11 research outputs found
Kvantu automÄtu un meklÄÅ”anas algoritmu iespÄjas un ierobežojumi
Kvantu skaitļoÅ”ana ir nozare, kas pÄta uz kvantu mehÄnikas likumiem balstÄ«to
skaitļoÅ”anas modeļu Ä«paŔības. DisertÄcija ir veltÄ«ta kvantu skaitļoÅ”anas
algoritmiskiem aspektiem. PiedÄvÄti rezultÄti trijos virzienos:
Kvantu galÄ«gi automÄti
AnalizÄta stÄvokļu efektivitÄte kvantu vienvirziena galÄ«gam automÄtam.
Uzlabota labÄka zinÄmÄ eksponenciÄlÄ atŔķirÄ«ba [AF98] starp
kvantu un klasiskajiem galÄ«gajiem automÄtiem.
Grovera algoritma analīze
PÄtÄ«ta Grovera algoritma noturÄ«ba pret kļūdÄm. VispÄrinÄts [RS08]
loÄ£isko kļūdu modelis un piedÄvÄti vairÄki jauni rezultÄti.
Kvantu klejoŔana
PÄtÄ«ta meklÄÅ”ana 2D režģī izmantojot kvantu klejoÅ”anu. PaÄtrinÄts
[AKR05] kvantu klejoÅ”anas meklÄÅ”anas algoritms.
AtslÄgas vÄrdi: Kvantu galÄ«gi automÄti, eksponenciÄlÄ atŔķirÄ«ba, Grovera
algoritms, noturÄ«ba pret kļūdÄm, kvantu klejoÅ”ana
LITERATÅŖRA
[AF98] A. Ambainis, R. Freivalds.
1-way quantum finite automata: strengths, weaknesses and generalizations.
Proceedings of the 39th IEEE Conference on Foundations of
Computer Science, 332-341, 1998.
arXiv:quant-ph/9802062v3
[AKR05] A. Ambainis, J. Kempe, A. Rivosh.
Coins make quantum walks faster.
Proceedings of SODAā05, 1099-1108, 2005.
[RS08] O. Regev, L. Schiff. Impossibility of a Quantum Speed-up with
a Faulty Oracle.
Proceedings of ICALPā2008, Lecture Notes in Computer Science,
5125:773-781, 2008.Quantum computation is the eld that investigates properties of models of
computation based on the laws of the quantum mechanics. The thesis is ded-
icated to algorithmic aspects of quantum computation and provides results
in three directions:
Quantum nite automata
We study space-eciency of one-way quantum nite automata. We
improve best known exponential separation [AF98] between quantum
and classical one-way nite automata.
Analysis of Grover's algorithm
We study fault-tolerance of Grover's algorithm. We generalize the
model of logical faults by [RS08] and present several new results.
Quantum walks
We study search by quantum walks on two-dimensional grid. We im-
prove (speed-up) quantum walk search algorithm by [AKR05].
Keywords: Quantum nite automata, exponential separation, Grover's al-
gorithm, fault-tolerance, quantum walks
BIBLIOGRAPHY
[AF98] A. Ambainis, R. Freivalds.
1-way quantum nite automata: strengths, weaknesses and gen-
eralizations.
Proceedings of the 39th IEEE Conference on Foundations of
Computer Science, 332-341, 1998.
arXiv:quant-ph/9802062v3
[AKR05] A. Ambainis, J. Kempe, A. Rivosh.
Coins make quantum walks faster.
Proceedings of SODA'05, 1099-1108, 2005.
[RS08] O. Regev, L. Schi. Impossibility of a Quantum Speed-up with
a Faulty Oracle.
Proceedings of ICALP'2008, Lecture Notes in Computer
Science, 5125:773-781, 2008
On the probability of finding marked connected components using quantum walks
Finding a marked vertex in a graph can be a complicated task when using
quantum walks. Recent results show that for two or more adjacent marked
vertices search by quantum walk with Grover's coin may have no speed-up over
classical exhaustive search. In this paper, we analyze the probability of
finding a marked vertex for a set of connected components of marked vertices.
