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Quantum Clock Synchronization with one qubit
[article]

2001
*
arXiv
*
pre-print

Chuang's

arXiv:cs/0103021v3
fatcat:lyeu3b5xzje4dcaejlv6gnr5eu
*quantum**clock**synchronization*algorithm and show that it is possible to obtain T to n bits of accuracy while communicating only*one**qubit*in*one*direction and using an O(2^n) frequency range. ... The*clock**synchronization*problem is to determine the time difference T between two spatially separated parties. We improve*on*I. ... Recently, two new*quantum*protocols have been proposed for*synchronizing*remote*clocks*. ...##
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Quantum methods for clock synchronization: Beating the standard quantum limit without entanglement

2005
*
Physical Review A. Atomic, Molecular, and Optical Physics
*

We introduce methods for

doi:10.1103/physreva.72.042301
fatcat:z3npcqkoojdqliurncy44b5xsu
*clock**synchronization*that make use of the adiabatic exchange of nondegenerate two-level*quantum*systems: ticking*qubits*. ... Schemes involving the exchange of N independent*qubits**with*frequency ω give a*synchronization*accuracy that scales as (ω√(N))^-1, i.e., as the standard*quantum*limit. ... Simple*one*-way protocol The simplest ticking*qubit**clock**synchronization*protocol based*on*Eddington's slow*clock*transport proceeds as follows. ...##
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Optimized multiparty quantum clock synchronization

2011
*
Physical Review A. Atomic, Molecular, and Optical Physics
*

A multi-party protocol for distributed

doi:10.1103/physreva.84.014301
fatcat:hevgq6a5z5b4xhezyou6vbvx4u
*quantum**clock**synchronization*has been claimed to provide universal limits*on*the*clock*accuracy, viz. that accuracy monotonically decreases*with*the number n of ... But, this is only true for*synchronization*when*one*limits oneself to W-states. ... Essentials of*Quantum**Clock**Synchronization**Quantum**clock**synchronization*is based upon preparation of entangled states, to be later used for*synchronization*. ...##
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Quantum Algorithm for Distributed Clock Synchronization

2000
*
Physical Review Letters
*

*On*the other hand, as we show, there exists a

*quantum*algorithm to obtain n digits of Δ while communicating only O(n)

*quantum*messages. ... The

*clock*

*synchronization*problem is to determine the time difference Δ between two spatially separated

*clocks*. ... These results invite further consideration of the problem of

*clock*

*synchronization*

*with*the assistance of

*quantum*resources. ...

##
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FPGA-based electronic system for the control and readout of superconducting quantum processors
[article]

2022
*
arXiv
*
pre-print

The system supports

arXiv:2110.07965v4
fatcat:necrymeghvgqtdekvttjundwfa
*synchronous*control of*qubits**with*jitters of approximately 5 ps. ... Here, we present a field-programmable gate array (FPGA)-based electronic system*with*a distributed*synchronous**clock*and trigger architecture. ...*On*the basis of*clock**synchronization*, we propose an FPGA-based trigger system. ...##
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FPGA-based electronic system for the control and readout of superconducting quantum processors

2022
*
Review of Scientific Instruments
*

The system supports

doi:10.1063/5.0085467
pmid:35922305
fatcat:3qqi5pes4zethjxsgbw3vej274
*synchronous*control of*qubits**with*jitters of ∼5 ps. ... Here, we present a field-programmable gate array (FPGA)-based electronic system*with*a distributed*synchronous**clock*and trigger architecture. ... The*clock*system ensures that each module has a*synchronous*digital processing*clock*and a*synchronous*sampling*clock*. Based*on**clock**synchronization*, we propose an FPGA-based trigger system. ...##
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Entangled quantum clocks for measuring proper-time difference

2002
*
European Physical Journal D : Atomic, Molecular and Optical Physics
*

We report that entangled pairs of

doi:10.1140/epjd/e20020065
fatcat:3it2sfrclfectcuz53fdn2mcce
*quantum**clocks*(non-degenerate*quantum*bits) can be used as a specialized detector for precisely measuring difference of proper-times that each constituent*quantum**clock*... We describe why the proposed scheme would be more precise in the measurement of proper-time difference than a scheme of two-separate-*quantum*-*clocks*. ...*Quantum**clock**synchronization*is a new possible application of*quantum*entanglement: two remotely separated participants Alice and Bob can*synchronize*their*clocks*, provided that they share pairs of*quantum*...##
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Operation-triggered quantum clock synchronization

2015
*
Physical Review A. Atomic, Molecular, and Optical Physics
*

We present a novel

doi:10.1103/physreva.92.032321
fatcat:4muqm74e6zhp7phc73h6fgigca
*quantum**clock**synchronization*(QCS) scheme of multiple parties which uses operation as the trigger to start the evolution of the initial state, where existing QCS protocols use measurement ... We also show that our protocol is very efficient in*synchronizing*a*clock*to the average time of other*clocks*. ... Optimization and limiting issues in the*quantum**clock*literature have been dealt*with*,*with*respect to QCS [9] [10] [11] [12] . Experimental work has also been done*on*QCS implementation. ...##
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Quantum clock synchronization: Multiparty protocol

