Which term refers to the strong information correlation between qubits?

Enjoy more free content and benefits by creating an account Saving articles to read later requires an IEEE Spectrum account The Institute content is only available for members Downloading full PDF issues is exclusive for IEEE Members Access to Spectrum's Digital Edition is exclusive for IEEE Members Following topics is a feature exclusive for IEEE Members Adding your response to an article requires an IEEE Spectrum account Create an account to access more content and features on IEEE Spectrum, including the ability to save articles to read later, download Spectrum Collections, and participate in conversations with readers and editors. For more exclusive content and features, consider Join the world’s largest professional organization devoted to engineering and applied sciences and get access to all of Spectrum’s articles, archives, PDF downloads, and other benefits. When pushed to explain why quantum computers can outspeed classical computers, stories about entangled such that they depend on one another. If more detail is needed, the reader is told that entanglement links qubits no matter how far apart they are—so long as the qubits are “coherent.” For the reader, things are far from coherent. Sure, entanglement is an important aspect of quantum computing. But what exactly is it? In a few words, entanglement is when multiple objects—such as a pair of electrons or photons—share a single quantum state. Like threads in a tangle of yarn, entangled objects cannot be described a...

Most works on open quantum systems generally focus on the reduced physical system by tracing out the environment degrees of freedom. Here we show that the qubit distributions with the environment are essential for a thorough analysis and demonstrate that the way that quantum correlations are distributed in a quantum register is constrained by the way in which each subsystem gets correlated with the environment. For a two-qubit system coupled to a common dissipative environment , we show how to optimise interqubit correlations and entanglement via a quantification of the qubit-environment information flow, in a process that, perhaps surprisingly, does not rely on the knowledge of the state of the environment. To illustrate our findings, we consider an optically-driven bipartite interacting qubit AB system under the action of . By tailoring the light-matter interaction, a relationship between the qubits early stage disentanglement and the qubit-environment entanglement distribution is found. We also show that, under suitable initial conditions, the qubits energy asymmetry allows the identification of physical scenarios whereby qubit-qubit entanglement minima coincide with the extrema of the and entanglement oscillations. The quantum properties of physical systems have been studied for many years as crucial resources for quantum processing tasks and quantum information protocols Many works devoted to the study of entanglement and correlations dynamics in open quantum systems ...

• العربية • Aragonés • বাংলা • Bân-lâm-gú • Български • Bosanski • Català • Čeština • Deutsch • Eesti • Ελληνικά • Español • Esperanto • فارسی • Français • Gaeilge • 한국어 • Bahasa Indonesia • Italiano • עברית • ქართული • Magyar • മലയാളം • Bahasa Melayu • Nederlands • 日本語 • Norsk bokmål • Polski • Português • Română • Русский • Shqip • Simple English • Slovenščina • Suomi • Svenska • Tagalog • ไทย • Türkçe • Українська • Tiếng Việt • 吴语 • 中文 • v • t • e In qubit ( ˈ k juː b ɪ t/) or quantum bit is a basic unit of Etymology [ ] The coining of the term qubit is attributed to qubit was created in jest during a conversation with Bit versus qubit [ ] A In classical computer technologies, a processed bit is implemented by one of two levels of low There are two possible outcomes for the measurement of a qubit—usually taken to have the value "0" and "1", like a bit or binary digit. However, whereas the state of a bit can only be either 0 or 1, the general state of a qubit according to quantum mechanics can be a For a system of n components, a complete description of its state in classical physics requires only n bits, whereas in quantum physics a system of n qubits requires 2 n n-dimensional [ clarification needed] Standard representation [ ] In quantum mechanics, the general | 0 ⟩ = [ 1 0 ] is for example responsible for Bloch sphere representation [ ] | ψ ⟩ = α | 0 ⟩ + β | 1 ⟩ , . Mixed state [ ] Main article: A pure state is fully specified by a single ket, | ψ ⟩ = α | 0 ⟩ + β ...

