have been made by Pysher et al [1] in the generation of a continuous-variable (CV) quadripartite cluster state from a single optical parametric oscillator (OPO), based on a proposal by Menicucci et al [5].…”

Section: Introductionmentioning

confidence: 99%

Spectral analysis of a four mode cluster state

Midgley

Olsen

2012

Laser Phys.

View full text Add to dashboard Cite

We theoretically evaluate the squeezed joint operators produced in a single optical parametric oscillator which generates quadripartite entangled outputs, as demonstrated experimentally by Pysher et al.[1][Phys. Rev. Lett. 107, 030505 (2011)]. Using a linearized fluctuation analysis we calculate the squeezing of the joint quadrature operators below threshold for a range of local oscillator phases and frequencies. These results add to the existing theoretical understanding of this potentially important system.

show abstract

“…With the help of a cavity, entanglement of atomic systems can be tested by probing the atomic states of the atoms leaving the cavity, or by a measurement of the cavity photons [24,39]. For example, the absence of fluorescence can be a signature for maximally entangled atom pairs which, in principle, can be used to create cluster states for one-way quantum computing [40]. An another scheme based on interactions in CQED has been proposed that uses a combination of the cavity field with atomic Raman transitions between a pair of long-lived atomic ground states [41][42][43][44][45].…”

Section: Introductionmentioning

confidence: 99%

Quantum entanglement and disentanglement of multi-atom systems

Ficek

2009

Front. Phys. China

View full text Add to dashboard Cite

We present a review of recent research on quantum entanglement, with special emphasis on entanglement between single atoms, processing of an encoded entanglement and its temporary evolution. Analysis based on the density matrix formalism are described. We give a simple description of the entangling procedure and explore the role of the environment in creation of entanglement and in disentanglement of atomic systems. A particular process we will focus on is spontaneous emission, usually recognized as an irreversible loss of information and entanglement encoded in the internal states of the system. We illustrate some certain circumstances where this irreversible process can in fact induce entanglement between separated systems. We also show how spontaneous emission reveals a competition between the Bell states of a two qubit system that leads to the recently discovered "sudden" features in the temporal evolution of entanglement. An another problem illustrated in details is a deterministic preparation of atoms and atomic ensembles in long-lived stationary squeezed states and entangled cluster states. We then determine how to trigger the evolution of the stable entanglement and also address the issue of a steered evolution of entanglement between desired pairs of qubits that can be achieved simply by varying the parameters of a given system.

show abstract

A cavity-QED scheme for cluster-state quantum computing using crossed atomic beams

Cited by 38 publications

References 48 publications

Twisted Graph States for Ancilla-driven Universal Quantum Computation

Twisted Graph States for Ancilla-driven Universal Quantum Computation

Spectral analysis of a four mode cluster state

Quantum entanglement and disentanglement of multi-atom systems

Contact Info

Product

Resources

About