Quantum Metrology with Entangled Coherent States

Joo, Jaewoo; Munro, William J.; Spiller, Timothy P.

doi:10.1103/physrevlett.107.083601

Cited by 463 publications

(257 citation statements)

References 50 publications

Supporting

Mentioning

254

Contrasting

Order By: Relevance

“…[104][105][106][107][108][109] In parallel, studies on how to use quantum phenomena in metrology and sensing emerged, aiming to reach sensitivities beyond the limit imposed by classical physics. [110,111] While discussions continue on the ultimate limit of quantum sensing, [112][113][114][115][116] the use of single-electron spins Figure 4. SEM image of the single phosphorus spin qubit device developed at UNSW.…”

Section: Diamond Quantum Sensingmentioning

confidence: 99%

Isotope engineering of silicon and diamond for quantum computing and sensing applications

2014

View full text Add to dashboard Cite

Some of the stable isotopes of silicon and carbon have zero nuclear spin, whereas many of the other elements that constitute semiconductors consist entirely of stable isotopes that have nuclear spins. Silicon and diamond crystals composed of nuclear-spin-free stable isotopes ( 28 Si, 30 Si, or 12 C) are considered to be ideal host matrixes to place spin quantum bits (qubits) for quantum-computing and -sensing applications, because their coherent properties are not disrupted thanks to the absence of host nuclear spins. The present paper describes the state-of-theart and future perspective of silicon and diamond isotope engineering for development of quantum information-processing devices.

show abstract

Section: Diamond Quantum Sensingmentioning

confidence: 99%

Isotope engineering of silicon and diamond for quantum computing and sensing applications

2014

View full text Add to dashboard Cite

show abstract

“…The quantum Fisher information (QFI), which quantifies a state's ability to measure a phase φ, for a general density matrix ρ, is given by [32][33][34] …”

Section: No Loss: Superposition States Are Sufficientmentioning

confidence: 99%

Effect of multimode entanglement on lossy optical quantum metrology

et al. 2014

View full text Add to dashboard Cite

In optical interferometry multimode entanglement is often assumed to be the driving force behind quantum enhanced measurements. Recent work has shown this assumption to be false: single-mode quantum states perform just as well as their multimode entangled counterparts. We go beyond this to show that when photon losses occur, an inevitability in any realistic system, multimode entanglement is actually detrimental to obtaining quantum enhanced measurements. We specifically apply this idea to a superposition of coherent states, demonstrating that these states show a robustness to loss that allows them to significantly outperform their competitors in realistic systems. A practically viable measurement scheme is then presented that allows measurements close to the theoretical bound, even with loss. These results promote an alternate way of approaching optical quantum metrology using single-mode states that we expect to have great implications for the future.

show abstract

“…Our analysis is in good agreement with the experimental results. This method may enable the continuous deterministic entanglement of two light beams for measurements below the standard quantum limit [27,28], the nondestructive detection of individual photons by measuring cavity reflection instead of transmission [22], the imprinting of large photon-photon phase shifts [1,29] by conducting the same experiment away from atomic resonance, and the production of polarization entangled states by extension to another internal state [30,31]. The experimental system [14] is shown in Fig.…”

mentioning

confidence: 99%

Cross Modulation of Two Laser Beams at the Individual-Photon Level

et al. 2014

View full text Add to dashboard Cite

Deterministic photon-photon interactions are a long-standing goal in optical science. Using an atomic ensemble inside a cavity, we demonstrate the mutual cross modulation of two continuous light beams at the level of individual photons. The originally uncorrelated beams derived from independent lasers become anticorrelated, as evidenced by an equal-time cross-correlation function g ð2Þ ¼ 0.89ð1Þ, showing that one photon in one beam extinguishes a photon in the other beam with a probability of 11(1)%. With further technical improvements, our approach should enable the nondestructive continuous detection of traveling optical photons.

show abstract

Quantum Metrology with Entangled Coherent States

Cited by 463 publications

References 50 publications

Isotope engineering of silicon and diamond for quantum computing and sensing applications

Isotope engineering of silicon and diamond for quantum computing and sensing applications

Effect of multimode entanglement on lossy optical quantum metrology

Cross Modulation of Two Laser Beams at the Individual-Photon Level

Contact Info

Product

Resources

About