• Perspective • 07 July 2020 Exploiting chemistry and molecular systems for quantum information science • ORCID: orcid.org/0000-0003-2920-5440 • • ORCID: orcid.org/0000-0003-0945-1492 • • • • • ORCID: orcid.org/0000-0002-2579-8835 • • • ORCID: orcid.org/0000-0002-1479-3318 • • • • ORCID: orcid.org/0000-0003-4255-9550 • … • Show authors Nature Reviews Chemistry volume 4, pages 490–504 ( 2020) The power of chemistry to prepare new molecules and materials has driven the quest for new approaches to solve problems having global societal impact, such as in renewable energy, healthcare and information science. In the latter case, the intrinsic quantum nature of the electronic, nuclear and spin degrees of freedom in molecules offers intriguing new possibilities to advance the emerging field of quantum information science. In this Perspective, which resulted from discussions by the co-authors at a US Department of Energy workshop held in November 2018, we discuss how chemical systems and reactions can impact quantum computing, communication and sensing. Hierarchical molecular design and synthesis, from small molecules to supramolecular assemblies, combined with new spectroscopic probes of quantum coherence and theoretical modelling of complex systems, offer a broad range of possibilities to realize practical quantum information science applications. Open Access articles citing this article. • • Gheorghe Taran • , Eufemio Moreno-Pineda • … Wolfgang Wernsdorfer Nature Communications ...

By • What is qubit (short for quantum bit)? A qubit (short for quantum bit) is the basic unit of information in In a quantum computer, a number of elemental particles such as Quantum computing uses the nature of subatomic particles to execute calculations as an alternative to the electrical signals used in classical computing. Qubit and superposition When used as a qubit, a particle is placed in a controlled environment that protects it from outside influences. For example, it might be floated in a Researchers are experimenting with a variety of approaches to creating an environment in which the qubits can be reliably manipulated and measured without being affected by outside factors. For example, one approach is to suspend an electron in an electromagnetic field and control the electron's spin state, while isolating the electron from external influences. When the electron's spin is aligned with the field, it is in a spin-up state. When it is opposite to the electromagnetic field, it is in a spin-down state. The electron's spin can be changed from one state to another by directing a pulse of energy at the particle. The energy might come from a Suppose that the energy pulse delivered to the electron is 1 unit of energy. What happens if the pulse is only one-half a unit of energy? According to quantum law, the particle enters a state of The superposition property enables a quantum computer to be in multiple states at once. The number of possible states grows exponentially as...

Decoherence of a two-qubit system is studied when each qubit interacts with a Markovian environment in an indefinite way. It is assumed that which environment of the two interacts with each qubit is determined by a controller qubit. This leads to indefiniteness of the environments. When information conveyed by the controller qubit is discarded, the quantum channel of the two qubits is given by a statistical mixture of the two Markovian channels. When appropriate projective measurement is performed on the controller qubit, it is found that the indefiniteness of the two environments significantly affects the output state of the two qubits. Once a specific measurement outcome is obtained, the output state becomes the Bell singlet state even if an initial state of the two qubit has no quantum correlation. Even when the measurement yields the other outcome, the entanglement, the Bell-inequality violation and the quantum discord can be enhanced. • Previous article in issue • Next article in issue • About ScienceDirect • Remote access • Shopping cart • Advertise • Contact and support • Terms and conditions • Privacy policy We use cookies to help provide and enhance our service and tailor content and ads. By continuing you agree to the use of cookies. Copyright © 2023 Elsevier B.V. or its licensors or contributors. ScienceDirect® is a registered trademark of Elsevier B.V. ScienceDirect® is a registered trademark of Elsevier B.V.

Superconducting qubits are a leading candidate for quantum computing but display temporal fluctuations in their energy relaxation times T 1. This introduces instabilities in multi-qubit device performance. Furthermore, autocorrelation in these time fluctuations introduces challenges for obtaining representative measures of T 1 for process optimization and device screening. These T 1 fluctuations are often attributed to time varying coupling of the qubit to defects, putative two level systems (TLSs). In this work, we develop a technique to probe the spectral and temporal dynamics of T 1 in single junction transmons by repeated T 1 measurements in the frequency vicinity of the bare qubit transition, via the AC-Stark effect. Across 10 qubits, we observe strong correlations between the mean T 1 averaged over approximately nine months and a snapshot of an equally weighted T 1 average over the Stark shifted frequency range. These observations are suggestive of an ergodic-like spectral diffusion of TLSs dominating T 1, and offer a promising path to more rapid T 1 characterization for device screening and process optimization. Superconducting qubits are a leading platform for quantum computing f α) in their energy relaxation times T 1 The fluctuations of qubit T 1 are often attributed to resonant couplings with two-level systems (TLSs) that have been historically studied in the context of amorphous solids T 1 in flux and stress tunable devices T 1 over time is explained Furthermor...