We prove two upper bounds on the probability of finding a marked vertex and
sketch further research directions.Comment: 13 pages. To appear at Lobachevskii Journal of Mathematic
The Power and the Limits of Quantum Automata and Search Algorithms
ANOTÄCIJA
Kvantu skaitļoÅ”ana ir nozare, kas pÄta uz kvantu mehÄnikas likumiem balstÄ«to
skaitļoÅ”anas modeļu Ä«paŔības. DisertÄcija ir veltÄ«ta kvantu skaitļoÅ”anas
algoritmiskiem aspektiem. PiedÄvÄti rezultÄti trijos virzienos:
Kvantu galÄ«gi automÄti
AnalizÄta stÄvokļu efektivitÄte kvantu vienvirziena galÄ«gam automÄtam.
Uzlabota labÄka zinÄmÄ eksponenciÄlÄ atŔķirÄ«ba [AF98] starp
kvantu un klasiskajiem galÄ«gajiem automÄtiem.
Grovera algoritma analīze
PÄtÄ«ta Grovera algoritma noturÄ«ba pret kļūdÄm. VispÄrinÄts [RS08]
loÄ£isko kļūdu modelis un piedÄvÄti vairÄki jauni rezultÄti.
Kvantu klejoŔana
PÄtÄ«ta meklÄÅ”ana 2D režģī izmantojot kvantu klejoÅ”anu. PaÄtrinÄts
[AKR05] kvantu klejoÅ”anas meklÄÅ”anas algoritms.
AtslÄgas vÄrdi: Kvantu galÄ«gi automÄti, eksponenciÄlÄ atŔķirÄ«ba, Grovera
algoritms, noturÄ«ba pret kļūdÄm, kvantu klejoÅ”ana
LITERATÅŖRA
[AF98] A. Ambainis, R. Freivalds.
1-way quantum finite automata: strengths, weaknesses and generalizations.
Proceedings of the 39th IEEE Conference on Foundations of
Computer Science, 332-341, 1998.
arXiv:quant-ph/9802062v3
[AKR05] A. Ambainis, J. Kempe, A. Rivosh.
Coins make quantum walks faster.
Proceedings of SODAā05, 1099-1108, 2005.
[RS08] O. Regev, L. Schiff. Impossibility of a Quantum Speed-up with
a Faulty Oracle.
Proceedings of ICALPā2008, Lecture Notes in Computer Science,
5125:773-781, 2008.ABSTRACT
Quantum computation is the eld that investigates properties of models of
computation based on the laws of the quantum mechanics. The thesis is ded-
icated to algorithmic aspects of quantum computation and provides results
in three directions:
Quantum nite automata
We study space-eciency of one-way quantum nite automata. We
improve best known exponential separation [AF98] between quantum
and classical one-way nite automata.
Analysis of Grover's algorithm
We study fault-tolerance of Grover's algorithm. We generalize the
model of logical faults by [RS08] and present several new results.
Quantum walks
We study search by quantum walks on two-dimensional grid. We im-
prove (speed-up) quantum walk search algorithm by [AKR05].
Keywords: Quantum nite automata, exponential separation, Grover's al-
gorithm, fault-tolerance, quantum walks
BIBLIOGRAPHY
[AF98] A. Ambainis, R. Freivalds.
1-way quantum nite automata: strengths, weaknesses and gen-
eralizations.
Proceedings of the 39th IEEE Conference on Foundations of
Computer Science, 332-341, 1998.
arXiv:quant-ph/9802062v3
[AKR05] A. Ambainis, J. Kempe, A. Rivosh.
Coins make quantum walks faster.
Proceedings of SODA'05, 1099-1108, 2005.
