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Quantum Clock Synchronization with one qubit [article]

Chris Harrelson, Iordanis Kerenidis
2001 arXiv   pre-print
Chuang's 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.  ... 
arXiv:cs/0103021v3 fatcat:lyeu3b5xzje4dcaejlv6gnr5eu

Quantum methods for clock synchronization: Beating the standard quantum limit without entanglement

Mark de Burgh, Stephen D. Bartlett
2005 Physical Review A. Atomic, Molecular, and Optical Physics  
We introduce methods for 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.  ... 
doi:10.1103/physreva.72.042301 fatcat:z3npcqkoojdqliurncy44b5xsu

Optimized multiparty quantum clock synchronization

Radel Ben-Av, Iaakov Exman
2011 Physical Review A. Atomic, Molecular, and Optical Physics  
A multi-party protocol for distributed 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.  ... 
doi:10.1103/physreva.84.014301 fatcat:hevgq6a5z5b4xhezyou6vbvx4u

Quantum Algorithm for Distributed Clock Synchronization

Isaac L. Chuang
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.  ... 
doi:10.1103/physrevlett.85.2006 pmid:10970669 fatcat:earpi6qtvjc4de5ldanqa6m5vu

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

Yuchen Yang, Zhongtao Shen, Xing Zhu, Ziqi Wang, Gengyan Zhang, Jingwei Zhou, Xun Jiang, Chunqing Deng, Shubin Liu
2022 arXiv   pre-print
The system supports 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.  ... 
arXiv:2110.07965v4 fatcat:necrymeghvgqtdekvttjundwfa

FPGA-based electronic system for the control and readout of superconducting quantum processors

Yuchen Yang, Zhongtao Shen, Xing Zhu, Ziqi Wang, Gengyan Zhang, Jingwei Zhou, Xun Jiang, Chunqing Deng, Shubin Liu
2022 Review of Scientific Instruments  
The system supports 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.  ... 
doi:10.1063/5.0085467 pmid:35922305 fatcat:3qqi5pes4zethjxsgbw3vej274

Entangled quantum clocks for measuring proper-time difference

W. Y. Hwang, D. Ahn, S. W. Hwang, Y. D. Han
2002 European Physical Journal D : Atomic, Molecular and Optical Physics  
We report that entangled pairs of 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  ... 
doi:10.1140/epjd/e20020065 fatcat:3it2sfrclfectcuz53fdn2mcce

Operation-triggered quantum clock synchronization

Jie-Dong Yue, Yu-Ran Zhang, Heng Fan
2015 Physical Review A. Atomic, Molecular, and Optical Physics  
We present a novel 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.  ... 
doi:10.1103/physreva.92.032321 fatcat:4muqm74e6zhp7phc73h6fgigca

Quantum clock synchronization: Multiparty protocol

Marko Krčo, Prabasaj Paul
2002 Physical Review A. Atomic, Molecular, and Optical Physics  
We present a multi-party 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.  ... 
doi:10.1103/physreva.66.024305 fatcat:ewjxzzjmufbdpcfdtfz2lytzde

Quantum clock synchronization and quantum error correction [article]

John Preskill
2000 arXiv   pre-print
This paper is based 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.  ... 
arXiv:quant-ph/0010098v1 fatcat:77ulvp5xbfadhcwflvczfrfeom

Criterion for remote clock synchronization with Heisenberg-scaling accuracy

Yong-Liang Zhang, Yu-Ran Zhang, Liang-Zhu Mu, Heng Fan
2013 Physical Review A. Atomic, Molecular, and Optical Physics  
We propose a 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.  ... 
doi:10.1103/physreva.88.052314 fatcat:r3qfty5b3veaxiyyqkijja3pae

On decoherence in quantum clock synchronization

S. Boixo, C. M. Caves, A. Datta, A. Shaji
2006 Laser physics  
We study two 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.  ... 
doi:10.1134/s1054660x06110065 fatcat:hg2x5obrujdklbf7tsmt7u4ryq

Clock synchronization using maximal multipartite entanglement

Changliang Ren, Holger F. Hofmann
2012 Physical Review A. Atomic, Molecular, and Optical Physics  
We propose a multi party 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.  ... 
doi:10.1103/physreva.86.014301 fatcat:byi7cpz3lfbufbpukoj6gmzi4e

Quantum Clock Synchronization Based on Shared Prior Entanglement

Richard Jozsa, Daniel S. Abrams, Jonathan P. Dowling, Colin P. Williams
2000 Physical Review Letters  
We demonstrate that two spatially separated parties (Alice and Bob) can utilize shared prior 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  ... 
doi:10.1103/physrevlett.85.2010 pmid:10970670 fatcat:coyhccn75fea3h5mzpaf6p7e6i

Nuclear magnetic resonance implementation of a quantum clock synchronization algorithm

Jingfu Zhang, Gui Lu Long, Zhiwei Deng, Wenzhang Liu, Zhiheng Lu
2004 Physical Review A. Atomic, Molecular, and Optical Physics  
The 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.  ... 
doi:10.1103/physreva.70.062322 fatcat:bl5laqebgzcbxbd3atoozoqxha
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