• العربية • Aragonés • বাংলা • Bân-lâm-gú • Български • Bosanski • Català • Čeština • Deutsch • Eesti • Ελληνικά • Español • Esperanto • فارسی • Français • Gaeilge • 한국어 • Bahasa Indonesia • Italiano • עברית • ქართული • Magyar • മലയാളം • Bahasa Melayu • Nederlands • 日本語 • Norsk bokmål • Polski • Português • Română • Русский • Shqip • Simple English • Slovenščina • Suomi • Svenska • Tagalog • ไทย • Türkçe • Українська • Tiếng Việt • 吴语 • 中文 • v • t • e In qubit ( ˈ k juː b ɪ t/) or quantum bit is a basic unit of Etymology [ ] The coining of the term qubit is attributed to qubit was created in jest during a conversation with Bit versus qubit [ ] A In classical computer technologies, a processed bit is implemented by one of two levels of low There are two possible outcomes for the measurement of a qubit—usually taken to have the value "0" and "1", like a bit or binary digit. However, whereas the state of a bit can only be either 0 or 1, the general state of a qubit according to quantum mechanics can be a For a system of n components, a complete description of its state in classical physics requires only n bits, whereas in quantum physics a system of n qubits requires 2 n n-dimensional [ clarification needed] Standard representation [ ] In quantum mechanics, the general | 0 ⟩ = [ 1 0 ] is for example responsible for Bloch sphere representation [ ] | ψ ⟩ = α | 0 ⟩ + β | 1 ⟩ , . Mixed state [ ] Main article: A pure state is fully specified by a single ket, | ψ ⟩ = α | 0 ⟩ + β ...

Enjoy more free content and benefits by creating an account Saving articles to read later requires an IEEE Spectrum account The Institute content is only available for members Downloading full PDF issues is exclusive for IEEE Members Access to Spectrum's Digital Edition is exclusive for IEEE Members Following topics is a feature exclusive for IEEE Members Adding your response to an article requires an IEEE Spectrum account Create an account to access more content and features on IEEE Spectrum, including the ability to save articles to read later, download Spectrum Collections, and participate in conversations with readers and editors. For more exclusive content and features, consider Join the world’s largest professional organization devoted to engineering and applied sciences and get access to all of Spectrum’s articles, archives, PDF downloads, and other benefits. When pushed to explain why quantum computers can outspeed classical computers, stories about entangled such that they depend on one another. If more detail is needed, the reader is told that entanglement links qubits no matter how far apart they are—so long as the qubits are “coherent.” For the reader, things are far from coherent. Sure, entanglement is an important aspect of quantum computing. But what exactly is it? In a few words, entanglement is when multiple objects—such as a pair of electrons or photons—share a single quantum state. Like threads in a tangle of yarn, entangled objects cannot be described a...

• Perspective • 07 July 2020 Exploiting chemistry and molecular systems for quantum information science • ORCID: orcid.org/0000-0003-2920-5440 • • ORCID: orcid.org/0000-0003-0945-1492 • • • • • ORCID: orcid.org/0000-0002-2579-8835 • • • ORCID: orcid.org/0000-0002-1479-3318 • • • • ORCID: orcid.org/0000-0003-4255-9550 • … • Show authors Nature Reviews Chemistry volume 4, pages 490–504 ( 2020) The power of chemistry to prepare new molecules and materials has driven the quest for new approaches to solve problems having global societal impact, such as in renewable energy, healthcare and information science. In the latter case, the intrinsic quantum nature of the electronic, nuclear and spin degrees of freedom in molecules offers intriguing new possibilities to advance the emerging field of quantum information science. In this Perspective, which resulted from discussions by the co-authors at a US Department of Energy workshop held in November 2018, we discuss how chemical systems and reactions can impact quantum computing, communication and sensing. Hierarchical molecular design and synthesis, from small molecules to supramolecular assemblies, combined with new spectroscopic probes of quantum coherence and theoretical modelling of complex systems, offer a broad range of possibilities to realize practical quantum information science applications. Open Access articles citing this article. • • Gheorghe Taran • , Eufemio Moreno-Pineda • … Wolfgang Wernsdorfer Nature Communications ...