2002
*
Physical Review A. Atomic, Molecular, and Optical Physics
*

We present a multi-party

doi:10.1103/physreva.66.024305
fatcat:ewjxzzjmufbdpcfdtfz2lytzde
*quantum**clock**synchronization*protocol that utilizes shared prior entanglement and broadcast of classical information to*synchronize*spatially separated*clocks*. ... Notably, it is necessary only for any*one*party to publish classical information. Consequently, the efficacy of the method is independent of the relative location of the parties. ... Introduction*Clock**synchronization*has been the focus of intense study*with*the potential for both commercial and scientific rewards. ...##
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Quantum clock synchronization and quantum error correction
[article]

2000
*
arXiv
*
pre-print

This paper is based

arXiv:quant-ph/0010098v1
fatcat:77ulvp5xbfadhcwflvczfrfeom
*on*a talk given at the NASA-DoD Workshop*on**Quantum*Information and*Clock**Synchronization*for Space Applications (QuICSSA), September 25-26, 2000. ... I consider*quantum*protocols for*clock**synchronization*, and investigate in particular whether entanglement distillation or*quantum*error-correcting codes can improve the robustness of these protocols. ...*clock**on*demand every time we need to*synchronize*. ...##
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Criterion for remote clock synchronization with Heisenberg-scaling accuracy

2013
*
Physical Review A. Atomic, Molecular, and Optical Physics
*

We propose a

doi:10.1103/physreva.88.052314
fatcat:r3qfty5b3veaxiyyqkijja3pae
*quantum*method to judge whether two spatially separated*clocks*have been*synchronized*within a specific accuracy σ. ...*On*sharing the 2N-*qubit*bipartite maximally entangled state in this scheme, the accuracy of judgement can be enhanced to σ∼π/(ω(N+1)). ...*Quantum**clock**synchronization**with*Bell state and GHZ state. ...##
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On decoherence in quantum clock synchronization

2006
*
Laser physics
*

We study two

doi:10.1134/s1054660x06110065
fatcat:hg2x5obrujdklbf7tsmt7u4ryq
*quantum*versions of the Eddington*clock*-*synchronization*protocol in the presence of decoherence. ... We show the equivalence of the two protocols under any single-*qubit*decoherence model that does not itself provide*synchronization*information. ... There are two interesting*quantum*versions of the Eddington protocol for*clock**synchronization*, which classically involves Alice (adiabatically) sending to Bob a "watch"*synchronized**with*her*clock*. ...##
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Clock synchronization using maximal multipartite entanglement

2012
*
Physical Review A. Atomic, Molecular, and Optical Physics
*

We propose a multi party

doi:10.1103/physreva.86.014301
fatcat:byi7cpz3lfbufbpukoj6gmzi4e
*quantum**clock**synchronization*protocol that makes optimal use of the maximal multipartite entanglement of GHZ-type states. ... The maximal sensitivity of the entangled states to time differences between the local*clocks*can then be accessed if all parties share the results of their local time dependent measurements. ... INTRODUCTION*Quantum**clock**synchronization*protocols are of fundamental interest in*quantum*information, since they can illustrate how information about time is encoded in*quantum*systems. ...##
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Quantum Clock Synchronization Based on Shared Prior Entanglement

2000
*
Physical Review Letters
*

We demonstrate that two spatially separated parties (Alice and Bob) can utilize shared prior

doi:10.1103/physrevlett.85.2010
pmid:10970670
fatcat:coyhccn75fea3h5mzpaf6p7e6i
*quantum*entanglement, and classical communications, to establish a*synchronized*pair of atomic*clocks*. ... In contrast to classical*synchronization*schemes, the accuracy of our protocol is independent of Alice or Bob's knowledge of their relative locations or of the properties of the intervening medium. ... Our proposed method of*Quantum**Clock**Synchronization*(QCS) has features in common*with*Ekert's entanglement-based*quantum*keydistribution protocol [5] in which Alice and Bob initially share only prior-entangled ...##
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Nuclear magnetic resonance implementation of a quantum clock synchronization algorithm

2004
*
Physical Review A. Atomic, Molecular, and Optical Physics
*

The

doi:10.1103/physreva.70.062322
fatcat:bl5laqebgzcbxbd3atoozoqxha
*quantum**clock**synchronization*algorithm proposed by I. L. Chuang (Phys. Rev. Lett, 85, 2006(2000)) has been implemented in a three*qubit*nuclear magnetic resonance*quantum*system. ... The time difference between two separated*clocks*can be determined by reading out directly through the NMR spectra. ... Marriage of*quantum*mechanics*with*other traditional science and technology has also produced fruitful results.*Clock**synchronization*is*one*such example. ...
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