[RS08] O. Regev, L. Schi. Impossibility of a Quantum Speed-up with
a Faulty Oracle.
Proceedings of ICALP'2008, Lecture Notes in Computer
Science, 5125:773-781, 2008
The Power and the Limits of Quantum Automata and Search Algorithms
ANOTÄCIJA
Kvantu skaitļoÅ”ana ir nozare, kas pÄta uz kvantu mehÄnikas likumiem balstÄ«to
skaitļoÅ”anas modeļu Ä«paŔības. DisertÄcija ir veltÄ«ta kvantu skaitļoÅ”anas
algoritmiskiem aspektiem. PiedÄvÄti rezultÄti trijos virzienos:
Kvantu galÄ«gi automÄti
AnalizÄta stÄvokļu efektivitÄte kvantu vienvirziena galÄ«gam automÄtam.
Uzlabota labÄka zinÄmÄ eksponenciÄlÄ atŔķirÄ«ba [AF98] starp
kvantu un klasiskajiem galÄ«gajiem automÄtiem.
Grovera algoritma analīze
PÄtÄ«ta Grovera algoritma noturÄ«ba pret kļūdÄm. VispÄrinÄts [RS08]
loÄ£isko kļūdu modelis un piedÄvÄti vairÄki jauni rezultÄti.
Kvantu klejoŔana
PÄtÄ«ta meklÄÅ”ana 2D režģī izmantojot kvantu klejoÅ”anu. PaÄtrinÄts
[AKR05] kvantu klejoÅ”anas meklÄÅ”anas algoritms.
AtslÄgas vÄrdi: Kvantu galÄ«gi automÄti, eksponenciÄlÄ atŔķirÄ«ba, Grovera
algoritms, noturÄ«ba pret kļūdÄm, kvantu klejoÅ”ana
LITERATÅŖRA
[AF98] A. Ambainis, R. Freivalds.
1-way quantum finite automata: strengths, weaknesses and generalizations.
Proceedings of the 39th IEEE Conference on Foundations of
Computer Science, 332-341, 1998.
arXiv:quant-ph/9802062v3
[AKR05] A. Ambainis, J. Kempe, A. Rivosh.
Coins make quantum walks faster.
Proceedings of SODAā05, 1099-1108, 2005.
[RS08] O. Regev, L. Schiff. Impossibility of a Quantum Speed-up with
a Faulty Oracle.
Proceedings of ICALPā2008, Lecture Notes in Computer Science,
5125:773-781, 2008.ABSTRACT
Quantum computation is the eld that investigates properties of models of
computation based on the laws of the quantum mechanics. The thesis is ded-
icated to algorithmic aspects of quantum computation and provides results
in three directions:
Quantum nite automata
We study space-eciency of one-way quantum nite automata. We
improve best known exponential separation [AF98] between quantum
and classical one-way nite automata.
Analysis of Grover's algorithm
We study fault-tolerance of Grover's algorithm. We generalize the
model of logical faults by [RS08] and present several new results.
Quantum walks
We study search by quantum walks on two-dimensional grid. We im-
prove (speed-up) quantum walk search algorithm by [AKR05].
Keywords: Quantum nite automata, exponential separation, Grover's al-
gorithm, fault-tolerance, quantum walks
BIBLIOGRAPHY
[AF98] A. Ambainis, R. Freivalds.
1-way quantum nite automata: strengths, weaknesses and gen-
eralizations.
Proceedings of the 39th IEEE Conference on Foundations of
Computer Science, 332-341, 1998.
arXiv:quant-ph/9802062v3
[AKR05] A. Ambainis, J. Kempe, A. Rivosh.
Coins make quantum walks faster.
Proceedings of SODA'05, 1099-1108, 2005.
[RS08] O. Regev, L. Schi. Impossibility of a Quantum Speed-up with
a Faulty Oracle.
Proceedings of ICALP'2008, Lecture Notes in Computer
Science, 5125:773-781, 2008