Preparing high purity initial states for nuclear magnetic resonance quantum computing

M S  Anwar; D  Blazina; H A  Carteret; S B  Duckett; T K  Halstead; J A  Jones; C M  Kozak; R J K  Taylor

doi:10.1103/PhysRevLett.93.040501

Preparing high purity initial states for nuclear magnetic resonance quantum computing

M S Anwar, D Blazina, H A Carteret, S B Duckett, T K Halstead, J A Jones, C M Kozak, R J K Taylor

Chemistry

Research output: Contribution to journal › Article › peer-review

Abstract

Here we demonstrate how parahydrogen can be used to prepare a two-spin system in an almost pure state which is suitable for implementing nuclear magnetic resonance quantum computation. A 12 ns laser pulse is used to initiate a chemical reaction involving pure parahydrogen (the nuclear spin singlet of H-2). The product, formed on the mus time scale, contains a hydrogen-derived two-spin system with an effective spin-state purity of 0.916. To achieve a comparable result by direct cooling would require an unmanageable (in the liquid state) temperature of 6.4 mK or an impractical magnetic field of 0.45 MT at room temperature. The resulting spin state has an entanglement of formation of 0.822 and cannot be described by local hidden variable models.

Original language	English
Pages (from-to)	-
Number of pages	4
Journal	Physical Review Letters
Volume	93
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevLett.93.040501
Publication status	Published - 23 Jul 2004

Keywords

PARAHYDROGEN-INDUCED POLARIZATION
MIXED STATES
DIHYDRIDE COMPLEXES
COMPUTATION
ENTANGLEMENT
SEPARABILITY
INFORMATION

Access to Document

10.1103/PhysRevLett.93.040501

http://dx.doi.org/10.1103/PhysRevLett.93.040501

Cite this

@article{4b5a79a61e514097807718f006f1436c,

title = "Preparing high purity initial states for nuclear magnetic resonance quantum computing",

abstract = "Here we demonstrate how parahydrogen can be used to prepare a two-spin system in an almost pure state which is suitable for implementing nuclear magnetic resonance quantum computation. A 12 ns laser pulse is used to initiate a chemical reaction involving pure parahydrogen (the nuclear spin singlet of H-2). The product, formed on the mus time scale, contains a hydrogen-derived two-spin system with an effective spin-state purity of 0.916. To achieve a comparable result by direct cooling would require an unmanageable (in the liquid state) temperature of 6.4 mK or an impractical magnetic field of 0.45 MT at room temperature. The resulting spin state has an entanglement of formation of 0.822 and cannot be described by local hidden variable models.",

keywords = "PARAHYDROGEN-INDUCED POLARIZATION, MIXED STATES, DIHYDRIDE COMPLEXES, COMPUTATION, ENTANGLEMENT, SEPARABILITY, INFORMATION",

author = "Anwar, {M S} and D Blazina and Carteret, {H A} and Duckett, {S B} and Halstead, {T K} and Jones, {J A} and Kozak, {C M} and Taylor, {R J K}",

year = "2004",

month = jul,

day = "23",

doi = "10.1103/PhysRevLett.93.040501",

language = "English",

volume = "93",

pages = "--",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "4",

}

TY - JOUR

T1 - Preparing high purity initial states for nuclear magnetic resonance quantum computing

AU - Anwar, M S

AU - Blazina, D

AU - Carteret, H A

AU - Duckett, S B

AU - Halstead, T K

AU - Jones, J A

AU - Kozak, C M

AU - Taylor, R J K

PY - 2004/7/23

Y1 - 2004/7/23

N2 - Here we demonstrate how parahydrogen can be used to prepare a two-spin system in an almost pure state which is suitable for implementing nuclear magnetic resonance quantum computation. A 12 ns laser pulse is used to initiate a chemical reaction involving pure parahydrogen (the nuclear spin singlet of H-2). The product, formed on the mus time scale, contains a hydrogen-derived two-spin system with an effective spin-state purity of 0.916. To achieve a comparable result by direct cooling would require an unmanageable (in the liquid state) temperature of 6.4 mK or an impractical magnetic field of 0.45 MT at room temperature. The resulting spin state has an entanglement of formation of 0.822 and cannot be described by local hidden variable models.

AB - Here we demonstrate how parahydrogen can be used to prepare a two-spin system in an almost pure state which is suitable for implementing nuclear magnetic resonance quantum computation. A 12 ns laser pulse is used to initiate a chemical reaction involving pure parahydrogen (the nuclear spin singlet of H-2). The product, formed on the mus time scale, contains a hydrogen-derived two-spin system with an effective spin-state purity of 0.916. To achieve a comparable result by direct cooling would require an unmanageable (in the liquid state) temperature of 6.4 mK or an impractical magnetic field of 0.45 MT at room temperature. The resulting spin state has an entanglement of formation of 0.822 and cannot be described by local hidden variable models.

KW - PARAHYDROGEN-INDUCED POLARIZATION

KW - MIXED STATES

KW - DIHYDRIDE COMPLEXES

KW - COMPUTATION

KW - ENTANGLEMENT

KW - SEPARABILITY

KW - INFORMATION

U2 - 10.1103/PhysRevLett.93.040501

DO - 10.1103/PhysRevLett.93.040501

M3 - Article

SN - 0031-9007

VL - 93

SP - -

JO - Physical Review Letters

JF - Physical Review Letters

IS - 4

ER -