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':"";if(a){var r=n.promos.showYahooLogo?"":"yns-no-logo";a=a.replace("{notifOnboardBtnLabel}",n.promos.notifOnboardBtnLabel).replace("{notifOnboardMsg}",n.promos.notifOnboardMsg).replace("{subscriptionTopic}",n.promos.subscriptionTopic).replace("{noLogoClass}",r).replace("{promoLogo}",n.promos.promoLogo)}var s=t.newCount>n.panel.maxCount?t.newCount:"",c=n.panel.notificationCenterPath,l=c?"":P,u=n.panel.headerMsg?"":" "+P,d=c?R:"",p=void 0;t.count?p=t.markup:p='{emptyPanelMsg}'.replace("{emptyPanelMsg}",n.panel.emptyPanelMsg);return e=e.replace("{notifMarkup}",p).replace("{promoMarkup}",a).replace("{hideClass}",l).replace("{notifCenterLink}",c).replace("{paddingClass}",d).replace("{headerMsg}",n.panel.headerMsg).replace("{hideHeaderClass}",u).replace(/{notificationCenterNavMsg}/g,n.panel.notificationCenterNavMsg).replace(/{newCount}/g,s)}},{key:"render",value:function(e,t){var n=this;if(n._panelNode){var o=void 0,i=n._panelNode,a=void 0,r=void 0;switch(e){case"expanded_panel":o='{promoMarkup}{notifMarkup}',r=n._store.getNotifications(),a=n._generatePanelMarkup(o,r),i.innerHTML=a;break;case"error_panel":a=(o='{errorMsg}').replace("{errorMsg}",n._config.panel.errorMsg),i.innerHTML=a}t&&t()}else t&&t(new Error("No panel parent"))}},{key:"createPanelParentNode",value:function(e){e&&(e.innerHTML='',this._panelNode=document.getElementById(D))}},{key:"updateBadgeNode",value:function(e){if(e){var t=this._store.getNotifications().newCount,n=this._config.badge.maxCount;if(t){var o=t>n?n+"+":t;e.innerHTML=o}else e.innerHTML=""}}},{key:"addStyles",value:function(e){if(e&&"undefined"!=typeof window){var t=document.getElementById(this._config.panel.styleTagId);t||((t=document.createElement("style")).type="text/css",t.id=this._config.panel.styleTagId,t.innerText=e,document.head.appendChild(t))}}}]),e}(),U=function(){function e(t,n,o){L(this,e);var i=this;i._store=n,i._view=o,i._config=t;var 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Gt(e,o.submitSearchBtn,m(m({},Kt),{label:null!==(t=n.i18n.root.SEARCH_TOOLTIP_WEB)&&void 0!==t?t:"Search the web",containerClass:"".concat(jt.tooltip," ").concat(jt.tooltip__web),tooltipParentElm:o.clearSearchBtn.parentElement}))}));var Jt="_yb_tdk4ba",Vt="_yb_hkd17a",$t="_yb_rtzclf",Xt="_yb_tdbhj6",Zt="_yb_de52ef",Qt="_yb_9hwrey",en="_yb_slc8ta",tn="_yb_bf0svp",nn="_yb_hjic9z";be("ybar-mod-adaptivenav",(function(e){var t=document.querySelector("#ybar-l1-more-menu ul"),n={moreDropDown:document.querySelector(".".concat(Jt)),moreBtn:document.querySelector(".".concat(Vt)),wrap:document.querySelector(".".concat(Xt)),moreSectionTitle:document.querySelectorAll(".".concat(Zt)),editionsCtaBtn:document.querySelector(".".concat(Qt)),editionsMenu:document.querySelector(".".concat(en)),closeBtn:document.querySelector(".".concat(tn)),moreMenuDropDownHeight:t?"".concat(t.offsetHeight+48,"px"):"0"};new 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the valuation levels for these businesses are not only abnormally high, but unsustainable.These 10 stocks could mint the next wave of millionaires ›Last summer, companies such as IonQ (NYSE: IONQ), Rigetti Computing (NASDAQ: RGTI), D-Wave Quantum (NYSE: QBTS), and Quantum Computing (NASDAQ: QUBT) were unknown penny stocks.However, as quantum computing steadily made its way toward center stage in the artificial intelligence (AI) realm, each of these companies witnessed meteoric rises in their share prices. Over the last 12 months, IonQ stock has blasted higher by 517%, while Rigetti, D-Wave, and Quantum Computing have experienced surges of at least 1,500% as of this writing (July 21).With valuations reaching historically high levels, could investors be on the verge of witnessing a quantum computing bubble bursting?The chart below illustrates valuation trends among popular quantum computing stocks on a price-to-sales (P/S) basis.IONQ PS Ratio data by YCharts.As I outlined in a prior article, the quantum computing stocks above are trading at far higher P/S multiples compared to levels seen during the dot-com and COVID-19 stock bubbles.For example, during the internet boom in the late 1990s, stocks such as Amazon, Cisco, and Microsoft experienced peak P/S ratios in the range of 30x and 40x. Taking this a step further, popular COVID stocks such as Zoom Communications and Peloton saw P/S multiples top out at 124x and 20x, respectively.The big theme here is that IonQ, Rigetti, D-Wave, and Quantum Computing are each trading for valuation multiples that could be seen as historically high, even when compared to prior bubble events.With that said, other AI companies that are also exploring quantum computing -- such as Nvidia, Amazon, Alphabet, and Microsoft -- currently trade for much more reasonable valuation multiples when compared to the companies in the chart above.For this reason, I do not think the entire quantum computing landscape is at risk of experiencing a bubble-bursting event. However, IonQ and its peers have been dropping some breadcrumbs in recent months that lead me to think the smaller quantum computing players could be on the verge of a harsh sell-off.Image source: Getty Images.After some digging into certain filings with the Securities and Exchange Commission (SEC), I think IonQ, Rigetti, D-Wave, and Quantum Computing may be trying to signal some important things to investors:Terms and Privacy PolicyPrivacy & Cookie SettingsMore InfoS&P Futures6,449.00 +24.00 (+0.37%)Dow Futures45,230.00 +146.00 (+0.32%)Nasdaq Futures23,548.50 +127.25 (+0.54%)Russell 2000 Futures2,286.00 +14.70 (+0.65%)VIX15.15 +0.22 (+1.47%)Gold3,340.60 +5.00 (+0.15%)PortfolioSign in to access your portfolioSign inTop gainersFIX Comfort Systems USA, Inc. 688.74 +125.91 (+22.37%)LYEL Lyell Immunopharma, Inc. 12.42 +2.01 (+19.31%)GNTX Gentex Corporation 27.42 +3.82 (+16.19%)NEGG Newegg Commerce, Inc. 34.31 +3.60 (+11.72%)DECK Deckers Outdoor Corporation 116.85 +11.91 (+11.35%)Top losersLBRDA Liberty Broadband Corporation 70.06 -16.58 (-19.14%)LBRDK Liberty Broadband Corporation 70.22 -16.53 (-19.05%)CHTR Charter Communications, Inc. 309.75 -70.25 (-18.49%)SNV Synovus Financial Corp. 49.61 -7.11 (-12.54%)PNFP Pinnacle Financial Partners, Inc. 91.56 -12.60 (-12.10%)Most activeINTC Intel Corporation 20.70 -1.93 (-8.53%)TSLA Tesla, Inc. 316.06 +10.76 (+3.52%)NVDA NVIDIA Corporation 173.50 -0.24 (-0.14%)LCID Lucid Group, Inc. 2.9200 -0.0700 (-2.34%)WBD Warner Bros. 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